CN1898575A - Method and device for estimating remaining life of coil - Google Patents

Abstract

The method for estimating the remaining life of a coil according to the present invention includes: a step 1 of confirming whether or not cooling water from a conductor leaks into an insulating layer, and estimating the insulation breakdown voltage of a coil by performing measurement necessary for estimating the insulation breakdown voltage of the coil when the cooling water leaks into the insulating layer; a step 2 of nondestructively estimating a future decrease curve of the insulation breakdown voltage of the coil based on the future operating conditions of the coil; and a 3 rd step of extrapolating the data obtained in the 1 st and 2 nd steps to obtain a time period when the dielectric breakdown voltage falls to a voltage required for operating the coil. According to the above method, it is possible to provide a remaining life estimating method for estimating a remaining life of a coil having an internal electrode mounted in an insulating layer, by estimating a dielectric breakdown voltage of the insulating layer nondestructively without extracting the coil, and estimating the remaining life from the estimated dielectric breakdown voltage.

Description

The residual life presuming method of coil and the residual life estimating device of coil

Technical field

The present invention relates to a kind of in the process of utilizing the direct cooling conductor of chilled water to turn round chilled water leak and be immersed under the situation of insulation course from conductor, the coil life-span presuming method and the coil life-span estimating device in the life-span of prediction coil.

Background technology

When the capacity of electric rotating machine became big, (stator winding) electrorheological that flows into stator coil was big, and along with electric current increases, the joule loss that produces in fixed coil makes temperature too high, is difficult to carry out steady running.

For this reason, for nearest high capacity electric rotating machine, majority has adopted directly supplies with the type that chilled water cools off to stator coil, and Figure 33 shows this structure.

Existing high capacity electric rotating machine makes lower coil 2b and last coil 2a break-through in each groove towards with the radial direction central part side of the stator core 1 of cylindric formation and groove is set.

Wire rod as last coil 2a and lower coil 2b, use hollow straight angle copper wire or use in hollow straight angle copper cash, to mix hollow rectangular wire separately and be used as conductor 3a, 3b, the section of conductor 3a, 3b is formed rectangle, insulation course 4a, 4b are arranged in its outer side covers.

In addition, among last coil 2a and the lower coil 2b,, between hollow bonding conductor 6 jockey 5a, 5b, use the direct cooling conductor 3a of chilled water, the 3b such as for example deionized water that supply with from insulation connecting pipe 7 at the end of conductor 3a, 3b brazing jig 5a, 5b.

Simultaneously, when the high capacity electric rotating machine turned round all the year round, the soldering of conductor 3a, 3b and anchor clamps 5a, 5b part produced deterioration because of corrosion, thereby vacates fine hole, and chilled water leaks into insulation course 4a, 4b, causes the insulation breakdown of coil 2 through regular meeting.

Insulation breakdown for coil 2, because by insulation course 4a, 4b covers conductor 3a, 3b and anchor clamps 5a, the soldering part of 5b, can not Visual Confirmation, so, at present as confirming that chilled water leaks into insulation course 4a, the means of 4b, at at insulation course 4a, the coil 2 that does not possess internal electrode in the 4b, for example, can use the Japanese documentation spy and open flat 9-331656 communique, Te Kaiping 9-51658 communique, the technology that shows in the Te Kaiping 10-177053 communique, in addition, at at insulation course 4a, possess the coil that internal electrode is arranged in the 4b, for example can use the Japanese documentation spy to be willing to the technology that shows in 2000-126293 number.

These technology are all utilized dexterously because leaking of chilled water makes the technology of phenomenon of the static capacity increase of insulation course 4a, 4b, in this technology, electrode is set on coil, measure the static capacity of conductor 3a, 3b and electrode, when the static capacity of measuring is high, is judged to be chilled water and leaks into insulation course 4a, 4b.

In addition, because these technical operations are easy,, are greatly prized by and in practical operation, implement so leak into the simple and easy means of measurement of insulation course as chilled water.

In addition, in the nearest high capacity electric rotating machine, implement following structure,, internal electrode 8a, 8b, 8g are set in insulation course 9,9a, 9b, 9c, the electric field of coil surface is descended as Figure 33 and shown in Figure 34 as the insulation system of coil.

And in the insulation system of coil, 3 layers that can make internal electrode 8a, 8b, 8g is more than 2 layers or 4 layers, at this, is that example describes with 3 layers internal electrodes.In addition, in the internal electrode, be basic point with conductor 3a, the 3b of coil 2, link to each other with the 1st internal electrode 8a, the 2nd internal electrode 8b towards outside diameter, outermost part links to each other with the 3rd internal electrode 8g.

Go for the insulation system of the coil of nearest high capacity electric rotating machine, using insulation course 9, it is a pair of group coil 2 (2a that 9a～9c covers above coil 2a and lower coil 2b, the outside of conductor 3 2b), and, at insulation course 9, the the 1st～the 3rd internal electrode 8a is set among 9a～9c, 8b, three electrodes of 8g, make the 3rd internal electrode 8g be connected coil 2 (2a, 2b) the outermost conductive formation 10 of straight line portion, with the 1st internal electrode 8a, the 2nd internal electrode 8b carries out the capacity dividing potential drop to the static capacity of insulation course 9a～9c, can suppress the electric field of the insulation course outside surface of coil afterbody less.

In addition, be provided with anchor clamps 5 (5a, 5b) in the end of coil afterbody, these anchor clamps 5 (5a, 5b) possess the insulation connecting pipe 7 with the direct cooling conductor 3 of chilled water (3a, 3b).

In comprising the high capacity electric rotating machine of this loop construction, if suitably use disclosed technology in the above-mentioned patent gazette, allow to promptly judge easily whether chilled water is immersed in the insulation course, also be difficult to know the insulation breakdown voltage of now (during measurement), be difficult to further to know from now on how long during in operable residual life.

Especially, as recently, when electric rotating machine progressively increases capacity, not only guarantee to keep in good repair and preparation, the construction period of transformation etc. elongated, and the importance of residual life technology is also increasing gradually.

For example, open the invention that has just proposed relevant residual life technology in the flat 9-93873 communique the Japanese documentation spy.

Technology in this patent gazette is that the part of the anchor clamps of the end of soldering stator coil and conductor is cut off and taken out, check brazing state, infer the beginning period that chilled water leaks, infer residual life according to the data of the rate of descent of after this insulation breakdown voltage.

In this technology, need to remove the insulation of the coupling part between coil, several coils of sampling indispensably, block the operation that end turn is checked, therefore exist and repair a large amount of activity durations of cost and expense etc. and need the problem improved.

For this reason, wish a kind of technology that can realize with shorter time, still less inferring to the expense non-destructive residual life of coil.

Summary of the invention

In view of this viewpoint the present invention has been proposed, the objective of the invention is to, a kind of coil residual life presuming method and coil residual life estimating device are provided, the coil of the insulation course that leaks from conductor, do not take off coil, infer to non-destructive the insulation breakdown voltage of insulation course,, infer the residual life of coil according to the insulation breakdown voltage of inferring out.

Be used to realize the residual life presuming method of the coil of the present invention of above-mentioned purpose, comprise: the 1st operation, whether affirmation leaks into insulation course from the chilled water of conductor, leak under the situation of insulation course at above-mentioned conductor chilled water, carry out the required measurement of inferring, infer the insulation breakdown voltage of coil the insulation breakdown voltage of coil; The 2nd operation is obtained the temperature of above-mentioned coil and the voltage that applies according to above-mentioned coil operating condition from now on, obtain this coil temperature and the voltage that applies in the decline rate of insulation breakdown voltage of any one caused above-mentioned coil at least; The 3rd operation is extrapolated to the data of obtaining by the 1st operation and the 2nd operation, obtains the period that insulation breakdown voltage drops to the above-mentioned coil required voltage of running.

In addition, be used to realize the residual life presuming method of above-mentioned purpose coil of the present invention, comprise; The 1st operation, whether affirmation leaks into insulation course from the chilled water of conductor, leak under the situation of insulation course at above-mentioned conductor chilled water, in the inferring of the insulation breakdown voltage of coil, carry out repeatedly required measurement, can infer the insulation breakdown voltage of coil at each measuring machine through the time; The 2nd operation is obtained the curve that above-mentioned insulation breakdown voltage changed through the time, and extrapolated above-mentioned through time changing curve, predicts the downtrending of insulation breakdown voltage from now on; The 3rd operation is obtained the above-mentioned period that drops to coil running required voltage through time changing curve.

In addition, in the preferred embodiment of the coil residual life presuming method of the present invention in the viewpoint of above-mentioned two embodiment, the 1st operation of inferring the insulation breakdown voltage of coil is: the conductor to coil applies alternating voltage, outer surface measuring internal electrode current potential at the insulation course on internal electrode top, according to insulation breakdown voltage-internal electrode potential property line illustration of making in advance, obtain the insulation breakdown voltage corresponding with measured internal electrode current potential.

In addition, the 1st operation of inferring the insulation breakdown voltage of coil can apply alternating voltage to the conductor of coil, outer surface measuring internal electrode current potential at the insulation course on internal electrode top, obtain the initial value of the internal electrode current potential of measurement and this internal electrode current potential or be judged as the not ratio of any one in the internal electrode current potential of the above-mentioned coil that insulation course leaks of conductor chilled water, according to the relative initial value ratio characteristic line illustration of insulation breakdown voltage-internal electrode current potential of making in advance, obtain the insulation breakdown voltage corresponding with this ratio of obtaining.

In addition, the 1st operation of inferring the insulation breakdown voltage of coil can apply alternating voltage to the conductor of coil, outer surface measuring internal electrode current potential at the insulation course on internal electrode top, obtain the ratio between the internal electrode current potential of adjacency, according to the insulation breakdown voltage of making in advance-, obtain the insulation breakdown voltage corresponding with this ratio of obtaining in abutting connection with the ratio characteristic line illustration of internal electrode current potential.

In addition, the 1st operation of inferring the insulation breakdown voltage of coil can and be left on the partial insulating layer outside surface of above-mentioned internal electrode at the outside surface of the insulation course that possesses internal electrode and install and measure electrode, measure between this potential electrode and the above-mentioned internal electrode and this potential electrode and leave each dielectric property between the conductor of part of above-mentioned internal electrode, according to insulation breakdown voltage-dielectric property line illustration of making in advance, obtain the insulation breakdown voltage corresponding with measured dielectric property.

In addition, the 1st operation of inferring the insulation breakdown voltage of coil can be from the upper side of internal electrode and leave the potential electrode that the outside surface of each insulation course of conductor upper side of the part of above-mentioned internal electrode is installed, the frequency dependence of measuring media characteristic, and obtain the ratio of the dielectric property of two frequencies, according to the frequency change rate line illustration of the insulation breakdown voltage-dielectric property of making in advance, obtain the insulation breakdown voltage corresponding with this ratio of obtaining.

In addition, the 1st operation of inferring the insulation breakdown voltage of coil can be when any one of the relative initial value ratio characteristic line illustration that uses insulation breakdown voltage-internal electrode potential property line illustration, insulation breakdown voltage-internal electrode current potential, and insulation breakdown voltage-in internal electrode current potential ratio characteristic line illustration obtained insulation breakdown voltage, when the current potential to an internal electrode can obtain under the situation of two insulation breakdown magnitudes of voltage, combined insulation disintegration voltage-dielectric property line illustration judges it is among above-mentioned two insulation breakdown magnitudes of voltage which.

In addition, the 1st operation of inferring the insulation breakdown voltage of coil can work as the relative initial value ratio characteristic line illustration that uses insulation breakdown voltage-internal electrode potential property line illustration, insulation breakdown voltage-internal electrode current potential, and insulation breakdown voltage-in internal electrode current potential ratio characteristic line illustration any one when obtaining insulation breakdown voltage, when obtaining under the situation of two insulation breakdown magnitudes of voltage to an internal electrode current potential, according to the passing of the current potential of former measurement, judge it is in two insulation breakdown magnitudes of voltage which.

