CN112881807A - Generator rotor loop resistance and carbon brush loop resistance measuring tool and method - Google Patents
Generator rotor loop resistance and carbon brush loop resistance measuring tool and method Download PDFInfo
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- CN112881807A CN112881807A CN202110022283.XA CN202110022283A CN112881807A CN 112881807 A CN112881807 A CN 112881807A CN 202110022283 A CN202110022283 A CN 202110022283A CN 112881807 A CN112881807 A CN 112881807A
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 131
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 126
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000005259 measurement Methods 0.000 claims abstract description 24
- 238000012937 correction Methods 0.000 claims abstract description 16
- 239000000523 sample Substances 0.000 claims description 93
- 230000001681 protective effect Effects 0.000 claims description 19
- 230000008439 repair process Effects 0.000 description 9
- 238000004804 winding Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 4
- 238000006731 degradation reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000005284 excitation Effects 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 230000003449 preventive effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
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- 238000010998 test method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
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- G01R1/0416—Connectors, terminals
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Abstract
The invention discloses a measuring tool and a measuring method for a generator rotor loop resistance and a carbon brush loop resistance. The invention discloses a generator rotor loop resistance measuring method, which comprises the following steps: and measuring the resistance of the generator rotor loop by using a micro-ohm resistance measuring instrument. The invention discloses a carbon brush loop resistance measuring method, which comprises the following steps: the method comprises the following steps that firstly, the resistance between two adjacent carbon brush collecting rings is measured and used as a correction resistance for correcting a measurement result; secondly, measuring the sum of the resistance of the carbon brush loop and the correction resistance; and subtracting the result of the correction resistance measured in the first step from the measurement result in the second step to obtain the resistance value of the carbon brush loop. The measuring tool for the resistance of the rotor loop and the resistance of the carbon brush loop of the generator can realize that the current of the micro-ohm resistance measuring instrument forms a loop in the rotor and the voltage of the voltage drop of the rotor loop is correctly picked up. The invention can conveniently and quickly realize the resistance measurement of the rotor loop and the carbon brush loop of the generator.
Description
Technical Field
The invention relates to the field of electricity, in particular to a tool and a method for measuring a generator rotor loop resistance and a carbon brush loop resistance.
Technical Field
The measurement of the resistance of the rotor loop of the generator can judge the health state of the rotor loop, and particularly, compared with historical data, the measurement can accurately judge the degradation trend of the resistance of the rotor loop of the generator, and the measurement comprises the following steps: the change in contact resistance of each contact surface, such as: the contact resistance of the conductive screw and the direct-current resistance of the rotor winding can be changed, and whether the problems of good contact of the conductive screw, turn-to-turn short circuit and the like exist can be judged. The "preventive test protocol for electric Power Equipment" (DL/T596-2005) requires: the period of measurement of the dc resistance of the rotor windings is "overhauled" and will generally not differ by more than 2% from the initial (handover or overhauled) measurement. The general overhaul period of the generator is 5-6 years, obviously, the total life cycle of the generator is measured for about 5-6 times according to the measurement period, the resistance of a rotor loop is in an off-line state most of the time, the overlong measurement period and the discrete type of data measured each time cannot judge whether the degradation trend is correct even if the comparison data does not exceed 2%. For example, 10 and 31 days in 2009, when a unit is started after minor repair of a certain power plant, a conducting screw of a generator rotor loop outgoing line loosens, so that the contact resistance is increased, and the heating burning loss event is caused. The company strictly measures the resistance of a rotor circuit according to the requirements of 'preventive test regulations for electrical equipment' (DL/T5962005), 3 times of overhaul records are shared by 2009, the measurement result of the resistance of the rotor circuit is 1.2% of the factory ratio in the overhaul of 2007, the other two times of measurement data are jumped, the dispersion is large, the measurement data are too few and no rule can be said, and the degradation trend cannot be judged. The actual situation is: although not exceeding the standard requirement of 2%, the trend of growth has appeared without giving sufficient attention, resulting in a tragic training of 110 ten thousand yuan direct economic loss of rotor repair due to the increase of contact resistance and burning of the conductive screws. After the fact, the group company issues 'measures for preventing the conductive bolts of the rotor winding of the generator from being burnt down' specially for the purpose, and the requirements are as follows: the method comprises the steps of large and small repair of a unit, measuring the direct-current resistance of a generator rotor winding, converting the direct-current resistance and the measured data of previous times into the same temperature, wherein the mutual difference cannot be larger than 2%, and more than 1% of reasons to be found are solved. It is in fact technically difficult to measure the resistance of the generator rotor circuit at the moment of minor repair, which is why the "preventive test procedure for electrical equipment" (DL/T5962005) does not require a measurement at the moment of minor repair.
