CN113933668A - Generator rotor insulation detection method and generator stator fault test method - Google Patents
Generator rotor insulation detection method and generator stator fault test method Download PDFInfo
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- CN113933668A CN113933668A CN202111340306.8A CN202111340306A CN113933668A CN 113933668 A CN113933668 A CN 113933668A CN 202111340306 A CN202111340306 A CN 202111340306A CN 113933668 A CN113933668 A CN 113933668A
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- 238000001514 detection method Methods 0.000 title claims abstract description 93
- 238000009413 insulation Methods 0.000 title claims abstract description 49
- 238000010998 test method Methods 0.000 title abstract description 4
- 230000001960 triggered effect Effects 0.000 claims abstract description 24
- 238000012360 testing method Methods 0.000 claims description 17
- 238000002474 experimental method Methods 0.000 claims description 4
- 238000005498 polishing Methods 0.000 claims description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical group [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 2
- 238000000034 method Methods 0.000 description 15
- 239000012774 insulation material Substances 0.000 description 3
- 238000003475 lamination Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 244000137852 Petrea volubilis Species 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/346—Testing of armature or field windings
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Abstract
The invention relates to a generator rotor insulation detection method and a generator stator fault test method. The generator rotor insulation detection method comprises the following steps: a first insulating layer, a conducting layer and a second insulating layer are sequentially arranged between two end parts of the rotor and the corresponding shaft lifting device; the two ends of the rotor are respectively provided with a detection system, one end of the detection system is electrically connected with the corresponding conducting layer, and the corresponding pair wheel and the corresponding shaft lifting device are respectively electrically connected with the other end of the detection system; if the detection system corresponding to one end part is triggered, the end part is conducted with the corresponding conducting layer, and/or the shaft lifter corresponding to the end part is conducted with the conducting layer. If the detecting system of a certain end is triggered in this application, it is shown that at least one of the first insulating layer and the second insulating layer of the end is damaged, and therefore the rotor of which end has a fault can be timely judged according to the state of the detecting system, so that a fault point is quickly determined, the fault detection time is saved, and the time and the labor for lifting the two ends of the rotor are saved.
Description
Technical Field
The invention relates to the technical field of electrical maintenance, in particular to a generator rotor insulation detection method and a generator stator fault test method.
Background
At present, when the generator rotor is not pulled out, a technique of entering an air gap between a stator and a rotor by using a small robot and performing an ELCID (Electromagnetic Core interference Detector) test is generally used. In this state, the rotor shaft of the generator needs to be insulated, so that when the stator is excited, the two ends of the rotor shaft are grounded to form induced current, thereby influencing the probe of the ELICD test. The common insulation processing method is to put insulation material between the paired wheel and the shaft lifter, however, when the ground insulation of the rotor is measured to be 0, it cannot be judged which end of the rotor is conducted with the ground, only the two ends of the rotor can be lifted in sequence for inspection, and the insulation material at the fault end is replaced, so that the whole detection process is time-consuming.
Disclosure of Invention
Therefore, it is necessary to provide a generator rotor insulation detection method for the technical problem that when the rotor is 0 with respect to the ground insulation, which end of the rotor is not conductive to the ground, only two ends of the rotor can be sequentially lifted for inspection, and the insulation material of the fault end is replaced, so that the whole detection process consumes a long time.
A generator rotor insulation detection method comprises the following steps:
s100, sequentially placing a first insulating layer, a conducting layer and a second insulating layer from top to bottom between two end parts of a rotor and corresponding shaft lifting devices;
s200, arranging two detection systems which correspond to two ends of the rotor one by one, wherein in the detection system corresponding to each end, one end of each detection system is electrically connected with the corresponding conducting layer, and the corresponding one end of the rotor and the corresponding shaft lifting device are respectively electrically connected with the other end of the detection system;
s300, if the detection system corresponding to one end part is triggered, the end part is conducted with the corresponding conducting layer, and/or the shaft lifter corresponding to the end part is conducted with the conducting layer.
In one embodiment, S300 is followed by:
s400, hoisting the end part, corresponding to the triggered detection system, of the rotor through a lifting rope;
s500, observing whether the first insulating layer and the second insulating layer are broken.