In addition, infer the 2nd operation of decline rate of the insulation breakdown voltage of coil, to near the hollow wire rod anchor clamps leave the hole of certain size and do not cause many coils leaking or running in confirm as the coil that leaks the conductor chilled water in the insulation course, make the water that is set in temperature more than 2 kinds remain in water, the circulation of working of going forward side by side in a plurality of conductors with certain hydraulic pressure at each temperature; Under each temperature, immersing different a plurality of moment of degree at water carries out insulation breakdown and tests and obtain insulation breakdown voltage, make insulation breakdown voltage-warm water line illustration cycling time cycling time according to insulation breakdown voltage of obtaining and warm water, and obtain the decline rate of insulation breakdown voltage according to this insulation breakdown voltage-warm water line illustration cycling time, according to the decline rate making expression of the insulation breakdown voltage of obtaining and the A Leiniesitu of the relation of the temperature of recirculated water, obtain the decline rate of the insulation breakdown voltage corresponding according to A Leiniesitu with the arbitrary temp of recirculated water.

In addition, the 2nd operation of decline rate of inferring the insulation breakdown voltage of coil comprises: the A operation, near anchor clamps hollow wire rod is left the aperture of certain size and do not caused many coils that leak, or in the real-world operation coil, confirm as in the insulation course coil that immerses water, make the water that is set in a kind of predetermined temperature in conductor, keep certain hydraulic pressure and circulation, immerse the different a plurality of warm water circulations of degree at water and carry out the insulation breakdown test constantly, obtain insulation breakdown voltage, then, coil is disintegrated, insulation course is taken a sample, measurement in the resin of insulation course because of adding the containing ratio Ga of the chemical specific basic S that water decomposition changes, and obtain rate of change Ka with respect to the insulation breakdown voltage of Ga, and through the pace of change Ua of the Ga of warm water cycling time; The B operation, make the test film of the insulation course that cuts out from complete coil contact the stipulated time with the warm water of temperature more than 2 kinds, after this take out, measure and the of the same race specific basic S containing ratio Gb in test that in above-mentioned A operation, uses, and the temperature of each warm water is obtained pace of change Ub based on the Gb of warm water duration of contact; The C operation, any one is made as logarithm chi axle the pace of change Ub of the containing ratio Gb of specific basic S under a plurality of temperature that obtain in the pace of change Ua of the containing ratio Ga of specific basic S in the insulation course that obtains in above-mentioned A operation and the above-mentioned B operation, temperature is made as in another the curve map, go out to be parallel to the line of latter's regression straight line by 1 point-rendering that obtains by the former, obtain the pace of change Uc of the containing ratio of setting arbitrarily the specific basic S under the temperature; Long-pending as the pace of change Uc of the containing ratio of the rate of change Ka of the insulation breakdown voltage that obtains in above-mentioned A operation and the specific basic S under the set point of temperature that above-mentioned C operation obtains obtained the decline rate of the insulation breakdown voltage under the set point of temperature.

In addition, the 2nd operation of decline rate of inferring the insulation breakdown voltage of coil comprises: the A operation, near anchor clamps hollow wire rod is left the aperture of certain size and do not caused many coils that leak or confirm as in the insulation course coil that immerses water in the real-world operation coil, make the water that is set in a kind of predetermined temperature in conductor, keep certain hydraulic pressure and circulation, immerse the different a plurality of warm water circulations of degree at water and carry out insulation breakdown constantly and test and obtain insulation breakdown voltage; Then coil is disintegrated, and insulation course is taken a sample, measure in the insulation course resin containing ratio Ga because of the specific basic S in the containing ratio Ga that adds the chemical specific basic S that water decomposition changes and the complete insulation course ₀(initial value of the containing ratio of specific basic S), and obtain the containing ratio of specific basic S from the variation delta Ga of initial value (| Ga-Ga ₀|), obtain rate of change Ka, and obtain pace of change Ua through the Δ Ga of warm water cycling time with respect to the insulation breakdown voltage of Δ Ga; The B operation, make the test film of the insulation course that cuts out from complete coil contact the stipulated time with the warm water of temperature more than 2 kinds, after this take out, measure and the variation delta Gb of the containing ratio of of the same race specific basic S in test film that in above-mentioned A operation, uses, the temperature of each warm water is obtained pace of change Ub through the Δ Gb of warm water duration of contact from initial value; The C operation, any one is made as logarithm chi axle to the containing ratio of the specific basic S of the containing ratio of specific basic S in the insulation course that will obtain in above-mentioned A operation under the pace of change Ua of the variation delta Ga of initial value and a plurality of temperature of obtaining in above-mentioned B operation in the pace of change Ub of the variation delta Gb of initial value, temperature is made as in another the curve map, go out to be parallel to the line of latter's regression straight line by 1 point-rendering that obtains by the former, obtain the containing ratio of setting arbitrarily the specific basic S under the temperature pace of change Uc from the variable quantity of initial value; As long-pending from the pace of change Uc of the variable quantity of initial value of the containing ratio of the rate of change Ka of the insulation breakdown voltage that obtains in above-mentioned A operation and the specific basic S under the set point of temperature that above-mentioned C operation obtains, obtain the decline rate of the insulation breakdown voltage under set point of temperature.

In addition, inferring the 2nd operation of decline rate of the insulation breakdown voltage of coil also can use near the hollow wire rod anchor clamps to leave the hole of certain size and do not cause many coils that leak, or on-streamly confirm as the many coils that the conductor chilled water leaks into insulation course, conductor ground connection with these coils, add the voltage of regulation at line part to many coils of this part, to remaining many coils under the state that does not power up, make the warm water that is set in set point of temperature in the conductor of all coils, keep certain hydraulic pressure and water flowing, circulation, immersing different a plurality of moment of degree at water carries out insulation breakdown and tests and obtain insulation breakdown voltage, make insulation breakdown voltage-warm water line illustration cycling time cycling time according to insulation breakdown voltage of being obtained and warm water, and obtain the decline rate of coil that in warm water circulation, powers up and the insulation breakdown voltage that does not power up coil, and obtain the increment rate of the decline rate that powers up the insulation breakdown voltage that causes according to both ratio according to this insulation breakdown voltage-warm water line illustration cycling time.

In addition, the 2nd operation of decline rate of inferring the insulation breakdown voltage of coil also can be to the coil of the equipment of real-world operation, the insulation course outer surface measuring internal electrode current potential on electrode top internally termly, and measure the potential electrode of the coil covering outside surface be arranged on the part of leaving internal electrode and the dielectric property between the conductor, the beginning period that chilled water leaks is held in variation according to these measured values in insulation course, through behind the preset time, extract coil and obtain insulation breakdown voltage; On the other hand, according to begin from chilled water to period that insulation course leaks till extract this coil the duration of runs and do not leak the poor of the presumed value of the insulation breakdown voltage under the chilled water situation and actual insulation breakdown voltage period in the beginning that above-mentioned chilled water leaks to insulation course, obtain the decline rate of the insulation breakdown voltage of coil.

In addition, the 1st operation of inferring the insulation breakdown voltage of coil also can be to having leaked many coils of chilled water, internal electrode current potential according to the outer surface measuring of the upper insulation layer of the nearest electrode of measuring internally before the insulation breakdown test, be arranged between the potential electrode of outside surface of insulation course and conductor and the dielectric property between internal electrode, and the insulation breakdown voltage of after these are measured, measuring, make insulation breakdown voltage-internal electrode potential property line illustration, the relative initial value ratio characteristic line illustration of insulation breakdown voltage-internal electrode current potential, insulation breakdown voltage-in abutting connection with internal electrode current potential ratio characteristic figure, insulation breakdown voltage-in abutting connection with the characteristic line illustration, after this frequency change rate line illustration of insulation breakdown voltage-dielectric property uses these characteristic line illustrations to infer insulation breakdown voltage when measuring.

In addition, according to another viewpoint of the present invention, in the coil residual life estimating device that is provided to achieve these goals, comprise: the noncontact surface potential meter that the current potential of the internal electrode that is provided with in covering the insulation course of coil is measured, and the dielectric characteristic measurement device that any one and the dielectric property between the potential electrode that the coil covering outside surface is installed at least in above-mentioned internal electrode and the conductor are measured; Based on according to the insulation breakdown voltage of inferring out by the current potential of measuring, infer residual life, when above-mentioned insulation course installs and measures electrode, the probe of above-mentioned noncontact surface potential meter is moved along coil, detecting stable surface electrical bit position, above-mentioned potential electrode is installed on the above-mentioned surface of insulating layer.

In addition, according to another viewpoint of the present invention, the coil residual life estimating device that is provided to achieve these goals, comprise: the noncontact surface potential meter that the current potential of the internal electrode that is provided with in covering the insulation course of coil is measured, and the dielectric characteristic measurement device that any one and the dielectric property between the potential electrode that the outside surface of coil covering is installed at least in above-mentioned internal electrode and the conductor are measured; Based on insulation breakdown voltage of obtaining according to the above-mentioned current potential of measuring and above-mentioned dielectric property, infer residual life, above-mentioned dielectric characteristic measurement device is connected the lead-in wire lead-out terminal of measured equipment and any at least end in the neutral terminal with HV Terminal, and low-voltage terminal is connected on the potential electrode of the outside surface that is installed in coil covering.

In addition, according to another viewpoint of the present invention, the coil residual life estimating device that is provided to achieve these goals, comprise: the noncontact surface potential meter that the current potential of the internal electrode that is provided with in covering the insulation course of coil is measured, and the dielectric characteristic measurement device that any one and the dielectric property between the potential electrode that the outside surface of coil covering is installed at least in above-mentioned internal electrode and the conductor are measured; Based on insulation breakdown voltage of obtaining according to the above-mentioned current potential of measuring and above-mentioned dielectric property, infer residual life, above-mentioned dielectric characteristic measurement device is connected to the case that holds above-mentioned coil and any end in the iron core with HV Terminal, and low-voltage terminal is connected on the potential electrode of the outside surface that is installed in coil covering.

The residual life presuming method of the coil of the invention described above, implement by following 3 operations: the 1st operation, whether affirmation leaks into insulation course from the chilled water of conductor, leak under the situation of insulation course at above-mentioned conductor chilled water, carry out the required measurement of inferring, infer the insulation breakdown voltage of coil the insulation breakdown voltage of coil; The 2nd operation according to above-mentioned coil operating condition from now on, is inferred to non-destructive the insulation breakdown voltage decline curve from now on of coil; The 3rd operation is extrapolated to the data of obtaining by the 1st operation and the 2nd operation, obtains the period that insulation breakdown voltage drops to the above-mentioned coil required voltage of running.So can non-destructive ground, simple and easy and easily infer coil residual life from now on, can promptly carry out disposal such as rapid exchange, guarantee for coil.

In addition, the coil residual life estimating device of the invention described above, its structure is: detect the position that is arranged on the internal electrode in the insulation course from the outside surface of the insulation course of coil, it is arranged on the appropriate location of the outside surface of insulation course, and makes dielectric property device and terminal thereof be connected to suitable object part.So can high-precision measuring media characteristic, can infer residual life accurately.

By the following explanation of reference accompanying drawing, will understand more detailed character of the present invention and feature more.

Description of drawings

Fig. 1 is the block diagram of embodiment of the residual life presuming method of expression coil of the present invention.

Fig. 2 is the line illustration that expression is applicable to the insulation breakdown voltage relationship of duration of runs the 1st embodiment, coil of coil residual life presuming method of the present invention and coil.

Fig. 3 is the line illustration that expression is applicable to the insulation breakdown voltage relationship of duration of runs the 2nd embodiment, coil of coil residual life presuming method of the present invention and coil.

Fig. 4 is the synoptic diagram of the insulation breakdown voltage measuring apparatus that is suitable for when being illustrated in the insulation breakdown voltage of inferring coil in the coil life-span presuming method of the present invention.