The method for measuring the loop resistance of the generator rotor generally comprises the following steps: during overhaul, after the rotor is drawn out, the annealed copper wires are wound on the positive collector ring and the negative collector ring and used as measuring terminals for connecting a measuring instrument, different contact resistances can be generated by the aid of force and a method for winding the annealed copper wires, the contact resistances can be counted into the resistance of a rotor loop, and a test result is greatly influenced, so that the discrete type of the test result is easily generated, that is, only one simple test data is not more than 2%, and no practical significance is brought to analysis of degradation tendency. What is the technical difficulty in measuring rotor loop resistance at small repairs? Because the rotor is not taken out during minor repair, the brush yoke and the excitation bus of the rotor are not detached, the annealed copper wire cannot be wound, even if the rotor is wound, the force is not enough, a large contact resistance exists, the measured data has no statistical significance, and the data is completely garbage data. Therefore, the current contradiction is how to solve the problem of how to reliably connect the measuring instrument with the collecting ring during the size maintenance.
The carbon brush is the only current path between the collector ring and the excitation loop of the generator rotor loop, thousands of amperes of current need to be connected with the collector ring through the carbon brush, and the rotor is excited through the rotor winding. Sparking and uneven current distribution in the operation of the carbon brush are common problems in the operation and seriously threaten the operation of the generator. Generally, when the problems occur, a maintainer can adjust the pressure and change the carbon brush in an electrified mode, and although the insulating pad is padded and insulating gloves are worn in the adjustment process, safety risks always exist in the electrified operation process. The important reason for generating the uneven pressure and the uneven current distribution is the difference of the carbon brush loop resistance (comprising the carbon brush lead resistance, the carbon brush body resistance and the contact resistance of the carbon brush and the collecting ring), the current regulation of the carbon brush loop resistance has no clear requirement, and the main reason for the non-requirement is that no measuring tool, measuring method and standard of the carbon brush loop resistance exist in a static state (a shutdown state), and the carbon brush loop resistance can only be adjusted by observing the running state in running.
The tool and the corresponding measuring method for measuring the resistance of the generator rotor loop and the resistance of the carbon brush loop conveniently are lacked in reality.
Disclosure of Invention
The invention aims to provide a generator rotor loop resistance and carbon brush loop resistance measuring tool and method which are convenient to use.
The invention discloses a measuring tool for loop resistance of a generator rotor and loop resistance of a carbon brush, which comprises an insulating protective cover, and a voltage probe and a current probe which extend out of the insulating protective cover, wherein the voltage probe is connected with a voltage wiring terminal through a voltage bus bar, the current probe is connected with the current wiring terminal through a current bus bar, the voltage bus bar and the current bus bar are both arranged in the insulating protective cover, and the voltage wiring terminal and the current wiring terminal are both arranged outside the insulating protective cover.
According to the measuring tool for the loop resistance of the generator rotor and the carbon brush loop resistance, the insulating protective cover is cuboid, the voltage probe and the current probe extend out of the front end face of the insulating protective cover, and the voltage wiring terminal and the current wiring terminal are arranged below the bottom face of the insulating protective cover.