In one embodiment, in S200, magnetic suction heads are respectively disposed at two ends of the rotor and the shaft lifter, and are electrically connected to the other end of the detection system through the magnetic suction heads.
In one embodiment, an alarm is arranged on the detection system, and when the detection system is triggered, the alarm gives an alarm.
In one embodiment, the first and second insulating layers are green-shelled paper.
In one embodiment, the conductive layer is a foil paper.
In one embodiment, before S100, the method further includes:
s110, removing a connecting structure between the rotor and the stator, and supporting two ends of the rotor through the shaft lifting device;
and S120, respectively hoisting the two ends of the rotor through hoisting ropes.
The invention also provides a generator stator fault testing method which can solve at least one technical problem.
Before a stator fault test experiment, the generator rotor insulation detection method is used for carrying out insulation treatment and detection on the rotor positioned in the stator.
In one embodiment, S500 is followed by:
s600, judging the position of the bulge causing the damage according to the damage.
In one embodiment, S600 further includes:
s700, polishing the protrusions;
s800, replacing the damaged first insulating layer or the second insulating layer;
s900, detaching the lifting rope.
Has the advantages that:
the embodiment of the invention provides a generator rotor insulation detection method, which comprises the following steps:
s100, sequentially placing a first insulating layer, a conducting layer and a second insulating layer from top to bottom between two end parts of a rotor and corresponding shaft lifting devices;
s200, arranging two detection systems which correspond to two ends of the rotor one by one, wherein in the detection system corresponding to each end, one end of each detection system is electrically connected with the corresponding conducting layer, and the corresponding pair wheel and the corresponding shaft lifting device are respectively and electrically connected to the other end of the detection system;
s300, if the detection system corresponding to one end part is triggered, the end part is conducted with the corresponding conducting layer, and/or the shaft lifter corresponding to the end part is conducted with the conducting layer.
In the application, the first insulating layer, the conducting layer and the second insulating layer are arranged between the two end parts of the rotor and the corresponding shaft lifting devices, and the detection system is arranged, so that if the first insulating layer is damaged, the rotor is conducted with the conducting layer, and the detection system is triggered; if the second insulating layer is damaged, the rotor is communicated with the shaft lifter, and the detection system is triggered; if the first insulating layer and the second insulating layer are damaged, the conducting layer is conducted with the rotor and the shaft lifter, and the detection system is triggered. Therefore, the triggering condition of the detection system of the corresponding end can be determined, and if the detection system of a certain end is triggered, the situation indicates that any one of the three conditions possibly occurs at the end, namely that at least one of the first insulating layer and the second insulating layer is damaged. The insulation layer is damaged due to the fact that the bottom end of the pair wheel or the bottom wall of the shaft lifter is provided with the bulge, once one insulation layer is punctured by the bulge due to the heavy weight of the rotor, the other insulation layer is also punctured by the bulge, and as long as one of the three conditions occurs, the corresponding end of the rotor is conducted with the ground. Therefore, which end of the rotor has a fault can be timely judged according to the state of the detection system, so that a fault point is quickly determined, the fault detection time is saved, the time and labor for hoisting the two ends of the rotor are saved, and the risk of conducting the rotor and the ground in the later period is reduced.
The embodiment of the invention also provides a generator stator fault testing method, and before a stator fault testing experiment, the generator rotor insulation detection method is used for carrying out insulation detection on the rotor positioned in the stator. The method can solve at least one technical problem.
Drawings
FIG. 1 is a flow chart of a generator rotor insulation detection method provided by the present invention;
FIG. 2 is a schematic view of a rotor and a stator in the method for detecting insulation of a generator rotor according to the present invention;
FIG. 3 is a cross-sectional view taken at A in FIG. 2;
fig. 4 is a schematic view of an electrical connection between a detection system and a corresponding end of a rotor in the generator rotor insulation detection method provided by the present invention.