Fig. 5 is the sectional view that the V-V direction of arrow of coil shown in Figure 4 is cut off.

Fig. 6 is the electric equivalent circuit diagram that is used to calculate the current potential of internal electrode shown in Figure 4.

Fig. 7 be suitable for as the 1st embodiment when inferring insulation breakdown voltage in the 1st operation of residual life presuming method of coil of the present invention, insulation breakdown voltage-internal electrode potential property line illustration.

Fig. 8 be suitable for as the 1st embodiment when inferring insulation breakdown voltage in the 1st operation of residual life presuming method of coil of the present invention, another insulation breakdown voltage-internal electrode potential property line illustration.

Fig. 9 is a relative initial value ratio characteristic line illustration that be suitable for as the 2nd embodiment, insulation breakdown voltage-internal electrode current potential when inferring insulation breakdown voltage in the 1st operation of residual life presuming method of coil of the present invention.

Figure 10 is a relative initial value ratio characteristic line illustration that be suitable for as the 2nd embodiment, another insulation breakdown voltage-internal electrode current potential when inferring insulation breakdown voltage in the 1st operation of residual life presuming method of coil of the present invention.

Figure 11 be suitable for as the 3rd embodiment when inferring insulation breakdown voltage in the 1st operation of residual life presuming method of coil of the present invention, another insulation breakdown voltage-in abutting connection with internal electrode current potential ratio characteristic line illustration.

Figure 12 be suitable for as the 4th embodiment when inferring insulation breakdown voltage in the 1st operation of residual life presuming method of coil of the present invention, another insulation breakdown voltage-dielectric property line illustration.

Figure 13 is as the frequency characteristic line illustration of the 5th embodiment static capacity that be suitable for, insulation course when inferring insulation breakdown voltage in the 1st operation of residual life presuming method of coil of the present invention.

Figure 14 is as the long-pending frequency characteristic line illustration of the 5th embodiment static capacity that be suitable for, insulation course and static tangent when inferring insulation breakdown voltage in the 1st operation of residual life presuming method of coil of the present invention.

Figure 15 be the 1kHz of 3 kinds of dielectric properties that be suitable for as the 5th embodiment, the expression insulation course when inferring insulation breakdown voltage in the 1st operation of residual life presuming method of coil of the present invention and 10kHz ratio with leak the figure that immerses the relation of ratio to the conductor chilled water of insulation course.

Figure 16 is the frequency change rate line illustration of insulation breakdown voltage-dielectric property of coil that is suitable for as the 5th embodiment when inferring insulation breakdown voltage in the 1st operation of residual life presuming method of coil of the present invention, possessed 2 layers internal electrode.

Figure 17 be suitable for as the 6th embodiment when inferring insulation breakdown voltage in the 1st operation of residual life presuming method of coil of the present invention, edge disintegration voltage-internal electrode potential property line illustration.

Figure 18 be suitable for as the 6th embodiment when inferring insulation breakdown voltage in the 1st operation of residual life presuming method of coil of the present invention, insulation breakdown voltage dielectric loss angle tangent line illustration.

Figure 19 be suitable for as the 7th embodiment when inferring insulation breakdown voltage in the 1st operation of residual life presuming method of coil of the present invention, insulation breakdown voltage-internal electrode potential property line illustration.

That Figure 20 is that the 1st embodiment during as the decline rate of obtaining insulation breakdown voltage is suitable in the 2nd operation of residual life presuming method of coil of the present invention, the warm water cycling time of expression coil and the line illustration of insulation breakdown voltage relationship.

Figure 21 is the line illustration of the decline rate relation of the 1st embodiment temperature that be suitable for, that be illustrated in round-robin warm water in the coil during as the decline rate of obtaining insulation breakdown voltage and insulation breakdown voltage in the 2nd operation of residual life presuming method of coil of the present invention.

That Figure 22 is that the 2nd embodiment during as the decline rate of obtaining insulation breakdown voltage is suitable in the 2nd operation of residual life presuming method of coil of the present invention, expression based on the ester group containing ratio in the insulation course from the variation of initial value and the line illustration of deterioration time relationship.

That Figure 23 is that the 2nd embodiment during as the decline rate of obtaining insulation breakdown voltage is suitable in the 2nd operation of residual life presuming method of coil of the present invention, expression based on the ester group containing ratio in the insulation course from the variation of initial value and the line illustration of insulation breakdown voltage relationship.

The ester group containing ratio in that Figure 24 is that the 2nd embodiment during as the decline rate of obtaining insulation breakdown voltage is suitable in the 2nd operation of residual life presuming method of coil of the present invention, the expression insulation course and the line illustration of pace of change relation.

Figure 25 is the line illustration of the insulation breakdown voltage of the 3rd embodiment duration of runs-coil that be suitable for, the expression coil during as the decline rate of obtaining insulation breakdown voltage in the 2nd operation of residual life presuming method of coil of the present invention.

Figure 26 is the synoptic diagram of the 1st embodiment of the residual life estimating device of expression coil of the present invention.

Figure 27 is the synoptic diagram of the 2nd embodiment of the residual life estimating device of expression coil of the present invention.

Figure 28 is the synoptic diagram of the 3rd embodiment of the residual life estimating device of expression coil of the present invention.

Figure 29 is the synoptic diagram of potential electrode that is applicable to the residual life estimating device of coil of the present invention.

Figure 30 is the front view (FV) from the potential electrode of the XXX-XXX direction observation of Figure 29.

Figure 31 is the synoptic diagram of another potential electrode that is applicable to the residual life estimating device of coil of the present invention.

Figure 32 is the front view (FV) from the potential electrode of the XXXII-XXXII direction observation of Figure 31.

Figure 33 is the partial schematic diagram of the stator coil in the existing motor of expression.

Figure 34 is the partial schematic diagram that has possessed the coil afterbody of internal electrode in the insulation course that is illustrated in the existing generator.

Embodiment

Below, the symbol that marks in quoted figures and the accompanying drawing illustrates the embodiment of the residual life estimating device of the residual life presuming method of coil of the present invention and coil.

And present embodiment is that example describes with the stator coil of high capacity turbogenerator, but is not limited to this example, can be applicable to the but coil of all direct water-cooling that has internal electrode in the insulation course.

Before the explanation of the embodiment of coil residual life presuming method of the present invention, at first quote the insulation system of Fig. 4～Fig. 6 open-wire line circle.

The insulation system that is applicable to the coil of coil residual life presuming method of the present invention constitutes: the conductor 12 that covers the coil 11 that comprises coil and lower coil with insulation course 13 and the 1st～the 3rd insulation course 13a, 13b, 13c, and in insulation course 13 and the 1st～the 3rd insulation course 13a, 13b, 13c, the 1st～the 3rd internal electrode 14a, 14b, 14g are set, outermost the 3rd internal electrode 14g is connected to the conductive formation 15 of coil 11, on the other hand, setting possesses the anchor clamps 17 of the conductor 12 of coil 11 ends being supplied with the insulation connecting pipe 16 of chilled waters.

In addition, be applicable to insulation system such as Fig. 4 and shown in Figure 5 of the coil of coil residual life presuming method of the present invention, encirclement is positioned at the conductor 12 of central portion, between the 1st～the 3rd insulation course 13a, 13b, 13c, be disposed with the 1st～the 3rd internal electrode 14a, 14b, 14g to outside diameter towards its outside diameter from internal side diameter.And, immerse at chilled water under the situation of insulation course, immerse to outer direction from the innermost layer of insulation course.For example, be immersed under the situation midway of insulation course 13a, the 1st insulation course 13a is divided into the arid region 18b that chilled water immersion portion zone 18a and chilled water do not immerse.

Make across conductive formation 15 and to be positioned at outermost the 3rd internal electrode 14g and to be grounded on the iron core (not shown).In addition, the 1st internal electrode 14a and the 2nd internal electrode 14b that are provided with between the 3rd internal electrode 14g and conductor 12 are its floating-potential electrodes of position of end separately that staggers, and decide current potential by the dividing potential drop of static capacity.

In addition, the internal electrode potential test device of the current potential of the internal electrode of measurement coil comprises: the outside surface advance and retreat that make coil 11, determine the position of the 1st～the 3rd internal electrode 14a, 14b, 14g, and measure the potential measurement probe 19 of the current potential of each internal electrode 14a, 14b; From the noncontact surface potential meter 20 of this potential measurement probe 19 by going between and being connected with probe splicing ear 20; And the waveform lead-out terminal 21 of noncontact surface potential meter 20 connects for example voltage measuring apparatus 22 such as alternating voltage meter or oscillograph by lead-in wire since then, is read from AC power 23 by voltage measuring apparatus 22 and is applied to the alternating voltage of conductor 12 and the current potential of exporting from noncontact surface potential meter 20.The phenomenon that the internal electrode current potential rose when this measurement mechanism utilization was immersed any one insulation course among the 1st～the 3rd insulation course 13a, 13b, the 13c when the conductor chilled water detects the immersion of chilled water.

In addition, in coil mounted on surface potential electrode, when the dielectric property between potential electrode and the 1st～the 2nd internal electrode 14a, 14b and the conductor 12 is measured, coil-conductor is applied alternating voltage, as shown in figure 26, along the axial surface measurements current potential on insulation course 13 surfaces, confirm the position of internal electrode, potential electrode 24a, 24b, 24s are set in place, can the little dielectric property of measuring error.

And, be applied to the alternating voltage of conductor 13 from AC power 23, both can be that sine wave also can be square wave, triangular wave alternating voltage.And, consider along with the conductor chilled water to the leakage of the 1st～the 3rd insulation course 13a, 13b, 13c and the moisture absorption that produces, the frequency of alternating voltage is preferably low frequency, for example is preferably below the 100Hz.

Fig. 6 be from the 1st insulation course 13a when the 3rd insulation course 13c immerses leaking of conductor chilled water successively, obtain the equivalent electrical circuit of the 1st～the 3rd internal electrode 14a, 14b, 14g current potential.

In Fig. 6, the static capacity of establishing conductor 12 and the 1st internal electrode 14a is Ca, and the static capacity of establishing the 1st internal electrode 14a and the 2nd internal electrode 12b is Cb, and the static capacity of establishing the 2nd internal electrode 14b and the 3rd internal electrode 14g is Cc.

And, under the immersion scope of chilled water concentrates on situation in the insulation course 13a, between conductor 12 and internal electrode 14a, be provided with the equivalent resistance Ra of the dielectric loss of simulation the 1st insulation course 13a.

In this equivalent circuit, if do not immerse the conductor chilled water to the 1st～the 3rd insulation course 13a, 13b, 13c, then the current potential of each internal electrode 14a, 14b is just determined by the dividing potential drop of the static capacity Ca that applies voltage E, Cb, Cc.

The 1st internal electrode 14a of this moment and each current potential Va, Vb of the 2nd internal electrode 14b represent with following formula:

(mathematical expression 1)

$\mathrm{Va}=\frac{1/\mathrm{Cb}+1/\mathrm{<figure-callout\; id="1"\; label="Cc"\; filenames="A20048003851000491.png,A20048003851000511.png"\; state="\{\{state\}\}">Cc</figure-callout>}}{1/\mathrm{Ca}+1/\mathrm{Cb}+1/C}\&times;E---\left(1\right)$

$\mathrm{Vb}=\frac{1/\mathrm{<figure-callout\; id="1"\; label="Cc"\; filenames="A20048003851000491.png,A20048003851000511.png"\; state="\{\{state\}\}">Cc</figure-callout>}}{1/\mathrm{Ca}+1/\mathrm{Cb}+1/\mathrm{Cc}}\&times;E---\left(2\right)$

Exist under the situation that the conductor chilled water leaks at the 1st insulation course 13a, (relative dielectric constant with respect to chilled water is about 80 because the relative dielectric constant of chilled water is very big, the relative dielectric constant of dry insulation course is about 4.5), increase so leaked the static capacity Ca of the 1st insulation course 13a of conductor chilled water.In addition, owing to compare with insulation course, the conductance of leaking of conductor chilled water is extremely low, so increase dielectric loss significantly.In order to simulate this dielectric loss, between conductor 12 and the 1st internal electrode 14a, equivalent resistance Ra is set.

