CN113933668B - 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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- CN113933668B CN113933668B CN202111340306.8A CN202111340306A CN113933668B CN 113933668 B CN113933668 B CN 113933668B CN 202111340306 A CN202111340306 A CN 202111340306A CN 113933668 B CN113933668 B CN 113933668B
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- 238000001514 detection method Methods 0.000 title claims abstract description 84
- 238000009413 insulation Methods 0.000 title claims abstract description 38
- 238000010998 test method Methods 0.000 title abstract description 4
- 238000000034 method Methods 0.000 claims abstract description 35
- 230000001960 triggered effect Effects 0.000 claims abstract description 24
- 238000012360 testing method Methods 0.000 claims description 16
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical group [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 4
- 238000005498 polishing Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 239000012774 insulation material Substances 0.000 description 3
- 238000003475 lamination Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
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- 238000002474 experimental method Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
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- 238000007796 conventional 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 application relates to a generator rotor insulation detection method and a generator stator fault test method. The method for detecting the insulation of the generator rotor comprises the following steps: a first insulating layer, a conductive layer and a second insulating layer are sequentially arranged between two end parts of the rotor and the corresponding shaft lifter; 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 conductive layer, and the corresponding wheel pair and the shaft lifter are respectively electrically connected with the other end of the detection system; if the detection system corresponding to one end is triggered, the end is conducted with the corresponding conductive layer, and/or the shaft lifter corresponding to the end is conducted with the conductive layer. In the application, if the detection system at one end is triggered, at least one of the first insulating layer and the second insulating layer at the end is damaged, so that the rotor at which one end has faults can be timely judged according to the state of the detection system, thereby quickly determining the fault point, saving the fault detection time, and saving the time and labor for lifting the two ends of the rotor.
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, a small robot is generally used to enter an air gap between a stator and a rotor under the condition that a generator rotor is not extracted, and a technology for executing an ELCID (Electromagnetic Core Imperfection Detector electromagnetic core fault detection) test is started to be applied. In this state, it is necessary to insulate the rotor shaft of the generator, and the induced current is prevented from being formed by grounding both ends of the rotor shaft when exciting the stator, thereby affecting the probe for ELICD test. The common insulation treatment method is that an insulation material is placed between the counter wheel and the shaft lifter, however, when the insulation of the rotor to the ground is measured to be 0, the conduction of which end of the rotor to the ground cannot be judged, the two ends of the rotor can only be lifted up in sequence for inspection, the insulation material of the fault end is replaced, and the whole detection process takes a long time.
Disclosure of Invention
Based on this, it is necessary to provide a method for detecting insulation of a rotor of a generator, which is necessary to solve the technical problems that the insulation to ground of the rotor is 0, which end of the rotor is conducted to ground, and only two ends of the rotor can be sequentially lifted for inspection, and the insulation material of the failure end is replaced, and the whole detection process takes a long time.
A method for detecting insulation of a generator rotor comprises the following steps:
S100, a first insulating layer, a conductive layer and a second insulating layer are sequentially arranged between two end parts of a rotor and corresponding shaft lifters from top to bottom;
S200, arranging two detection systems corresponding to two ends of the rotor one by one, wherein in the detection system corresponding to each end, one end of the detection system is electrically connected with the corresponding conductive layer, and one end of the corresponding rotor and the shaft lifter are respectively electrically connected with the other end of the detection system;
S300, if the detection system corresponding to one of the end portions is triggered, the end portion is conducted with the corresponding conductive layer, and/or the shaft lifter corresponding to the end portion is conducted with the conductive layer.
In one embodiment, S300 further comprises:
s400, hoisting the end part, corresponding to the triggered detection system, of the rotor through a lifting rope;
s500 observes whether or not 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 on 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 the alarm gives an alarm when the detection system is triggered.
In one embodiment, the first insulating layer and the second insulating layer are green sheets.
In one embodiment, the conductive layer is tinfoil.
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 lifter;
and S120, respectively lifting the two ends of the rotor through lifting ropes.
The invention also provides a generator stator fault testing method which can solve at least one technical problem.