Reference numerals: 100-a rotor; 110-a pair of wheels; 120-a shaft lifter; 121-grooves; 210-a first insulating layer; 220-a second insulating layer; 230-a conductive layer; 300-a detection system; 310-a magnetic tip; 320-a loudspeaker; 330-indicator light; 400-stator.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Referring to fig. 1 to 4, fig. 1 is a flow chart of a generator rotor insulation detection method provided by the present invention;
FIG. 2 is a schematic view of a rotor and a stator in the method for detecting insulation of a generator rotor according to the present invention; FIG. 3 is a cross-sectional view taken at A in FIG. 2; fig. 4 is a schematic view of an electrical connection between a detection system and a corresponding end of a rotor in the generator rotor insulation detection method provided by the present invention. In the conventional method for detecting insulation between the rotor 100 and the ground, since only one insulation layer is provided between the pair of wheels 110 and the corresponding shaft lifter 120, when the rotor 100 is conducted to the ground, it cannot be determined which end of the insulation layer is damaged, and it is necessary to sequentially lift and detect both ends of the rotor 100 and replace the insulation layer. Since the rotor 100 is heavy, the risk is high and the time is long in the process of sequentially lifting the two ends of the rotor 100. Therefore, the invention provides a method for detecting insulation of the generator rotor 100, which can quickly determine a fault point.
An embodiment of the present invention provides a method for detecting insulation of a generator rotor 100, including the following steps:
s100 a first insulating layer 210, a conductive layer 230 and a second insulating layer 220 are sequentially disposed from top to bottom between two ends of the rotor 100 and the corresponding shaft lifter 120.
Specifically, the two ends of the rotor 100 are respectively provided with the pair wheel 110, the shaft lifter 120 is provided with a groove 121 corresponding to the pair wheel 110, and the bottom end of the pair wheel 110 is clamped in the corresponding groove 121, so that the shaft lifter 120 can stably support the rotor 100, and the rotor 100 is prevented from rotating and colliding with the stator 400. The first insulating layer 210, the conductive layer 230 and the second insulating layer 220 are sequentially disposed in the pair wheel 110 and the corresponding groove 121 from top to bottom, so that the first insulating layer 210, the conductive layer 230 and the second insulating layer 220 can be limited, the pair wheel 110 and the corresponding conductive layer 230 can be isolated by the first insulating layer 210 and the second insulating layer 220, the axle lifter 120 and the corresponding conductive layer 230 can be isolated, the pair wheel 110 and the corresponding axle lifter 120 are isolated, and two ends of the rotor 100 are isolated from the ground.
Further, the lower side of the second insulating layer 220 is attached to the bottom wall of the groove 121, the upper side of the first insulating layer 210 is attached to the lower side of the wheel 110, and the first insulating layer 210, the conductive layer 230 and the second insulating layer 220 are attached to each other, so that good insulating effects are provided between the wheel 110 and the axle lifter 120 and the corresponding conductive layer 230.
The gap between the rotor 100 and the stator 400 is generally small, and further, the first insulating layer 210, the conductive layer 230 and the second insulating layer 220 are made of thin materials, so that the height of the rotor 100 is substantially unchanged after the first insulating layer 210, the conductive layer 230 and the second insulating layer 220 are placed in the pair of wheels 110 and the corresponding grooves 121, thereby reducing the risk of collision between the rotor 100 and the stator 400.
S200, two detecting systems 300 corresponding to two ends of the rotor 100 are disposed, in the detecting system 300 corresponding to each end, one end of the detecting system 300 is electrically connected to the corresponding conductive layer 230, and the corresponding one end of the rotor 100 and the shaft lifter 120 are respectively electrically connected to the other end of the detecting system 300.
Specifically, one end of the detection system 300 is connected to the corresponding conductive layer 230, and the corresponding pair wheel 110 and the axle lifter 120 are electrically connected to the other end of the detection system 300 respectively. Since the wheel 110 and the axle lifter 120 are insulated from the conductive layer 230 by the first insulating layer 210 and the second insulating layer 220, respectively, when the first insulating layer 210 and the second insulating layer 220 are not broken and the wheel 110 and the axle lifter 120 are not conducted to the corresponding conductive layer 230, the detection system 300 cannot form a closed loop, and at this time, the detection system 300 does not respond.
S300, if the detection system 300 corresponding to one end is triggered, the end is conducted with the corresponding conductive layer 230, and/or the shaft lifter 120 corresponding to the end is conducted with the conductive layer 230.