The invention relates to a measuring tool for a rotor loop resistance and a carbon brush loop resistance of a generator, wherein a plurality of current probes are arranged, each current probe comprises a current probe head, an outer tube and a spring arranged between the current probe head and the outer tube, the current probe heads of the plurality of current probes are all connected with a current bus bar, and the current bus bar is connected with a current wiring terminal, so that the current probes can stretch along with the radian of the surface of a collecting ring, and the current probes are ensured to be in good contact with the collecting ring.
The invention relates to a generator rotor loop resistance and carbon brush loop resistance measuring tool, wherein a plurality of voltage probes are arranged, each voltage probe comprises a voltage probe head, an outer tube and a spring arranged between the voltage probe head and the outer tube, the voltage probe heads of the voltage probes are all connected with a voltage bus bar, and the voltage bus bar is connected with a voltage wiring terminal, so that the voltage probes can stretch along with the radian of the surface of a collecting ring, and the voltage probes are ensured to be in good contact with the collecting ring.
According to the generator rotor loop resistance and carbon brush loop resistance measuring tool, the contact surfaces of the front ends of the voltage needle head and the current needle head are all hemispherical, and seamless contact with the arc-shaped collecting ring is guaranteed.
The invention discloses a measuring method of generator rotor loop resistance, which uses the measuring tool of generator rotor loop resistance and carbon brush loop resistance, comprising:
respectively detaching a carbon brush from a positive collecting ring and a negative collecting ring of the generator, respectively contacting a voltage probe and a current probe of a measuring tool with the positive collecting ring and the negative collecting ring at the position of the original carbon brush, and connecting a current wire of a micro-ohm resistance measuring instrument to a current wiring terminal of the measuring tool to form a current loop; connecting a voltage wire of the micro-ohm resistance measuring instrument to a voltage wiring terminal of a measuring tool to form a voltage loop;
and measuring the resistance of the generator rotor loop by using a micro-ohm resistance measuring instrument.
The invention discloses a carbon brush loop resistance measuring method, which utilizes a generator rotor loop resistance and a carbon brush loop resistance measuring tool, and comprises the following steps:
the first step is as follows: removing two adjacent carbon brushes on the generator, respectively arranging two measuring tools at the original carbon brush positions, respectively contacting a voltage probe and a current probe of each measuring tool with a carbon brush collecting ring, respectively connecting current lines of a micro-ohm resistance measuring instrument with current connecting terminals of the two measuring tools, respectively connecting voltage lines of the micro-ohm resistance measuring instrument with voltage connecting terminals of the two measuring tools, and measuring resistance between the two adjacent carbon brush collecting rings to serve as correction resistance for correcting a measuring result;
the second step is that: keeping a measuring tool, removing the other measuring tool, installing an original carbon brush, respectively connecting a current line of a micro-ohm resistance measuring instrument to a carbon brush lead and a current wiring terminal of the measuring tool, respectively connecting a voltage line of the micro-ohm resistance measuring instrument to the carbon brush lead and a voltage wiring terminal of the measuring tool, and measuring the sum of a carbon brush loop resistance and a correction resistance;
the third step: subtracting the result of the correction resistance measured in the first step from the measurement result in the second step to obtain the resistance value of the carbon brush loop;
the fourth step: and repeating the first step to the third step, and measuring the resistance values of all carbon brush loops.
The measuring tool for the resistance of the rotor loop and the resistance of the carbon brush loop of the generator can ensure that the micro-ohm resistance measuring instrument is reliably connected with the collector ring of the rotor loop of the generator, and the current of the micro-ohm resistance measuring instrument forms a loop in the rotor and the voltage of the voltage drop of the rotor loop is correctly picked up. The technical scheme of the invention can conveniently and quickly realize the resistance measurement of the rotor loop and the carbon brush loop of the generator.