And, though even also need parallel resistance at static capacity Cb, Cc, if owing to do not have leaking of conductor chilled water, then can be very high, so omit.

For example, each static capacity Ca, Cb, Cc are made as Ca=1200pF, Cb=2000pF, Cc=3000pF, to apply under the situation that 50Hz that voltage E is made as E=100Vrms exchanges, when the 1st insulation course 13a did not have leaking of conductor chilled water, its current potential Va was Va=50.0V according to formula (1) etc.

Then, leaking of conductor chilled water is immersed in the 1st insulation course 13a, static capacity Ca is increased to 3 times, increases to Ca=3600pF particularly, and dielectric loss further increases, dielectric loss angle tangent (tan δ) is increased under 0.2 the situation (under the intact situation, be generally about below 0.01), (calculating formula is omitted because of complicated) becomes Va=75.6V when calculating the current potential Va of the 1st internal electrode 14a, with compare under the intact situation, increase 51%.

The gathering of result of the current potential Vb that comprises the 2nd internal electrode 14b that calculates according to formula (2) has been shown in table 1 in addition.

[table 1]

The state of coil	The current potential Va (V) of the 1st internal electrode a	The current potential Vb (V) of the 2nd internal electrode b	Vb/Va
				Normally	50.0	20.0	0.4
Chilled water immerses	75.6	30.2	0.4
				V (chilled water immersion)/V (normally)	1.51	1.51	-

As shown in Table 1, the current potential of the 2nd internal electrode 14b also increases by 51% because of the conductor leakage of cooling water.

In the case, if chilled water leaks, the current potential of its internal electrode will increase, and meanwhile insulation breakdown voltage also can descend.

Therefore, between the variation of the current potential of internal electrode and insulation breakdown voltage, there is certain correlationship, thinks, just can infer insulation breakdown voltage by the current potential of internal electrode if obtain this correlationship in advance.

Below, illustrate and use coil insulation structure shown in Fig. 4～Fig. 6 and internal electrode potential test device to infer chilled water from the conductor embodiment coil residual life, coil residual life presuming method of the present invention when leaking into insulation course.

Fig. 1 is the block diagram of the embodiment of expression coil residual life presuming method of the present invention.

Constitute the coil residual life presuming method of present embodiment, comprising: (step 1) confirms whether leak into insulation course from the chilled water of conductor, leak at the conductor chilled water under the situation of insulation course, infer the insulation breakdown voltage of coil to the 1st operation; The 2nd operation (step 2), according to by in the coil temperature of above-mentioned coil operating condition prediction from now on and the voltage that applies at least any one, obtain the decline rate of the insulation breakdown voltage of above-mentioned coil; The 3rd operation (extrapolate to the data of obtaining from the 1st operation and the 2nd operation, obtains the period that insulation breakdown voltage drops to coil running required voltage by step 3).

The coil residual life presuming method that comprises the present embodiment of these operations, at first, in the 1st operation (the concrete example aftermentioned of step 1), by surface potential measurement probe measurement internal electrode current potential, under the situation that has the conductor chilled water to leak, use expression to obtain the current potential of internal electrode of insulation breakdown voltage of the coil that the conductor chilled water leaked and the graph of a relation of insulation breakdown voltage in advance, infer out and whether leaked chilled water to insulation course, and this presumed value is depicted as the A point on Fig. 2 from conductor.

Then, in the 2nd operation, at first, obtain the coil temperature of the conditional forecasting of turning round from now on and the voltage that applies according to the link position of coil according to coil.Then, obtain the decline rate of the insulation breakdown voltage in this coil operating condition.

At last, in the 3rd operation,, draw out the line L (extrapolation) of the decline rate of the insulation breakdown voltage of obtaining in the 2nd operation, obtain the period that drops to coil running required voltage E0, promptly reach the B point in period in life-span by the A point of Fig. 2.Then, infer from current point (measure constantly) to time that B is ordered as residual life.

And, though the residual life presuming method of the coil of present embodiment also can be inferred out the insulation breakdown voltage of the coil of conductor chilled water leakage, obtain residual life according to data of inferring, but be not limited thereto example, for example, as shown in Figure 3, in the 1st operation, the insulation breakdown voltage of regularly obtaining the coil of chilled water leakage is A1, A2,, A6 ... in the 2nd operation, obtain the curve that insulation breakdown voltage changed through the time, and, extrapolate this through time changing curve, the downtrending of prediction insulation breakdown voltage from now on, in the 3rd operation, obtain this and drop to the B point in period of coil running required voltage E0 through time changing curve, infer the residual life of coil.

So, because the residual life presuming method of the coil of present embodiment (in the step 1), is inferred insulation breakdown voltage in the 1st operation; In the 2nd operation (step 2), obtain the decline rate of insulation breakdown voltage; In the 3rd operation (in the step 3), the data of obtaining from the 1st operation and the 2nd operation are extrapolated, obtain the residual life (period) that insulation breakdown voltage drops to coil running required voltage, thus just can non-destructive, simple and easy and easily infer out the residual life of coil.

Then, describe the 1st operation (step 1) and the 2nd operation (step 2) in the residual life presuming method of the coil of the present invention shown in Fig. 1 successively in detail.

Fig. 7 and Fig. 8 infer the 1st operation (during insulation breakdown voltage in the step 1), to be applicable to the insulation breakdown voltage-internal electrode potential property line illustration of the 1st embodiment.

And Fig. 7 is the insulation breakdown voltage-internal electrode potential property line illustration that is provided with two (2 layers) internal electrodes in insulation course.In addition, Fig. 8 is the insulation breakdown voltage-internal electrode potential property line illustration that is provided with 3 (3 layers) internal electrodes in insulation course.

Among Fig. 7 and Fig. 8, the initial value of insulation breakdown voltage changes according to the rated voltage of coil and the kind of insulating material etc.After, represent the ratio of insulation breakdown voltage with number percent with respect to initial value.

(in the step 1), the potential measurement probe 19 that Fig. 4 is represented is advanced and retreat in the outside surface of insulation course 13, or makes potential measurement probe 19 measure current potential near potential electrode 24a, 24b, 24s shown in Figure 26 in the 1st operation.

Based on the ratio Va/E, the Vb/E that respectively apply voltage E, can obtain insulation breakdown voltage according to insulation breakdown voltage-internal electrode potential property line illustration of making in advance with respect to the current potential Va that measures (2 layers of internal electrode), Vb (3 layers of internal electrode).

So, present embodiment is owing to make insulation breakdown voltage-internal electrode potential property line illustration in advance with experimental data etc., so can easily obtain insulation breakdown voltage according to the current potential Va, the Vb that measure.

And the current potential of internal electrode can not directly be measured, and measures the current potential of the outside surface of insulation course, because both are approximate values, so for explanation simply, after, be expressed as " measuring the internal electrode current potential " or " internal electrode current potential " etc.

Fig. 9 and Figure 10 are as the 1st operation (insulation breakdown voltage-relative initial value ratio characteristic of internal electrode current potential line illustration that the 2nd embodiment in the step 1) is suitable for.

Because when measuring the internal electrode current potential, the chilled water of supplying with conductor leaks into insulation course and causes that current potential rises, Given this rate of change that rises is important, if obtain in advance with respect to the ratio of the initial value of each internal electrode current potential and the relation of insulation breakdown voltage, then present embodiment just can be inferred insulation breakdown voltage with holding.

Fig. 9 is expression with respect to the relative initial value ratio characteristic line illustration of the insulation breakdown voltage-internal electrode current potential of the ratio of the initial value of the current potential V14a of the coil inside electrode a that comprises two (2 layers) internal electrodes and the relation of insulation breakdown voltage.

In addition, Figure 10 is initial value (the difference Va of expression with respect to current potential Va, the Vb of the coil inside electrode V14a, the V14b that comprise 3 (3 layers) internal electrodes ₀, Vb ₀) ratio and the relative initial value ratio characteristic line illustration of the insulation breakdown voltage-internal electrode current potential of the relation of insulation breakdown voltage.

At this, when coil is made or the starting stage in when running measure initial value Va ₀, Vb ₀, or when the measurement of current potential Va, Vb, measure the initial value Va of a plurality of coils ₀, Vb ₀, obtain and in the distribution of measured value, be judged as normal value.As the latter's instantiation, the simplest method also can adopt the intermediate value of all measurement data.

So, if wait the relative initial value ratio characteristic figure of construction drawing 9 in advance and insulation breakdown voltage-internal electrode current potential shown in Figure 10 by experiment, then can measure the internal electrode current potential, just can obtain escalating rate, and can infer insulation breakdown voltage with respect to initial value.

Figure 11 is as the 1st operation (the insulation breakdown voltage that the 3rd embodiment in the step 1) is suitable for-in abutting connection with internal electrode current potential ratio characteristic line illustration.

Present embodiment is at the coil that comprises 3 (3 layers) above internal electrodes, promptly comprises in the stratiform configuration of the coil of the internal electrode of floating-potential more than 2 layers, if immerse the water that the conductor chilled water leaks between these two internal electrodes, then the ratio of two of adjacency internal electrode current potentials is (when the internal electrode of floating-potential is 2 layers, Vb/Va) be fixed value (with reference to table 1), if immersed the water that the conductor chilled water leaks, the ratio of two internal electrode current potentials that will increase adjacency is (when the internal electrode of floating-potential is 2 layers, Vb/Va).

Obtain the relation of the ratio and the insulation breakdown voltage of these two internal electrode units in advance by experiment, infer insulation breakdown voltage by the ratio of two adjacent internal electrode current potentials of the coil of measuring.

So, if present embodiment is obtained insulation breakdown voltage-in abutting connection with internal electrode current potential ratio characteristic line illustration, just can easily infer insulation breakdown voltage in advance.

Figure 12 is as the 1st operation (insulation breakdown voltage-dielectric property line illustration that the 4th embodiment in the step 1) is suitable for.

When the water of the conductor leakage of cooling water of supply conductor was immersed in the insulation course, the dielectric property of insulation course will change.

In dielectric property, static capacity, dielectric dissipation factor, dielectric loss angle, dielectric loss angle tangent (tan δ), power factor etc. are arranged.Immerse in the insulation course even leak, also can utilize these parameters.

But, with respect to the above two (static capacity, dielectric dissipation factor), can change when the variation in thickness of the size of internal electrode, insulation course, back three (dielectric loss angle, dielectric loss angle tangent, power factor) is not subjected to the size of internal electrode, the influence that thickness of insulating layer changes.

On the other hand, because around the coil afterbody, the operator is wrapped in insulating tape on the conductor with hand, so the thickness of insulation course is unfixing.In addition, be provided with the fixed component that is used for fixing coil, therefore will have the situation that the potential electrode of same size can not be set by coil at the coil afterbody.

The following examples have been considered these aspects, in the three of back, for example select dielectric loss angle tangent (tan δ).

Insulation breakdown voltage-dielectric property line illustration shown in Figure 12 can be applicable to the coil that comprises 3 (3 layers) internal electrodes, is chilled water is leaked into the dielectric loss angle tangent tan δ b figure of curveization respectively on dielectric loss angle tangent tan δ a, the 2nd internal electrode b on dielectric loss angle tangent tan δ the 0, the 1st internal electrode a on the conductor behind the insulation course from conductor.

There is structural restriction in present embodiment, even do not install at insulation course under the situation of potential electrode of same size, chilled water is leaked easily to insulation course, can hold reliably thus.

Then, quote Figure 13 to Figure 16, illustrate as the 1st operation and (leak the 5th embodiment of the affirmation means of conductor chilled water to insulation course in the step 1).