Specifically, if the first insulating layer 210 is damaged, the pair of wheels 110 corresponding to the end portion is conducted with the conductive layer 230, and the detection system 300 at the end portion forms a closed loop and is triggered; if the second insulating layer 220 is damaged, the corresponding lift pin 120 at the end is conducted with the conductive layer 230, and the detection system 300 at the end forms a closed loop and is triggered; if the first insulating layer 210 and the second insulating layer 220 are both damaged, the conductive layer 230 at the end is conducted with the corresponding pair wheel 110 and the axle lifter 120, and the detection system 300 at the end forms a closed loop and is triggered. Therefore, it can be determined according to the triggering condition of the detection system 300 at the corresponding end, and if the detection system 300 at a certain end is triggered, it indicates that any one of the above three conditions may occur at the end, i.e. at least one of the first insulating layer 210 and the second insulating layer 220 may be damaged.
The reason why the first insulating layer 210 or the second insulating layer 220 is damaged is that the bottom end of the wheel 110 or the bottom wall of the groove 121 of the shaft lifter 120 has a protrusion, and when the side having the protrusion is attached to the first insulating layer 210 or the second insulating layer 220, since the first insulating layer 210 or the second insulating layer 220 is made of a thin material and the rotor 100 is heavy, the insulating layer attached to the protrusion may be pierced by the horse, and the other insulating layer may be pierced.
If the protrusion is large, the first insulating layer 210, the second insulating layer 220 and the conductive layer 230 are simultaneously pierced, and the pair wheel 110 and the axle lifter 120 at the corresponding end are conducted; if the protrusions are moderate, the insulating layer attached to the protrusions is firstly pierced, then the conductive layer 230 and the other insulating layer are also pierced later, and the wheel pair 110 at the corresponding end is also communicated with the corresponding axle lifter 120; if the protrusions are small, the insulating layer attached to the protrusions is pierced first, and the conductive layer 230 and the other insulating layer are at risk of being pierced, and as time goes on, the conductive layer 230 and the other insulating layer at the corresponding ends are also pierced finally, that is, the corresponding pair wheel 110 is also conducted with the corresponding shaft lifter 120 finally. Therefore, as long as one of the three situations occurs, the corresponding ends of the rotor 100 may all be connected to the shaft lifter 120, and the shaft lifter 120 is placed on the ground, so that the corresponding ends of the rotor 100 may all be connected to the ground, and it can be determined in time according to the state of the detection system 300 which end of the rotor 100 has a fault, thereby quickly determining a fault point, saving the time for detecting the fault, saving the time and manpower for lifting the two ends of the rotor 100, and reducing the risk of later-stage connection between the rotor 100 and the ground.
Referring to fig. 1 and 4, in one embodiment, after S300, the method further includes:
s400 lifts an end of the rotor 100 corresponding to the triggered detection system 300 through the hoist rope.
Specifically, when the detection system 300 is triggered, it is then quickly determined which end of the rotor 100 has a fault. Since both end portions of the rotor 100 are respectively protruded outside the stator 400, the end portion of the rotor 100 having a failure is lifted by a lifting rope, and then the first insulating layer 210, the conductive layer 230, and the second insulating layer 220 are sequentially taken out. It should be noted that, since the gap between the rotor 100 and the inner cavity of the stator 400 is small, the height at which the lifting rope lifts the rotor 100 is small, and the rotor 100 does not collide with the stator 400.
S500, the first insulating layer 210 and the second insulating layer 220 are observed for the presence or absence of breakage.
Specifically, whether the first insulating layer 210 and the second insulating layer 220 are damaged or not is observed in sequence, so that the reason for triggering the corresponding end detection system 300 is judged, the damaged insulating layers can be replaced in time, and the two ends of the rotor 100 are respectively insulated from the ground.
With continued reference to fig. 1 and 4, in one embodiment, in S200, the magnetic attraction heads 310 are respectively disposed at two ends of the rotor 100 and the shaft lifter 120, and are electrically connected to the other end of the detection system 300 through the magnetic attraction heads 310.