The method for testing the stator faults of the generator comprises the step of performing insulation treatment and detection on the rotor positioned in the stator by using the method for detecting the insulation of the rotor of the generator before a stator fault test experiment is performed.
In one embodiment, S500 further comprises:
S600 judges the position of the protrusion causing the breakage by the breakage.
In one embodiment, S600 further comprises, after:
S700, polishing the protrusions;
s800, replacing the damaged first insulating layer or the second insulating material;
S900, detaching the lifting rope.
The beneficial effects are that:
the invention provides a method for detecting the insulation of a generator rotor, which comprises the following steps:
S100, a first insulating layer, a conductive layer and a second insulating layer are sequentially arranged between two end parts of a rotor and corresponding shaft lifters from top to bottom;
S200, arranging two detection systems corresponding to two ends of the rotor one by one, wherein in the detection system corresponding to each end, one end of the detection system is electrically connected with a corresponding conductive layer, and the corresponding wheel pair and the corresponding shaft lifter are respectively electrically connected with the other end of the detection system;
And S300, if the detection system corresponding to one end part is triggered, the end part is conducted with the corresponding conductive layer, and/or the shaft lifter corresponding to the end part is conducted with the conductive layer.
According to 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 lifter, 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 judgment can be performed according to the triggering condition of the detection system of the corresponding terminal, and if the detection system of a certain terminal is triggered, it is indicated that any one of the three conditions may occur at the terminal, that is, at least one of the first insulating layer and the second insulating layer is damaged. Wherein, the insulating layer damage is because the bottom to the wheel or lift the diapire of axle ware and have protruding the cause, because rotor weight is heavier, then once one of them insulating layer is pricked by protruding, another one insulating layer also has the risk of being pricked by protruding, then as long as one of them takes place, the corresponding end of rotor all has the risk of switching on with ground. Therefore, the fault point can be determined quickly according to the state of the detection system, which end of the rotor has the fault, the fault detection time is saved, the time and the labor for lifting the two ends of the rotor are saved, and the risk of conducting the rotor with the ground in the later period is reduced.
The embodiment of the invention also provides a method for testing the stator faults of the generator, which is used for carrying out insulation detection on the rotor positioned in the stator before the stator faults are tested. The method can solve at least one technical problem.
Drawings
FIG. 1 is a flow chart of a method for detecting insulation of a generator rotor;
FIG. 2 is a schematic diagram 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 at A in FIG. 2;
fig. 4 is a schematic diagram of an electrical connection between a detection system and a corresponding end of a rotor in the method for detecting insulation of a generator rotor according to the present invention.
Reference numerals: 100-rotor; 110-wheel pairs; 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-magnetic tip; 320-horn; 330-indicator light; 400-stator.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that when an element is referred to as being "fixed" 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 are used herein for illustrative purposes only and are not meant to be the only embodiment.
Referring to fig. 1 to 4, fig. 1 is a flowchart of a method for detecting insulation of a generator rotor according to the present invention;
FIG. 2 is a schematic diagram 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 at A in FIG. 2; fig. 4 is a schematic diagram of an electrical connection between a detection system and a corresponding end of a rotor in the method for detecting insulation of a generator rotor according to the present invention. In the conventional method for detecting insulation between the rotor 100 and the ground, since only one insulating layer is provided between the counter wheel 110 and the corresponding shaft lifter 120, when the rotor 100 is conducted to the ground, it is impossible to determine which insulating layer is broken, and it is necessary to sequentially lift the two ends of the rotor 100, detect, and replace the insulating layer. Because the rotor 100 is heavy, the risk is high and the time consumption is long in the process of lifting the two ends of the rotor 100 in turn. Therefore, the insulation detection method of the generator rotor 100 provided by the invention can quickly determine the fault point.
The insulation detection method for the generator rotor 100 provided by the embodiment of the invention comprises the following steps:
s100, a first insulating layer 210, a conductive layer 230, and a second insulating layer 220 are sequentially disposed between both ends of the rotor 100 and the corresponding shaft lifter 120 from top to bottom.