Drawings
FIG. 1 is an exploded view of the schematic structure of a generator rotor circuit resistance and carbon brush circuit resistance measuring tool according to the present invention;
FIG. 2 is a perspective view of a schematic structure of a generator rotor circuit resistance and carbon brush circuit resistance measuring tool according to the present invention;
FIG. 3 is a schematic diagram of a generator rotor loop resistance measurement method of the present invention;
FIG. 4 is a schematic diagram of a carbon brush loop resistor;
fig. 5 is a schematic diagram of the sum of the measured correction resistances in the carbon brush loop resistance measuring method according to the present invention;
fig. 6 is a schematic diagram of a sum of a measured carbon brush loop resistance and a corrected resistance in the carbon brush loop resistance measuring method according to the present invention;
fig. 7 is an exploded view of the current needle.
Wherein:
1-an insulating protective cover; 2-a voltage terminal; 3-a current terminal; 4-a voltage probe; 5-a current probe; 6-voltage bus; 7-a current bus; 10-measuring tool for loop resistance of generator rotor and carbon brush loop; 301-rotor circuit; 302-positive collector ring; 303-negative collector rings; 401-carbon brush lead resistance; 402-carbon brush body resistance; 403-carbon brush contact resistance; 404-carbon brush loop resistance; 501-correction resistance; 601-carbon brush lead; 701-current pinhead; 702-a spring; 703-outer tube.
Detailed Description
As shown in fig. 1, 2 and 7, the generator rotor loop resistance and carbon brush loop resistance measuring tool 10 of the present invention includes an insulating protective cover 1, and a voltage probe 4 and a current probe 5 extending from the insulating protective cover, wherein the voltage probe 4 is connected to a voltage terminal 2 through a voltage bus bar 6, the current probe 5 is connected to a current terminal 3 through a current bus bar 7, the voltage bus bar and the current bus bar are both disposed in the insulating protective cover, and the voltage terminal and the current terminal are both disposed outside the insulating protective cover.
According to the measuring tool for the loop resistance of the generator rotor and the carbon brush loop resistance, the insulating protective cover is cuboid, the voltage probe and the current probe extend out of the front end face of the insulating protective cover, and the voltage wiring terminal and the current wiring terminal are arranged below the bottom face of the insulating protective cover.
The generator rotor loop resistance and carbon brush loop resistance measuring tool 10 comprises a plurality of current probes, wherein each current probe comprises a current needle 701, an outer tube 703 and a spring 702 arranged between the current needle and the outer tube, the current needles of the plurality of current probes are all connected with a current bus bar, and the current bus bar is connected with a current wiring terminal, so that the current probes can extend and retract along with the radian of the surface of a collecting ring, and the current probes are ensured to be in good contact with the collecting ring.
The voltage probe and the current probe have the same structure.
The generator rotor loop resistance and carbon brush loop resistance measuring tool 10 comprises a plurality of voltage probes, wherein each voltage probe comprises a voltage needle, an outer tube and a spring arranged between the voltage needle and the outer tube, the voltage needles of the voltage probes are all connected with a voltage bus bar, and the voltage bus bar is connected with a voltage wiring terminal, so that the voltage probes can stretch along with the radian of the surface of a collecting ring, and the voltage probes are ensured to be in good contact with the collecting ring.
According to the generator rotor loop resistance and carbon brush loop resistance measuring tool 10, the contact surfaces of the front ends of the voltage needle and the current needle are all hemispherical, and seamless contact with the arc-shaped collecting ring is guaranteed.
Referring to fig. 3, the generator rotor circuit resistance measuring method according to the present invention, using the generator rotor circuit resistance and carbon brush circuit resistance measuring tool according to the present invention, includes:
respectively detaching a carbon brush from a positive collecting ring 302 and a negative collecting ring 303 of the generator, respectively contacting a voltage probe and a current probe of a measuring tool with the positive collecting ring and the negative collecting ring at the position of the original carbon brush, and connecting a current wire of a micro-ohm resistance measuring instrument to a current connecting terminal of the measuring tool to form a current loop; connecting a voltage wire of the micro-ohm resistance measuring instrument to a voltage wiring terminal of a measuring tool to form a voltage loop;
and measuring the resistance of the generator rotor loop by using a micro-ohm resistance measuring instrument.