Specifically, the magnetic attraction heads 310 are respectively arranged on the upper end of the pair of wheels 110 and the axle lifter 120, and since the magnetic attraction heads 310 are magnetic and can conduct electricity, the magnetic attraction heads 310 can be stably attached to the pair of wheels 110 and the axle lifter 120, and can be electrically connected with the other end of the detection system 300 through the other end of the detection system 300, so that the corresponding pair of wheels 110 and the axle lifter 120 are respectively and stably electrically connected with the other end of the detection system 300 through the corresponding magnetic attraction heads 310.
Referring to fig. 4, in one embodiment, an alarm is provided on the detection system 300, and the alarm alarms when the detection system 300 is triggered.
Specifically, the alarm is a horn 320, and when the detection system 300 is triggered, the horn 320 sounds a whistle, so that an operator can be informed in time, and the operator can handle the whistle in time.
In another embodiment, the alarm is an indicator light 330, and when the detection system 300 is triggered, the indicator light 330 is turned on, so that the operator can be reminded in time to facilitate timely handling by the operator.
In one embodiment, the alarm comprises a speaker 320 and an indicator 330, wherein the speaker 320 is connected in parallel with the indicator 330, and when the detection system 300 is triggered, the indicator 330 is turned on and the speaker 320 sounds a whistle, so that the operator can be informed and reminded in time, and the operator can deal with the whistle in time.
Referring to fig. 1, 2 and 3, in one embodiment, the first insulating layer 210 and the second insulating layer 220 are grey paper.
Specifically, the thickness of blue or green shell paper is 0.1 ~ 0.3 millimeter to can reduce rotor 100 and collide with stator 400 because of the lifting, simultaneously, blue or green shell paper is the higher paper that does insulating material and use of mechanical strength, thereby can be stable play isolated effect.
With continued reference to fig. 1, 2, and 3, in one embodiment, the conductive layer 230 is a foil paper.
Specifically, the thickness of the tin foil is 0.2 mm or less and is a conductor, so that the collision of the rotor 100 with the stator 400 due to lifting can be reduced.
Referring to fig. 1 and 2, in an embodiment, before S100, the method further includes:
s110 removes the connection structure between the rotor 100 and the stator 400, and supports both ends of the rotor 100 by the shaft lifter 120.
Specifically, the upper end covers and the upper shoes on both sides of the generator are removed, and the lower end covers and the lower shoes are replaced with the shaft lifter 120, so that the pair of wheels 110 on both ends of the rotor 100 are stably supported by the shaft lifter 120.
S120 respectively hoisting both ends of the rotor 100 by a hoist rope.
Specifically, the suspension rope is sleeved at the journal of one end of the rotor 100, then the current end of the rotor 100 is lifted, so that the first insulating layer 210, the conductive layer 230 and the second insulating layer 220 can be sequentially placed in the groove 121 of the shaft lifter 120 at the corresponding end from top to bottom, and then the suspension rope at the end of the rotor 100 is removed, so that the pair of wheels 110 can abut against the first insulating layer 210 in the groove 121. Then the lifting rope is sleeved at the journal of the other end of the rotor 100, and the setting process is the same as that of one end of the rotor 100, so the description is omitted.
Referring to fig. 1-4, in one embodiment, before the fault test of the stator 400, the insulation of the rotor 100 inside the stator 400 is tested and processed by the insulation testing method of the generator rotor 100 described above.
Specifically, when the stator 400 core fault is detected, an ELCID test is generally adopted, the ELCID test is based on a closed loop ampere-times rule, when two adjacent teeth in the stator 400 move through a CHATTOCK magnetic potentiometer, a magnetic potential difference between the two teeth is measured, when an annular lamination has an insulation defect, a fault current is generated between the annular lamination, and the ELCID test can determine whether a short circuit between stator 400 core pieces exists or not by extracting a fault current component intersecting with an excitation magnetic flux according to the magnitude of the fault current component. However, when the rotor 100 is conducted to the ground to form an induced current, an induced magnetic field formed by the induced current affects the probe of the eldcd test, and therefore, it is necessary to insulate the shaft of the generator rotor 100.
According to the insulation detection method for the generator rotor 100, the rotor 100 in the stator 400 is subjected to insulation treatment and detection, and which end of the rotor 100 has a fault can be timely judged according to the state of the detection system 300, so that the fault point can be quickly determined, the fault detection time is saved, the time and labor for lifting the two ends of the rotor 100 are saved, the risk is reduced, the fault current generated between the laminations can be accurately acquired, and whether the short circuit between the iron chips of the stator 400 exists is judged.