In the present embodiment, be conceived to when existing when insulation course leaks the conductor chilled water, dielectric property is according to the water leakage of conductor chilled water, frequency dependence improves, figure 13 illustrates the frequency characteristic of the static capacity between 3 (3 layers) internal electrodes and the potential electrode, figure 14 illustrates the long-pending frequency characteristic of static capacity and dielectric loss angle tangent.

In these Figure 13, Figure 14, solid line represents that characteristic, the dotted line of dry insulation course represent that the conductor chilled water is immersed in the situation of about 33% thickness of insulating layer, and dotted line represents that the conductor chilled water is immersed in the situation of about 70% thickness of insulating layer.

Based on these Figure 13, Figure 14, with respect to not leaking under the situation of conductor chilled water to insulation course, dielectric property is very little to frequency dependence, is leaking under the situation of conductor chilled water to insulation course, and dielectric property uprises the dependence of frequency.

For example, represent the dielectric property of dielectric property/10kHz of 1kHz and the conductor chilled water immerses relation from ratio to insulation course with the frequency change line illustration of insulation breakdown voltage-dielectric property shown in Figure 15.

Thus the frequency change line illustration of insulation breakdown voltage-dielectric property as can be known, the close relation of the frequency dependence of dielectric property and insulation breakdown voltage.

The frequency change line illustration of the coil insulation disintegration voltage-dielectric property that comprises two (2 layers) internal electrodes has been shown among Figure 16 on the other hand.

In this Figure 16, solid line is illustrated in the ratio near the measured value of the long-pending 1kHz of the potential electrode of the installation of the surface of insulating layer on the conductor of the anchor clamps that do not have internal electrode and static capacity between conductor and dielectric loss angle tangent and 10kHz; Dotted line is illustrated in the ratio of the measured value of the 1kHz that amasss of potential electrode that the insulation course outside surface on the internal electrode installs and the static capacity between conductor and dielectric loss angle tangent and 10kHz.

The frequency change rate line illustration of insulation breakdown voltage-dielectric property shown in Figure 16, owing to use same electrode, at the same position place, only changing frequency measures, so deviation is little in the data, do not rely on this point of size, thickness of insulating layer of internal electrode the measuring accuracy height in measurement result.

So, in the present embodiment, if wait the frequency change rate line illustration that has obtained insulation breakdown voltage-dielectric property in advance by experiment, then at least by two frequency measurement dielectric properties, if get their ratio, just can simply easily infer insulation breakdown voltage.

Figure 17 and 18 figure are as the 1st operation (insulation breakdown voltage-internal electrode potential property line illustration that the 6th embodiment in the step 1) is suitable for.

Infer in the insulation breakdown voltage method of coil covering, use relative initial value ratio characteristic line illustration at the voltage of the insulation breakdown shown in Fig. 7～Figure 11-internal electrode potential property line illustration, insulation breakdown voltage-internal electrode current potential, insulation breakdown voltage-respectively in abutting connection with internal electrode current potential ratio characteristic line illustration, obtain the relative initial value that corresponds respectively to each internal electrode current potential of measuring, internal electrode current potential than, in abutting connection with the insulation breakdown magnitude of voltage of internal electrode current potential ratio.

In the case, with respect to a measured value, try to achieve 2 insulation breakdown magnitudes of voltage usually.

Quote the method for obtaining the insulation breakdown magnitude of voltage that Figure 17 illustrates this kind situation.

Figure 17 is the insulation breakdown voltage-internal electrode potential property line illustration of the relation of the current potential Va of internal electrode a of coil of the expression internal electrode that comprises 3 (3 layers) Fig. 8 that illustrated and insulation breakdown voltage.

In Figure 17, current potential Va is that can access insulation breakdown voltage is 59% (B point), two values of 17% (C point) under 83% the situation.

On the other hand, shown in figure the 18th, the dielectric loss angle tangent tan δ a of the insulation course on the internal electrode a is 1.8% (B ').Think this dielectric loss angle tangent tan δ=1.8%th, sharply the last stage (B ') of rising, insulation breakdown voltage is about more than 50%.

Consider this dielectric loss angle tangent tan δ=1.8% o'clock, insulation breakdown voltage is about more than 50%, and inferring at above-mentioned current potential Va is 83% o'clock, and insulation breakdown voltage is 59% (the B point of Figure 17).

Therefore, if insulation breakdown voltage drops to 17% (the C point of Figure 17), from Figure 18, read dielectric loss angle tangent tan δ=69% (C ' point), no matter measuring accuracy deterioration how also can not become dielectric loss angle tangent tan δ a=69% with the measurement of dielectric loss angle tangent tan δ a=2% situation.

Therefore, insulation breakdown voltage can not drop to 17%, is estimated as 59%.

So, present embodiment is being obtained under the insulation breakdown voltage condition according to insulation breakdown voltage-internal electrode potential property line illustration, because combined insulation disintegration voltage-dielectric property line illustration is judged insulation breakdown voltage, so can obtain suitable insulation disintegration voltage value.

Figure 19 is as the 1st operation (insulation breakdown voltage-internal electrode potential property line illustration that the 7th embodiment in the step 1) is suitable for.

When inferring the insulation breakdown voltage of coil covering, in above-mentioned the 6th embodiment, combined insulation disintegration voltage-internal electrode potential property line illustrations etc. and insulation breakdown voltage-dielectric property line illustration from two insulation breakdown magnitudes of voltage obtaining, are judged desired value; In the present embodiment, from two insulation breakdown magnitudes of voltage obtaining,, carry out the judgement of desired value according to of the variation of insulation breakdown magnitude of voltage through the time.

Figure 19 is an one example.

For example, the current potential Va that measured before 1 year is that with measurement result and the time spent of above-mentioned dielectric loss angle tangent tan δ a, insulation breakdown voltage is estimated to be 71% (A point) under 65% the situation.

On the other hand, be under 83% the situation, to the immersion speed that insulation course leaks, not consider that insulation breakdown voltage drops to 17% (C point) quickly in the period of 1 at the current potential Va that this is measured according to the conductor chilled water, it is estimated as 59% (B point).

So, in the present embodiment, owing to, considered to measure the variation through the time of current potential, so can select suitable insulation disintegration voltage value with respect to two insulation breakdown magnitudes of voltage obtaining according to insulation breakdown voltage-internal electrode potential property line illustration.

Then, illustrate as the 1st embodiment in the 2nd operation (step 2) of the 1st embodiment of the residual life presuming method of coil and the method for the decline rate of suitable insulation breakdown voltage.

In the present embodiment, remove to cover the part of insulation course of anchor clamps that the conductor chilled water does not immerse 6 coils of insulation course, and in 1 hollow wire rod, for example leave the hole of diameter 0.3mm, guarantee around the hole, to exist the gap, so that do not hinder the outflow of leaking, and use and carried out the coil of insulation again from hollow wire rod.

During test, for example, per 2 coils make respectively and are controlled at 95 ℃ of temperature, 80 ℃, 70 ℃ ion-exchange water cycle.

Then, the current potential of periodic measurement internal electrode uses and leaks to the immersion degree and the insulation breakdown voltage-internal electrode potential property line illustration of insulation course, infers insulation breakdown voltage.In addition, in different periods, 2 coils to the ion exchange water of 95 ℃, 80 ℃, 70 ℃ of each temperature of having circulated destroy the insulation of left and right sides coil afterbody respectively.

After the insulation breakdown, the warm water cycling time of ion exchange water and the relation of insulation breakdown voltage as shown in figure 20, Figure 20 is as insulation breakdown voltage-warm water line illustration cycling time.

Then, relation for the decline rate of the temperature of obtaining recirculated water and insulation breakdown voltage, in the present embodiment, according to gradient shown in Figure 20 (slope), making shown in Figure 21 is to represent the logarithm of the decline rate of insulation breakdown voltage, represent the line illustration (be called A Leiniesi (ア レ one ニ ウ ス) figure) of the inverse number of absolute temperature with transverse axis with the longitudinal axis.

As above, in the present embodiment, owing to make insulation breakdown voltage decline rate-temperature line illustration shown in Figure 21 in advance, so can easily obtain the decline rate of the insulation breakdown voltage under the arbitrary temp.

And the corrosion condition of the defect level of soldering part and soldering part changes various., test for this reason, then can hold of the influence of the difference of the water leakage that is immersed in insulation course the decline rate of the immersion speed of leaking, insulation breakdown voltage if change the size and the quantity in the hole of leaving in the above-mentioned hollow wire rod.

In addition, in the above-described embodiments, in hollow wire rod, leave the hole artificially, water is spilt, also can from generator is extracted in the running of generator, cause the coil that leaks, use as the sample of warm water cyclic test.In the case, though deviation becomes greatly, help and under condition, to test near reality.

Figure 22, Figure 23 and Figure 24 are the line illustrations of the method that is used to illustrate the decline rate of obtaining insulation breakdown voltage that is suitable for as the 2nd and the 3rd embodiment in the 2nd operation (step 2) of the 1st embodiment of coil residual life presuming method.

Present embodiment is and with the damp and hot deterioration test of a plurality of temperature of the test film of the temperature cycling test of the coil of 1 temperature and excision insulation course, obtains the decline rate of the insulation breakdown voltage under the arbitrary temp.

In other words, the deterioration (being called damp and hot deterioration) of the insulation course that causes along with water and temperature, the resin in the insulation course, the chemical bond of for example epoxy resin go bad because of adding water decomposition, and the containing ratio of specific base changes.The representative of this specific base is an ester group.In resin, exist under the situation of ester group, cut off ester group, be changed to organic acid and hydroxy by adding water decomposition.

Therefore, in the progress degree of damp and hot deterioration and the minimizing degree of ester group, or there is correlationship between the increase degree of organic acid or hydroxy.

Present embodiment is utilized this phenomenon, test the temperature dependency of the tempo of damp and hot deterioration with the test specimen (cutting the test film of going out) of insulation course, with the deterioration test result combinations of a temperature of using in the actual coil, obtain the decline rate of the insulation breakdown voltage of arbitrary temp.

This want the insulation breakdown voltage obtained decline rate (d (BDV)/dt, BDV: insulation breakdown voltage, t: the time) by following distortion:

[mathematical expression 2]

According to the warm water cyclic test of actual coil or make operating coils obtain the 1st of the right of formula (3), in cutting out the damp and hot deterioration test of test film, insulation course obtains the 2nd.

Below, the method for the decline rate of insulation breakdown voltage is obtained in detailed description based on the temperature dependency of the tempo of damp and hot deterioration.

In the present embodiment, at first, in the A operation, in the coil warm water cyclic test of 1 temperature, under 1 temperature only, carry out and the identical test of warm water cyclic test in the 2nd operation (step 2) of the 1st embodiment of the residual life presuming method of coil, described in the 1st embodiment.Better according to duration of test decision test temperature, what temperature was high can shorten duration of test a side.As an example, the ion exchange water of 95 ℃ of temperature is circulated in a plurality of conductors, testing with the insulation breakdown of 5 months laggard line circles after two months, obtain insulation breakdown voltage.Make insulation breakdown voltage-warm water line illustration cycling time (95 ℃ the figure of Figure 20) according to test findings, can obtain 95 ℃ of coils, the decline rate of the insulation breakdown voltage under 1 temperature as this slope.

Carry out after the insulation breakdown test of coil, present embodiment is disintegrated insulation course, and insulation course is taken a sample, as the specific basic S that comprises in the insulation course, with the containing ratio Ga of infrared absorption spectrum measurement ester group.

Then, in the B operation, for example, test film as the rectangular shape of cutting 40mm * 50mm, cut the conductor chilled water and not have the insulation course under the situation of leakage, this insulation course is immersed in the conductor cooling water temperature for example is controlled in 95 ℃, 80 ℃, 70 ℃ the ion exchange water, take out by each preset time, by the ester group containing ratio Gb that contains in the infrared absorption spectrum measurement insulation course.