Referring to fig. 4 and 5, the method for measuring the resistance of the carbon brush circuit according to the present invention, using the tool for measuring the resistance of the rotor circuit and the resistance of the carbon brush circuit of the generator according to the present invention, includes:
the first step is as follows: removing two adjacent carbon brushes on the generator, respectively arranging two measuring tools at the original carbon brush positions, respectively contacting a voltage probe and a current probe of each measuring tool with a carbon brush collecting ring, respectively connecting current lines of a micro-ohm resistance measuring instrument with current connecting terminals of the two measuring tools, respectively connecting voltage lines of the micro-ohm resistance measuring instrument with voltage connecting terminals of the two measuring tools, and measuring resistance between the two adjacent carbon brush collecting rings to serve as correction resistance for correcting a measuring result;
the second step is that: keeping a measuring tool, removing the other measuring tool, installing an original carbon brush, respectively connecting a current line of a micro-ohm resistance measuring instrument to a carbon brush lead and a current wiring terminal of the measuring tool, respectively connecting a voltage line of the micro-ohm resistance measuring instrument to the carbon brush lead and a voltage wiring terminal of the measuring tool, and measuring the sum of a carbon brush loop resistance and a correction resistance;
the third step: subtracting the result of the correction resistance measured in the first step from the measurement result in the second step to obtain the resistance value of the carbon brush loop;
the fourth step: and repeating the first step to the third step, and measuring the resistance values of all carbon brush loops.
The measuring tool for the resistance of the rotor loop and the resistance of the carbon brush loop of the generator can ensure that the micro-ohm resistance measuring instrument is reliably connected with the collector ring of the rotor loop of the generator, and the current of the micro-ohm resistance measuring instrument forms a loop in the rotor and the voltage of the voltage drop of the rotor loop is correctly picked up.
The generator rotor loop resistance and carbon brush loop resistance measuring tool has the same external dimension with the common carbon brush, and can be inserted into the brush holder like the common carbon brush.
The current probes bear the heavy current injection task of the micro-ohm resistance measuring instrument and are connected together through the bus bar, each probe is provided with an independent built-in spring, the contact pressure of the probe and the collecting ring can be adjusted along with the radian of the surface of the collecting ring, and the current probes are ensured to be in good contact with the collecting ring.
The voltage probes are used for picking up the voltage of the micro-ohm resistance measuring instrument and are connected together through the bus bars, each small probe is provided with an independent built-in spring, the contact pressure of the probe and the collecting ring can be adjusted along with the radian of the surface of the collecting ring, and the voltage probes are ensured to be in good contact with the collecting ring.
The current probes bear the heavy current transmission task, and at least the current carrying capacity of 100A needs to be ensured, so that the number of the probes is selected according to the current carrying capacity of the small probes, and the contact surfaces of the probes are hemispherical, so that seamless contact with the arc-shaped collecting ring is ensured.
The voltage probes are used for picking up voltage, so that the number of the small probes can be ensured to reliably pick up the voltage, and the contact surfaces of the probes are hemispherical, so that seamless contact with the arc-shaped collecting ring is ensured.
The current probe is connected with the current bus bar and the current wiring terminal, and can be connected with the current output of the micro-ohm resistance measuring instrument.
The voltage probe is connected with the voltage bus bar and is connected with the voltage wiring terminal, and can be connected with a voltage pickup of the micro-ohm resistance measuring instrument.
The current probe and the voltage probe are protected by an insulating protective cover and cannot be connected with the carbon brush holder.
The measuring tool provided by the embodiment of the application is a channel for communicating a current path and voltage pickup between a micro-ohm resistance measuring instrument and a collecting ring, so that the resistance measurement of a generator rotor loop becomes possible under the condition that a brush holder and an excitation busbar are not detached, namely the measurement during minor repair, and the possibility is provided for the measurement of the resistance of a carbon brush loop.