Referring to fig. 1, 2 and 4, in one embodiment, after S500, the method further includes:
s600, judging the position of the bulge causing the damage through the damage.
Specifically, since the rotor 100 is heavy, once the bottom side of the wheel 110 or the bottom wall of the groove 121 has a protrusion, the first insulation layer 210 and the second insulation layer 220 are eventually punctured, causing damage. Therefore, if the first insulating layer 210 is broken at the faulty end of the rotor 100, it indicates that the bottom side of the corresponding pair of wheels 110 may have a protrusion; if the second insulating layer 220 is damaged, it means that the bottom wall of the corresponding groove 121 may have a protrusion; if both the first insulation layer 210 and the second insulation layer 220 are broken, there may be a protrusion on both the bottom side of the wheel 110 and the bottom wall of the groove 121.
Referring to fig. 1 and 2, in one embodiment, after S600, the method further includes:
s700, polishing the protrusions.
Specifically, after the protrusion position is determined by the damage condition of the first insulating layer 210 and the second insulating layer 220, the protrusion is polished by sand paper or the like, so that the protrusion is prevented from puncturing the first insulating layer 210 or the second insulating layer 220 again.
S800 replace the damaged first insulating layer 210 or second insulating layer 220.
Specifically, the damaged insulating layer is replaced, and the complete insulating layer is reserved, so that the material is saved.
S900, removing the lifting rope.
Specifically, the lifting rope arranged at the fault end on the rotor 100 is removed, and the corresponding end of the rotor 100 is clamped into the groove 121 again, so that the two ends of the rotor 100 are stably supported by the shaft lifter 120, and the fault test experiment of the stator 400 is facilitated.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A generator rotor insulation detection method is characterized by comprising the following steps:
s100, sequentially placing a first insulating layer, a conducting layer and a second insulating layer from top to bottom between two end parts of a rotor and corresponding shaft lifting devices;
s200, arranging two detection systems which correspond to two ends of the rotor one by one, wherein in the detection system corresponding to each end, one end of each detection system is electrically connected with the corresponding conducting layer, and the corresponding one end of the rotor and the corresponding shaft lifting device are respectively electrically connected with the other end of the detection system;
s300, if the detection system corresponding to one end part is triggered, the end part is conducted with the corresponding conducting layer, and/or the shaft lifter corresponding to the end part is conducted with the conducting layer.
2. The generator rotor insulation detection method of claim 1, further comprising, after S300:
s400, hoisting the end part, corresponding to the triggered detection system, of the rotor through a lifting rope;
s500, observing whether the first insulating layer and the second insulating layer are broken.
3. The generator rotor insulation detection method of claim 2, wherein in S200, magnetic suction heads are respectively disposed at two ends of the rotor and the shaft lifter, and are electrically connected to the other end of the detection system through the magnetic suction heads.
4. The generator rotor insulation detection method according to claim 2, characterized in that an alarm is arranged on the detection system, and when the detection system is triggered, the alarm gives an alarm.
5. The generator rotor insulation detection method of claim 2, wherein the first and second insulation layers are green-shelled paper.
6. The generator rotor insulation detection method of claim 2, wherein the conductive layer is tin foil paper.
7. The generator rotor insulation detection method of claim 2, further comprising, before S100:
s110, removing a connecting structure between the rotor and the stator, and supporting two ends of the rotor through the shaft lifting device;
and S120, respectively hoisting the two ends of the rotor through hoisting ropes.
8. A generator stator fault testing method, characterized in that before a stator fault testing experiment, the insulation treatment and detection are carried out on the rotor positioned in the stator by using the generator rotor insulation detection method of any one of claims 1 to 7.
9. The generator stator fault testing method of claim 8, further comprising, after S500:
s600, judging the position of the bulge causing the damage according to the damage.
10. The generator stator fault testing method of claim 9, further comprising, after S600:
s700, polishing the protrusions;
s800, replacing the damaged first insulating layer or the second insulating layer;
s900, detaching the lifting rope.
Priority Applications (1)
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|---|---|
| CN113933668B (en) | 2024-05-10 |
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