And, at this, owing to ester group containing ratio Ga, Gb compare with its absolute value, from the ester group containing ratio Ga in the insulation course of original state (position deterioration state) ₀, Gb ₀Variation be important, so, also can use both difference Δ Ga, Δ Gb (Δ G=|G-G ₀|).In the data processing below, replace ester group containing ratio Ga, Gb, use Δ Ga, Δ Gb to describe.Ga, Gb, the line illustration of the linear yardstick of Shi Yonging in the following description---Figure 22 and Figure 23 become only Ga if use ₀, Gb ₀Parallel mobile line illustration.Owing to use the slope of these line illustrations, so net result is identical.

Represent changes delta Ga and Δ Gb and deterioration time relation with Figure 22 from the initial value of the ester group containing ratio of acquisition like this.In addition, represent the insulation breakdown voltage of coil with Figure 23 and from the relation of the variation delta Ga of the initial value of the ester group containing ratio Ga in the insulation course of coil.The regression straight line gradient (slope) of the drawing of the line illustration shown in Figure 23 is the ester group containing ratio dependence Ka of coil insulation disintegration voltage, corresponding to the 1st of formula (3) the right.

Then, in the C operation, the pace of change of the ester group containing ratio that will obtain according to the gradient (slope) of the line illustration shown in Figure 22 (be Ua, be Ub for cutting a test film that for coil) and the relation of degradation temperatures are plotted as A Leiniesitu, are shown in Figure 24.

In Figure 24, draw out regression straight line X according to the drawing point of 3 temperature (95 ℃, 80 ℃, 70 ℃) of cutting slice of insulation course, and, the drawing point of the time pace of change of the ester containing ratio by actual coil describes to represent to be parallel to the temperature dependent straight line Y that infers of pace of change of ester containing ratio of the actual coil of regression straight line X.Infer the time pace of change Uc that straight line Y can obtain the ester group containing ratio in the coil covering under the arbitrary temp thus.For example, the coil-conductor temperature when generator operation is that from Figure 24, the time pace of change Uc that can obtain (inferring) ester containing ratio is 0.08/ under 70 ℃ the situation.The time pace of change Uc of ester containing ratio that should be under predetermined temperature is corresponding to the 2nd on the right of formula (3).

(the ester group containing ratio dependence Ka of the insulation breakdown voltage of coil) and the long-pending of (the time pace of change Uc of the ester group containing ratio under the operating temperature of coil) so obtained are the decline rates of the insulation breakdown voltage under the coil operating temperature.

And, though in the present embodiment, use the ester group containing ratio as the deterioration amount, be not limited thereto, also can use chemical analysis instrument to analyze the increase of organic acid containing ratio, substitute the ester group of formula (3) and used.In addition, by adding water decomposition, show under the situation of the sensitiveer variation of other base, also can analyze this specific base and be used by the kind of resin.

In addition, in the above-described embodiment, will cut test film, be impregnated in the ion exchange water that is controlled at 95 ℃, 80 ℃, 70 ℃, but this situation be to make the whole surface of test film touch water from what intact coil cut out.On the other hand, because in the coil of reality, only immerse water from conductor, so think and compare with cutting a test film that, deterioration is considerably slow.Therefore, if in order to make section deterioration that the warm water of the test film that goes out causes near actual, 5 in 6 are sealed with types such as sheet metal moisture-proof epoxy resin, only make 1 to contact with warm water, the test film that maybe will cut out is by the peristome of the container that advances to fill water, only make 1 face that cuts the test film that touch warm water and carry out damp and hot deterioration test, then can make the deterioration condition near actual coil.

So, present embodiment just has this advantage, to use the large-scale experiment of coil to be defined as only 1 temperature, temperature dependency for damp and hot degradation speed, owing in the laboratory, use to cut the containing ratio that test film comes the specific base of distinctive chemistry that the damp and hot deterioration of analysis to measure causes, so can obtain the decline rate of insulation breakdown voltage with small-scale test by in the relatively short time and only obtain the method for insulation breakdown voltage decline rate by the described warm water cyclic test of above-mentioned the 1st embodiment.

The 4th embodiment of the method for the decline rate of obtaining insulation breakdown voltage in the 2nd operation (step 2) of the 1st embodiment of residual life presuming method of coil then, is described.

Obtain under the situation of decline rate of insulation breakdown voltage, in the coil test in the 1st embodiment that is to use above-mentioned the 2nd operation (step 2) and the 2nd embodiment, when the cyclic test of ion exchange water, do not apply high voltage.

But when insulation course was applied voltage, in the insulation course that has applied high electric field, the power (Maxwell's stress) of the material of high-k was invaded in effect, compares with the situation that does not have electric field, and the immersion speed of ion exchange water accelerates.

In addition, the propulsion phase in the immersion of ion exchange water, in the insulation course that does not immerse ion exchange water, apply higher electric field, current weigherization is also accelerated.Therefore, need hold the influence of voltage in advance.

Present embodiment is considered these aspects, make the ion exchange water circulation time in coil-conductor that is controlled at set point of temperature, if between the semi-conductive layer on the surface of conductor and coil straight line portion, apply under the high-tension situation, the both of these case that does not have the making alive situation is carried out deterioration test, both test findings are relatively obtained the influence of the decline rate of the insulation breakdown voltage that the impressed voltage in the temperature of ion exchange water causes.

Below, further specifically describe.At first, the test of the coil of an embodiment in the 1st embodiment to the 3 embodiments of above-mentioned the 2nd operation (step 2) of enforcement use.Can obtain the decline rate DRBDV (not powering up) of the insulation breakdown voltage that leaking of powering state not cause by this test.Both can test therewith simultaneously, also can pass through other chance, use with these test identical many for the examination coil, one side will be controlled at set point of temperature ion exchange water remain on certain hydraulic pressure, one side is circulated it in coil-conductor.At this moment, with the conductor ground connection of these coils, the conductive formation of the line part of coil is applied with the voltage of regulation.Carry out the insulation breakdown test in immersion water different a plurality of moment of degree, obtain insulation breakdown voltage, make insulation breakdown voltage-warm water line illustration cycling time, obtain the decline rate DRBDV (powering up) of the insulation breakdown voltage that leaking of powering state cause thus according to this slope.The accelerator coefficient that powers up of this situation is obtained by DRBDV (powering up)/DRBDV (not powering up).

In Fig. 2, draw out insulation breakdown voltage from now on decline rate infer line L the time, the coil for the line side of the influence that can not ignore voltage uses above-mentioned DRBDV (powering up).

And, apply voltage, the voltage between rated voltage (voltage between lines) and the rated voltage/ (voltage-to-ground) normally, duration of test, the exploration warm water temperature causes the acceleration of deterioration, also can use other voltage.

In addition,, just the deterioration accelerator coefficient that causes can be more clearly powered up, the decline rate of insulation breakdown voltage that applies the coil of voltage with respect to difference can be more correctly inferred if use a plurality of piezoelectric voltages that add to test.

Therefore so, owing in the present embodiment, make ion exchange water circulation time in conductor apply voltage, just can obtain more decline rate near the insulation breakdown voltage under the condition of operating condition to coil.

Figure 25 be used for illustrating obtain as the 4th embodiment of the 2nd operation (step 2) of the 1st embodiment of coil residual life presuming method and insulation breakdown voltage method, coil of the decline rate of suitable insulation breakdown voltage-duration of runs line illustration.

Obtain under the situation of decline rate of insulation breakdown voltage, in above-mentioned the 1st～the 3rd embodiment, obtain the decline rate of insulation breakdown voltage according to breadboard experimental data, present embodiment is to obtain the decline rate of insulation breakdown voltage in safeguarding the coil of real-world operation.

In other words, present embodiment is with respect to the coil of real-world operation, measure the internal electrode current potential termly or install and measure electrode at the insulation course outside surface of chuck side insulation course from the scope that exists of internal electrode, measure the dielectric property between conductor and potential electrode, according to the variation of measured value hold the conductor chilled water immerse insulation course beginning period (among the figure, S), for example, after predetermined 2 years (Δ t), extract coil and obtain insulation breakdown voltage; According to immersing beginning S in period to the Δ t duration of runs (for example 2 years) that extracts coil and the presumed value that is extracting the insulation breakdown voltage under the situation that coil do not leak the conductor chilled water constantly (for example the figure to insulation course from the conductor chilled water, 88%) and the difference Δ V of present insulation breakdown voltage (for example 57%), obtains the insulation breakdown voltage decline rate Δ V/ Δ t (among the figure 31%/2 year=15.5%/year) of coil.

Because in the present embodiment, the time that is spent till the decline rate of obtaining the coil insulation disintegration voltage reflects the deterioration state of insulation course, the real-world operation condition of coil fully, so can obtain the decline rate of coil insulation disintegration voltage more accurately.

And, in the test of the 1st embodiment～the 4th embodiment of the 2nd operation (step 2) of the decline rate of obtaining above-mentioned insulation breakdown voltage, because after the measurement of the internal electrode current potential of insulation course and measurement are installed in surface electrode and conductor or the dielectric property between the internal electrode below it on the insulation course, obtain insulation breakdown voltage, if so put the relation of insulation breakdown voltage and various measurement results in order based on this test findings, then can obtain insulation breakdown voltage-internal electrode potential property line illustration, the relative initial value ratio characteristic line illustration of insulation breakdown voltage-internal electrode current potential, insulation breakdown voltage-in abutting connection with internal electrode current potential ratio characteristic line illustration, insulation breakdown voltage-dielectric property line illustration, the frequency change rate line illustration of insulation breakdown voltage-dielectric property.These line illustrations can be used in infers the 1st to the 7th of insulation breakdown voltage method in the 1st operation

Embodiment.

The 1st embodiment of coil residual life estimating device of the present invention then, is described.

Figure 26 is in coil residual life estimating device of the present invention, and the synoptic diagram of potential electrode is set at the insulation course outside surface of coil for the dielectric property of measuring insulation course.

In the structure of coil, at insulation course 13 and the 1st～the 3rd insulation course 13a, 13b, the 13c that cover conductor 12 and anchor clamps 17 the 1st～the 3rd internal electrode 14a, 14b, 14g are set, and the outside surface at insulation course installs and measures electrode 24a, 24b, 24s, between the 1st internal electrode 14a, the 2nd internal electrode 14b, conductor 12, apply voltage, the measuring media characteristic.

But, can not see from the outside position of each internal electrode 14a, 14b, 14g, producing disadvantageous situations such as measuring error sometimes according to how potential electrode 24a, 24b, 24s are set.

For this reason, when present embodiment is provided with potential electrode 24a, 24b, 24s on the direction of principal axis of coil, surface potential measurement probe (not shown) is moved in the outside surface advance and retreat of insulation course, the surface measurements current potential installs and measures electrode 24a, 24b, 24s at stable surface electrical bit position as shown in the figure.

As mentioned above, because present embodiment has been installed each potential electrode 24a, 24b, 24s at the outside surface of insulation course,, can reduce measuring error so the position of each potential electrode 24a, 24b, 24s just can not be offset.

Below, the 2nd embodiment of coil residual life estimating device of the present invention is described.

Owing to can not directly on internal electrode, connect measurement mechanism, so, need try every possible means, determine measure in order to measure internal electrode and to be installed in static capacity between the potential electrode of insulation course outside surface.

Figure 27 be for example represent when the dielectric property of the afterbody insulation course of measuring the turbogenerator coil, to be suitable for, connecting coil and Medium Measurement schematic representation of apparatus.

Among Figure 27, with the spiral 28 that a plurality of coil serial or parallel connections have connected, every independent 1 usefulness rectangle is represented.

In the reality, the line part of each coil 25 (25a, 25b) is inserted into unshakable in one's determination 26 groove shown in the sectional view of intercepting part.Assigned position at the coil afterbody installs and measures electrode 24 (24a, 24b, 24s), connects an end of concentric cable 30 on the low-voltage terminal 29 of dielectric characteristic measurement device 27, and the other end is connected to potential electrode 24 (24a, 24b, 24s).