The specific method for measuring the resistance of the generator rotor loop 301 comprises the following steps:
as shown in fig. 3, a carbon brush is removed from each of the positive collector ring 302 and the negative collector ring 303 of the generator, the generator rotor loop resistance and carbon brush loop resistance measuring tool of the present invention is replaced, and the current line of the micro ohm resistance measuring instrument is connected to the current connecting terminal 3 of the generator rotor loop resistance and carbon brush loop resistance measuring tool 10 of the present invention to form a current loop; the voltage line of the microohm resistance measuring instrument is connected to the voltage terminal 2 of the measuring tool 10 to form a voltage loop. The resistance of the generator rotor loop 301 is measured according to the measuring method of the micro-ohm resistance measuring instrument, manual winding of soft wiring and disassembly of a brush holder and an excitation bus are not needed, and the resistance of the generator rotor loop 301 can be measured very conveniently during minor repair.
The specific method for measuring the carbon brush loop resistance 404 is as follows:
as shown in fig. 4, the carbon brush loop resistor 404 is composed of a carbon brush lead resistor 401, a carbon brush body resistor 402, and a contact resistor 403 of a contact surface of the carbon brush and the slip ring, and the sum of the three resistors is measured during measurement. The carbon brush lead resistance 401 is generally constant, the carbon brush body resistance 402 changes along with the shortening of the carbon brush in operation, and the carbon brush contact resistance 403 is related to the pressure of the carbon brush, the material and the contact area of the carbon brush and the contact surface of the collecting ring. The measuring resistor needs a current loop and a voltage loop, and it can be seen from the figure that the carbon brush is in contact with the surface of the collecting ring, and the collecting ring cannot be connected with a current line and a voltage line of the microohm resistance measuring instrument, so that the carbon brush loop resistance 404 cannot be directly measured, and the carbon brush loop resistance 404 can be measured by an indirect method by using the generator rotor loop resistance and carbon brush loop resistance measuring tool 10 of the invention.
First, two adjacent carbon brushes are replaced by the generator rotor loop resistance and carbon brush loop resistance measuring tool 10 of the present invention, as shown in fig. 5, the current lines of the micro-ohm resistance measuring instrument are respectively connected to the current connecting terminals 3 of the two measuring tool 10 for measuring the generator rotor loop resistance and the carbon brush loop resistance, the voltage lines of the micro-ohm resistance measuring instrument are respectively connected to the two measuring tool voltage connecting terminals 2, and the resistance between the two adjacent carbon brush collecting rings is measured as a correction resistance 501 for correcting the measurement result.
In the second step, a carbon brush and a measuring tool are retained, as shown in fig. 6, the current line of the micro-ohm resistance measuring instrument is connected to the carbon brush lead 601 and the current terminal 3 of the measuring tool, respectively, and the voltage line of the micro-ohm resistance measuring instrument is connected to the carbon brush lead 601 and the voltage terminal 2 of the measuring tool, respectively, and the measured result is the sum of the carbon brush loop resistance 404 and the correction resistance 501.
And thirdly, subtracting the result of the corrected resistance 501 measured in the first step from the result of the measurement in the second step to obtain the desired carbon brush loop resistance 404.
And fourthly, repeating the first step to the third step, and measuring all carbon brush loop resistances 404.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. The utility model provides a generator rotor loop resistance and carbon brush loop resistance measuring tool, its characterized in that, including insulating safety cover and by voltage probe, the current probe that stretches out in the insulating safety cover, voltage probe passes through the voltage busbar and is connected with voltage wiring terminal, and the current probe passes through the current busbar and is connected with current wiring terminal, and voltage busbar and current busbar all set up in insulating safety cover, voltage wiring terminal, current wiring terminal all set up outside insulating safety cover.
2. The generator rotor loop resistance and carbon brush loop resistance measuring tool according to claim 1, wherein the insulating protective cover is rectangular, the voltage probe and the current probe extend from a front end face of the insulating protective cover, and the voltage terminal and the current terminal are disposed below a bottom face of the insulating protective cover.