In addition, be connected with an end of concentric cable 32, the other end is connected to the lead-in wire lead-out terminal 33 of generator and any at least end in the neutral terminal 34 in the HV Terminal 31 of dielectric characteristic measurement device 27.

The ground terminal of dielectric characteristic measurement device 27 or protection terminal 35 are earth-free.

By such syndeton measuring media characteristic (static capacity, dielectric dissipation factor, dielectric loss angle, dielectric loss angle tangent, power factor) time, both become roughly the same current potential to the internal electrode of floating-potential because of the bigger static capacity between internal electrode lotus conductor, in fact, generation voltage from dielectric characteristic measurement device 27 all is applied between internal electrode and the potential electrode 24 (24a, 24b, 24s), can measure high-precision dielectric property.

In addition, in the present embodiment, the HV Terminal 31 of dielectric characteristic measurement device 27 is connected to lead-in wire lead-out terminal 33 and neutral terminal 34, but be not limited to this example, for example as shown in figure 28, also the HV Terminal 31 of dielectric characteristic measurement device 27 can be connected in the housing 36 of the generator of accommodating coil.

When with such syndeton measuring media characteristic (static capacity, dielectric dissipation factor, dielectric loss angle, dielectric loss angle tangent, power factor), the current potential of the internal electrode of floating-potential is because of as the outermost internal electrode 14g (not shown) of ground potential and the big static capacity between the internal electrode, and becomes the current potential promptly identical with the current potential of case 36 with ground potential haply.

Therefore, according to present embodiment, the generation voltage of dielectric characteristic measurement device 27 all is applied between internal electrode and the potential electrode 24 (24a, 24b, 24s) in fact, can the high dielectric property of measuring accuracy.

And, can be connected to if the link position of concentric cable 32 substitutes generator case 36 and to be contained in any positions in the case 36 and parts 26 same potential unshakable in one's determination, for example, also can be directly connected to a part of unshakable in one's determination 26.

In addition; for example; as Figure 29 and shown in Figure 30; potential electrode 24 (24a; 24b; 24s) on insulcrete 37, paste the soft member 38 that soft rubber or sponge etc. are rich in insulativity; configured electrodes portion 39 and guard electrode 40 on this; if or for example as Figure 31 and shown in Figure 32; plug-in mounting insulating trip 41 between electrode 39 and guard electrode 40; and the wire rod and the sealing of concentric cable 30 are connected to electrode part 39 and guard electrode 40 respectively; then electrode part 39 and guard electrode portion 40 closely are connected to coil surface; and by guard electrode 40; the electric field disorder that becomes source of error that around electrode part 39, takes place can be reduced, high-precision measurement can be carried out.

Utilizability on the industry

In the past, for example, when increasing the capacity that rotates in the motor, because the Joule loss that produces at fixed coil makes temperature become too high, be difficult to carry out stable running. For this reason, in the process that turns round with the direct cooling conductor of cooling water, leak out cooling water from conductor, be immersed in the situation of insulation layer, need a kind of technology that coil residue life-span of reliably carrying out the pre-test coil life-span infers of obtaining, according to the present invention, a kind of residue life-span presuming method and coil residue life-span estimating device of coil can be provided, the coil of insulation layer that leaks from conductor, need not extract coil, the insulation of inferring to non-destructive the insulation layer destroys voltage, destroys voltage according to the insulation of inferring and infers out the residue life-span; Can non-destructive ground, simple and easy and infer easily the coil residue life-span from now on, with respect to disposal such as the rapid exchange of coil, guarantees, can tackle rapidly. The measuring media characteristic can be inferred the coil residue life-span accurately accurately. Therefore, not still in this technical field, but also industrially widely utilization and extention the present invention.

Claims (26)

1, a kind of residual life presuming method of coil, it is characterized in that, comprise: the 1st operation, whether affirmation leaks into insulation course from the chilled water of conductor, leak under the situation of insulation course at above-mentioned conductor chilled water, carry out the required measurement of inferring, infer the insulation breakdown voltage of coil the insulation breakdown voltage of coil; The 2nd operation is obtained the temperature of above-mentioned coil and the voltage that applies according to above-mentioned coil operating condition from now on, obtain this coil temperature and the voltage that applies in the decline rate of insulation breakdown voltage of any one caused above-mentioned coil at least; The 3rd operation is extrapolated to the data of obtaining by the 1st operation and the 2nd operation, obtains the period that insulation breakdown voltage drops to the above-mentioned coil required voltage of running.

2, the residual life presuming method of coil according to claim 1, it is characterized in that, the 1st operation of inferring the insulation breakdown voltage of coil is: the conductor to coil applies alternating voltage, outer surface measuring internal electrode current potential at the insulation course on internal electrode top, according to insulation breakdown voltage-internal electrode potential property line illustration of making in advance, obtain the insulation breakdown voltage corresponding with measured internal electrode current potential.

3, the residual life presuming method of coil according to claim 1, it is characterized in that, the 1st operation of inferring the insulation breakdown voltage of coil is: the conductor to coil applies alternating voltage, outer surface measuring internal electrode current potential at the insulation course on internal electrode top, obtain the initial value of the internal electrode current potential of measurement and this internal electrode current potential or be judged as the not ratio of any one in the internal electrode current potential of the above-mentioned coil that insulation course leaks of conductor chilled water, according to the relative initial value ratio characteristic line illustration of insulation breakdown voltage-internal electrode current potential of making in advance, obtain the insulation breakdown voltage corresponding with this ratio of obtaining.

4, the residual life presuming method of coil according to claim 1, it is characterized in that, the 1st operation of inferring the insulation breakdown voltage of coil is: the conductor to coil applies alternating voltage, outer surface measuring internal electrode current potential at the insulation course on internal electrode top, obtain the ratio between the internal electrode current potential of adjacency, according to the insulation breakdown voltage of making in advance-, obtain the insulation breakdown voltage corresponding with this ratio of obtaining in abutting connection with the ratio characteristic line illustration of internal electrode current potential.

5, the residual life presuming method of coil according to claim 1, it is characterized in that, the 1st operation of inferring the insulation breakdown voltage of coil is: at the outside surface of the insulation course that possesses internal electrode and leave on the partial insulating layer outside surface of above-mentioned internal electrode and install and measure electrode, measure between this potential electrode and the above-mentioned internal electrode, and this potential electrode and leave each dielectric property between the conductor of part of above-mentioned internal electrode, according to insulation breakdown voltage-dielectric property line illustration of making in advance, obtain the insulation breakdown voltage corresponding with measured dielectric property.

6, the residual life presuming method of coil according to claim 1, it is characterized in that, the 1st operation of inferring the insulation breakdown voltage of coil is: from the upper side of internal electrode and leave the potential electrode that the outside surface of each insulation course of conductor upper side of the part of above-mentioned internal electrode is installed, the frequency dependence of measuring media characteristic, and obtain the ratio of the dielectric property of two frequencies, according to the frequency change rate line illustration of the insulation breakdown voltage-dielectric property of making in advance, obtain the insulation breakdown voltage corresponding with this ratio of obtaining.

7, the residual life presuming method of coil according to claim 1, it is characterized in that, the 1st operation of inferring the insulation breakdown voltage of coil is: when using insulation breakdown voltage-internal electrode potential property line illustration, the relative initial value ratio characteristic line illustration of insulation breakdown voltage-internal electrode current potential, and any one of insulation breakdown voltage-in internal electrode current potential ratio characteristic line illustration is when obtaining insulation breakdown voltage, when the current potential to an internal electrode can obtain under the situation of two insulation breakdown magnitudes of voltage, combined insulation disintegration voltage-dielectric property line illustration judges it is among above-mentioned two insulation breakdown magnitudes of voltage which.

8, the residual life presuming method of coil according to claim 1, it is characterized in that, the 1st operation of inferring the insulation breakdown voltage of coil is: when using insulation breakdown voltage-internal electrode potential property line illustration, the relative initial value ratio characteristic line illustration of insulation breakdown voltage-internal electrode current potential, and any one of insulation breakdown voltage-in internal electrode current potential ratio characteristic line illustration is when obtaining insulation breakdown voltage, when obtaining under the situation of two insulation breakdown magnitudes of voltage to an internal electrode current potential, according to the passing of the current potential of former measurement, judge it is in two insulation breakdown magnitudes of voltage which.

9, the residual life presuming method of coil according to claim 1, it is characterized in that, the 2nd operation of decline rate of inferring the insulation breakdown voltage of coil is: near the hollow wire rod anchor clamps leave the hole of certain size and do not cause many coils leaking or running in confirm as the coil that leaks the conductor chilled water in the insulation course, make the water that is set in temperature more than 2 kinds remain in water, the circulation of working of going forward side by side in a plurality of conductors with certain hydraulic pressure at each temperature; Under each temperature, immersing different a plurality of moment of degree at water carries out insulation breakdown and tests and obtain insulation breakdown voltage, make insulation breakdown voltage-warm water line illustration cycling time cycling time according to insulation breakdown voltage of obtaining and warm water, and obtain the decline rate of insulation breakdown voltage according to this insulation breakdown voltage-warm water line illustration cycling time, according to the decline rate making expression of the insulation breakdown voltage of obtaining and the A Leiniesitu of the relation of the temperature of recirculated water, obtain the decline rate of the insulation breakdown voltage corresponding according to A Leiniesitu with the arbitrary temp of recirculated water.

10, the residual life presuming method of coil according to claim 1 is characterized in that, the 2nd operation of decline rate of inferring the insulation breakdown voltage of coil comprises following operation:

The A operation, near anchor clamps hollow wire rod is left the aperture of certain size and do not caused many coils that leak, or in the real-world operation coil, confirm as in the insulation course coil that immerses water, make the water that is set in a kind of predetermined temperature in conductor, keep certain hydraulic pressure and circulation, immerse the different a plurality of warm water circulations of degree at water and carry out the insulation breakdown test constantly, obtain insulation breakdown voltage, then, coil is disintegrated, insulation course is taken a sample, measurement in the resin of insulation course because of adding the containing ratio Ga of the chemical specific basic S that water decomposition changes, and obtain rate of change Ka with respect to the insulation breakdown voltage of Ga, and through the pace of change Ua of the Ga of warm water cycling time;

The B operation, make the test film of the insulation course that cuts out from complete coil contact the stipulated time with the warm water of temperature more than 2 kinds, after this take out, measure and the of the same race specific basic S containing ratio Gb in test that in above-mentioned A operation, uses, and the temperature of each warm water is obtained pace of change Ub based on the Gb of warm water duration of contact;

The C operation, any one is made as logarithm chi axle the pace of change Ub of the containing ratio Gb of specific basic S under a plurality of temperature that obtain in the pace of change Ua of the containing ratio Ga of specific basic S in the insulation course that obtains in above-mentioned A operation and the above-mentioned B operation, temperature is made as in another the curve map, go out to be parallel to the line of latter's regression straight line by 1 point-rendering that obtains by the former, obtain the pace of change Uc of the containing ratio of setting arbitrarily the specific basic S under the temperature;

Long-pending as the pace of change Uc of the containing ratio of the rate of change Ka of the insulation breakdown voltage that obtains in above-mentioned A operation and the specific basic S under the set point of temperature that above-mentioned C operation obtains obtained the decline rate of the insulation breakdown voltage under the set point of temperature.

11, the residual life presuming method of coil according to claim 1 is characterized in that, the 2nd operation of decline rate of inferring the insulation breakdown voltage of coil comprises following operation:

The A operation, near anchor clamps hollow wire rod is left the aperture of certain size and do not caused many coils that leak or confirm as in the insulation course coil that immerses water in the real-world operation coil, make the water that is set in a kind of predetermined temperature in conductor, keep certain hydraulic pressure and circulation, immerse the different a plurality of warm water circulations of degree at water and carry out the insulation breakdown test constantly, obtain insulation breakdown voltage; Then coil is disintegrated, and insulation course is taken a sample, measure in the insulation course resin containing ratio Ga because of the specific basic S in the containing ratio Ga that adds the chemical specific basic S that water decomposition changes and the complete insulation course ₀(initial value of the containing ratio of specific basic S), and obtain the containing ratio of specific basic S from the variation delta Ga of initial value (| Ga-Ga ₀|), obtain rate of change Ka, and obtain pace of change Ua through the Δ Ga of warm water cycling time with respect to the insulation breakdown voltage of Δ Ga;

The B operation, make the test film of the insulation course that cuts out from complete coil contact the stipulated time with the warm water of temperature more than 2 kinds, after this take out, measure and the variation delta Gb of the containing ratio of of the same race specific basic S in test film that in above-mentioned A operation, uses, the temperature of each warm water is obtained pace of change Ub through the Δ Gb of warm water duration of contact from initial value;

The C operation, any one is made as logarithm chi axle to the containing ratio of the specific basic S of the containing ratio of specific basic S in the insulation course that will obtain in above-mentioned A operation under the pace of change Ua of the variation delta Ga of initial value and a plurality of temperature of obtaining in above-mentioned B operation in the pace of change Ub of the variation delta Gb of initial value, temperature is made as in another the curve map, go out to be parallel to the line of latter's regression straight line by 1 point-rendering that obtains by the former, obtain the containing ratio of setting arbitrarily the specific basic S under the temperature pace of change Uc from the variable quantity of initial value;

As long-pending from the pace of change Uc of the variable quantity of initial value of the containing ratio of the rate of change Ka of the insulation breakdown voltage that obtains in above-mentioned A operation and the specific basic S under the set point of temperature that above-mentioned C operation obtains, obtain the decline rate of the insulation breakdown voltage under set point of temperature.

12, the residual life presuming method of coil according to claim 1, it is characterized in that, infer the 2nd operation of decline rate of the insulation breakdown voltage of coil, near the hollow wire rod of use anchor clamps left the hole of certain size and do not caused many coils that leak, or on-streamly confirm as the many coils that the conductor chilled water leaks into insulation course, conductor ground connection with these coils, add the voltage of regulation at line part to many coils of this part, to remaining many coils under the state that does not power up, make the warm water that is set in set point of temperature in the conductor of all coils, keep certain hydraulic pressure and water flowing, circulation, carry out the insulation breakdown test in water immersion different a plurality of moment of degree, obtain insulation breakdown voltage, make insulation breakdown voltage-warm water line illustration cycling time cycling time according to insulation breakdown voltage of being obtained and warm water, and obtain the decline rate of coil that in warm water circulation, powers up and the insulation breakdown voltage that does not power up coil, and obtain the increment rate of the decline rate that powers up the insulation breakdown voltage that causes according to both ratio according to this insulation breakdown voltage-warm water line illustration cycling time.

13, the residual life presuming method of coil according to claim 1, it is characterized in that, infer the 2nd operation of decline rate of the insulation breakdown voltage of coil, coil to the equipment of real-world operation, the insulation course outer surface measuring internal electrode current potential on electrode top internally termly, and measure the potential electrode of the coil covering outside surface be arranged on the part of leaving internal electrode and the dielectric property between the conductor, the beginning period that chilled water leaks is held in variation according to these measured values in insulation course, through behind the preset time, extract coil and obtain insulation breakdown voltage; On the other hand, according to begin from chilled water to period that insulation course leaks till extract this coil the duration of runs and do not leak the poor of the presumed value of the insulation breakdown voltage under the chilled water situation and actual insulation breakdown voltage period in the beginning that above-mentioned chilled water leaks to insulation course, obtain the decline rate of the insulation breakdown voltage of coil.

14, the residual life presuming method of coil according to claim 1, it is characterized in that, infer in the 1st operation of insulation breakdown voltage of coil, to having leaked many coils of chilled water, internal electrode current potential according to the outer surface measuring of the upper insulation layer of the nearest electrode of measuring internally before the insulation breakdown test, be arranged between the potential electrode of outside surface of insulation course and conductor and the dielectric property between internal electrode, and the insulation breakdown voltage of after these are measured, measuring, make insulation breakdown voltage-internal electrode potential property line illustration, the relative initial value ratio characteristic line illustration of insulation breakdown voltage-internal electrode current potential, insulation breakdown voltage-in abutting connection with internal electrode current potential ratio characteristic figure, insulation breakdown voltage-in abutting connection with the characteristic line illustration, after this frequency change rate line illustration of insulation breakdown voltage-dielectric property uses these characteristic line illustrations to infer insulation breakdown voltage when measuring.

15, a kind of residual life presuming method of coil, it is characterized in that, comprise: the 1st operation, whether affirmation leaks into insulation course from the chilled water of conductor, leak under the situation of insulation course at above-mentioned conductor chilled water, in the inferring of the insulation breakdown voltage of coil, carry out repeatedly required measurement, can infer the insulation breakdown voltage of coil at each measuring machine through the time; The 2nd operation is obtained the curve that above-mentioned insulation breakdown voltage changed through the time, and extrapolated above-mentioned through time changing curve, predicts the downtrending of insulation breakdown voltage from now on; The 3rd operation is obtained the above-mentioned period that drops to coil running required voltage through time changing curve.

16, the residual life presuming method of coil according to claim 15, it is characterized in that, infer in the 1st operation of insulation breakdown voltage of coil, conductor to coil applies alternating voltage, outer surface measuring internal electrode current potential at the insulation course on internal electrode top, according to insulation breakdown voltage-internal electrode potential property line illustration of making in advance, obtain the insulation breakdown voltage corresponding with measured internal electrode current potential.

17, the residual life presuming method of coil according to claim 15, it is characterized in that, infer in the 1st operation of insulation breakdown voltage of coil, conductor to coil applies alternating voltage, outer surface measuring internal electrode current potential at the insulation course on internal electrode top, obtain the internal electrode current potential of measuring, with the initial value of this internal electrode current potential or be judged as the conductor chilled water and do not leak in the internal electrode current potential of above-mentioned coil of insulation course the ratio of any one, according to the relative initial value ratio characteristic line illustration of insulation breakdown voltage-internal electrode current potential of making in advance, obtain the insulation breakdown voltage corresponding with this ratio of obtaining.

18, the residual life presuming method of coil according to claim 15, it is characterized in that, infer in the 1st operation of insulation breakdown voltage of coil, conductor to coil applies alternating voltage, and at the outer surface measuring internal electrode current potential of the insulation course on internal electrode top, obtain the ratio between the internal electrode current potential of adjacency, according to the insulation breakdown voltage of making in advance-, obtain the insulation breakdown voltage corresponding with this ratio of obtaining in abutting connection with the ratio characteristic line illustration of internal electrode current potential.

19, the residual life presuming method of coil according to claim 15, it is characterized in that, infer in the 1st operation of insulation breakdown voltage of coil, at the outside surface of the insulation course that possesses internal electrode and leave on the outside surface of partial insulating layer of above-mentioned internal electrode and install and measure electrode, measure between this potential electrode and the above-mentioned internal electrode and this potential electrode and leave each dielectric property between the conductor of part of above-mentioned internal electrode, according to insulation breakdown voltage-dielectric property line illustration of making in advance, obtain the insulation breakdown voltage corresponding with measured dielectric property.

20, the residual life presuming method of coil according to claim 15, it is characterized in that, infer in the 1st operation of insulation breakdown voltage of coil, from in the upper side of internal electrode and leave the potential electrode that the outside surface of each insulation course of upper side of conductor of the part of above-mentioned internal electrode is installed, the frequency dependence of measuring media characteristic, obtain the ratio of the dielectric property of two frequencies, according to the frequency change rate line illustration of the insulation breakdown voltage-dielectric property of making in advance, obtain the insulation breakdown voltage corresponding with this ratio of obtaining.

21, the residual life presuming method of coil according to claim 15, it is characterized in that, infer in the 1st operation of insulation breakdown voltage of coil, using insulation breakdown voltage-internal electrode potential property line illustration, the relative initial value ratio characteristic line illustration of insulation breakdown voltage-internal electrode current potential, and insulation breakdown voltage-when any one obtains insulation breakdown voltage in internal electrode current potential ratio characteristic line illustration, when the current potential to an internal electrode can obtain two insulation breakdown magnitudes of voltage, combined insulation disintegration voltage-dielectric property line illustration judges it is in above-mentioned two insulation breakdown magnitudes of voltage which.

22, the residual life presuming method of coil according to claim 15, it is characterized in that, infer in the 1st operation of insulation breakdown voltage of coil, using insulation breakdown voltage-internal electrode potential property line illustration, the relative initial value ratio characteristic line illustration of insulation breakdown voltage-internal electrode current potential, and insulation breakdown voltage-when any one obtains insulation breakdown voltage in internal electrode current potential ratio characteristic line illustration, when the current potential to an internal electrode can obtain two insulation breakdown magnitudes of voltage, according to the passing of the current potential of former measurement, which in two insulation breakdown magnitudes of voltage judgement be.

23, the residual life presuming method of coil according to claim 15, it is characterized in that, infer the 1st operation of the insulation breakdown voltage of coil, to having leaked many coils of chilled water, according to the internal electrode current potential of before insulation breakdown test, measuring recently at the outer surface measuring of the upper insulation layer of internal electrode, be arranged between the potential electrode of outside surface of insulation course and conductor and the dielectric property between internal electrode, with the insulation breakdown voltage of measuring in these measurement backs, make insulation breakdown voltage-internal electrode potential property line illustration, the relative initial value ratio characteristic line illustration of insulation breakdown voltage-internal electrode current potential, insulation breakdown voltage-in abutting connection with internal electrode current potential ratio characteristic figure, insulation breakdown voltage-in abutting connection with the characteristic line illustration, the frequency change rate line illustration of insulation breakdown voltage-dielectric property, and when after this measuring, use these characteristic line illustrations, infer insulation breakdown voltage.

24, a kind of residual life estimating device of coil, it is characterized in that, comprise: the noncontact surface potential meter that the current potential of the internal electrode that is provided with in covering the insulation course of coil is measured, and the dielectric characteristic measurement device that any one and the dielectric property between the potential electrode that the coil covering outside surface is installed at least in above-mentioned internal electrode and the conductor are measured;

Based on according to the insulation breakdown voltage of inferring out by the current potential of measuring, infer residual life,

When above-mentioned insulation course installs and measures electrode, the probe of above-mentioned noncontact surface potential meter is moved along coil, detecting stable surface electrical bit position, above-mentioned potential electrode is installed on the above-mentioned surface of insulating layer.

25, a kind of coil residual life estimating device, it is characterized in that, comprise: the noncontact surface potential meter that the current potential of the internal electrode that is provided with in covering the insulation course of coil is measured, and the dielectric characteristic measurement device that any one and the dielectric property between the potential electrode that the outside surface of coil covering is installed at least in above-mentioned internal electrode and the conductor are measured;

Based on insulation breakdown voltage of obtaining according to the above-mentioned current potential of measuring and above-mentioned dielectric property, infer residual life,

Above-mentioned dielectric characteristic measurement device is connected the lead-in wire lead-out terminal of measured equipment and any at least end in the neutral terminal with HV Terminal, and low-voltage terminal is connected on the potential electrode of the outside surface that is installed in coil covering.

26, a kind of coil residual life estimating device, it is characterized in that, comprise: the noncontact surface potential meter that the current potential of the internal electrode that is provided with in covering the insulation course of coil is measured, and the dielectric characteristic measurement device that any one and the dielectric property between the potential electrode that the outside surface of coil covering is installed at least in above-mentioned internal electrode and the conductor are measured;

Based on insulation breakdown voltage of obtaining according to the above-mentioned current potential of measuring and above-mentioned dielectric property, infer residual life,

Above-mentioned dielectric characteristic measurement device is connected to the case that holds above-mentioned coil and any end in the iron core with HV Terminal, and low-voltage terminal is connected on the potential electrode of the outside surface that is installed in coil covering.

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