3. The generator rotor loop resistance and carbon brush loop resistance measuring tool according to claim 2, wherein the current probe comprises a plurality of current probes, each current probe comprises a current pin, an outer tube and a spring arranged between the current pin and the outer tube, the current pins of the plurality of current probes are connected with a current bus bar, and the current bus bar is connected with a current terminal, so that the current probes can extend and retract along with the radian of the surface of the collector ring, and good contact between the current probes and the collector ring is ensured.
4. The generator rotor loop resistance and carbon brush loop resistance measuring tool of claim 3, wherein the voltage probes are plural, each voltage probe comprises a voltage probe head, an outer tube and a spring installed between the voltage probe head and the outer tube, the voltage probe heads of the plural voltage probes are all connected with a voltage bus bar, and the voltage bus bar is connected with a voltage wiring terminal, so that the voltage probes can extend and contract along with the radian of the surface of the collecting ring, and good contact between the voltage probes and the collecting ring is ensured.
5. The generator rotor loop resistance and carbon brush loop resistance measuring tool of claim 4, wherein the front contact surfaces of the voltage pins and the current pins are hemispherical to ensure seamless contact with the arc-shaped collecting rings.
6. A generator rotor circuit resistance measuring method, characterized in that the generator rotor circuit resistance and carbon brush circuit resistance measuring tool according to any one of claims 1 to 5 is used, and the method comprises the following steps:
respectively detaching a carbon brush from a positive collecting ring and a negative collecting ring of the generator, respectively contacting a voltage probe and a current probe of a measuring tool with the positive collecting ring and the negative collecting ring at the position of the original carbon brush, and connecting a current wire of a micro-ohm resistance measuring instrument to a current wiring terminal of the measuring tool to form a current loop; connecting a voltage wire of the micro-ohm resistance measuring instrument to a voltage wiring terminal of a measuring tool to form a voltage loop;
and measuring the resistance of the generator rotor loop by using a micro-ohm resistance measuring instrument.
7. A carbon brush circuit resistance measuring method, using the generator rotor circuit resistance and carbon brush circuit resistance measuring tool according to any one of claims 1 to 5, comprising:
the first step is as follows: removing two adjacent carbon brushes on the generator, respectively arranging two measuring tools at the original carbon brush positions, respectively contacting a voltage probe and a current probe of each measuring tool with a carbon brush collecting ring, respectively connecting current lines of a micro-ohm resistance measuring instrument with current connecting terminals of the two measuring tools, respectively connecting voltage lines of the micro-ohm resistance measuring instrument with voltage connecting terminals of the two measuring tools, and measuring resistance between the two adjacent carbon brush collecting rings to serve as correction resistance for correcting a measuring result;
the second step is that: keeping a measuring tool, removing the other measuring tool, installing an original carbon brush, respectively connecting a current line of a micro-ohm resistance measuring instrument to a carbon brush lead and a current wiring terminal of the measuring tool, respectively connecting a voltage line of the micro-ohm resistance measuring instrument to the carbon brush lead and a voltage wiring terminal of the measuring tool, and measuring the sum of a carbon brush loop resistance and a correction resistance;
the third step: subtracting the result of the correction resistance measured in the first step from the measurement result in the second step to obtain the resistance value of the carbon brush loop;
the fourth step: and repeating the first step to the third step, and measuring the resistance values of all carbon brush loops.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110022283.XA CN112881807B (en) | 2021-01-08 | 2021-01-08 | Tool and method for measuring loop resistance and carbon brush loop resistance of generator rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110022283.XA CN112881807B (en) | 2021-01-08 | 2021-01-08 | Tool and method for measuring loop resistance and carbon brush loop resistance of generator rotor |
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| Publication Number | Publication Date |
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| CN112881807A true CN112881807A (en) | 2021-06-01 |
| CN112881807B CN112881807B (en) | 2023-11-14 |
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| CN202110022283.XA Active CN112881807B (en) | 2021-01-08 | 2021-01-08 | Tool and method for measuring loop resistance and carbon brush loop resistance of generator rotor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114421249A (en) * | 2022-01-04 | 2022-04-29 | 大唐长春第二热电有限责任公司 | Carbon brush and brush holder device with intelligence measurement and control function |
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