Specifically, the two ends of the rotor 100 are respectively provided with a pair of wheels 110, the shaft lifter 120 is provided with a groove 121 corresponding to the pair of wheels 110, and the bottom end of the pair of wheels 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 to collide with the stator 400. The first insulating layer 210, the conductive layer 230 and the second insulating layer 220 are sequentially placed in the counter 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 first insulating layer 210 and the second insulating layer 220 can isolate the counter wheel 110 from the corresponding conductive layer 230, and the shaft lifter 120 from the corresponding conductive layer 230, so that the counter wheel 110 is insulated from the corresponding shaft lifter 120, i.e. the two ends of the rotor 100 are insulated 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 counter 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 the counter wheel 110 and the shaft lifter 120 have good insulating effect with the corresponding conductive layer 230 respectively.
The gap between the rotor 100 and the stator 400 is generally smaller, and further, the first insulating layer 210, the conductive layer 230 and the second insulating layer 220 are made of thinner 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 counter wheel 110 and the corresponding grooves 121, thereby reducing the risk of collision between the rotor 100 and the stator 400.
The S200 sets two detection systems 300 corresponding to two ends of the rotor 100 one by one, in the detection system 300 corresponding to each end, one end of the detection system 300 is electrically connected to the corresponding conductive layer 230, and one end of the corresponding rotor 100 and the shaft lifter 120 are respectively electrically connected to the other end of the detection system 300.
Specifically, one end of the detection system 300 is connected to the corresponding conductive layer 230, and the corresponding wheel 110 and the shaft lifter 120 are respectively electrically connected to the other end of the detection system 300. Since the wheel 110 and the shaft 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 damaged, the wheel 110 and the shaft lifter 120 are not conducted with the corresponding conductive layer 230, and the detection system 300 cannot form a closed loop, and at this time, the detection system 300 does not respond.
If the detection system 300 corresponding to one of the end portions is triggered, the end portion is conducted with the corresponding conductive layer 230, and/or the shaft lifter 120 corresponding to the end portion is conducted with the conductive layer 230.
Specifically, if the first insulating layer 210 is broken, the paired wheel 110 corresponding to the end portion is conducted with the conductive layer 230, and the detection system 300 at the end forms a closed loop and is triggered; if the second insulating layer 220 is damaged, the shaft lifter 120 corresponding to 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 both the first insulating layer 210 and the second insulating layer 220 are broken, the conductive layer 230 at the end is conducted with the corresponding counter wheel 110 and the shaft lifter 120, and the detection system 300 at the end forms a closed loop and is triggered. Therefore, it may be determined according to the triggering condition of the detection system 300 of the corresponding terminal, and if the detection system 300 of a certain terminal is triggered, it is indicated that any one of the above three conditions may occur at the terminal, that is, at least one of the first insulating layer 210 and the second insulating layer 220 may be damaged.
The first insulating layer 210 or the second insulating layer 220 is damaged because the bottom end of the wheel 110 or the bottom wall of the groove 121 of the shaft lifter 120 is provided with a protrusion, and when one side provided with the protrusion is attached to the first insulating layer 210 or the second insulating layer 220, the first insulating layer 210 or the second insulating layer 220 is made of thinner materials, and the weight of the rotor 100 is heavier, the insulating layer attached to the protrusion is pierced by the vertical horse, and the other insulating layer is also pierced.
If the protrusion is large, the first insulating layer 210, the second insulating layer 220 and the conductive layer 230 are pierced at the same time, and the pair wheel 110 and the shaft lifter 120 at the corresponding ends are conducted; if the protrusion is moderate, the insulating layer attached to the protrusion is pierced first, then the conductive layer 230 and the other insulating layer are pierced later, and the counter wheel 110 at the corresponding end is also conducted with the corresponding shaft lifter 120; if the protrusion is smaller, the insulating layer attached to the protrusion is pierced first, and the conductive layer 230 and the other insulating layer have a risk of being pierced, and as time goes by, the conductive layer 230 and the other insulating layer at the corresponding end are pierced, that is, the corresponding pair of wheels 110 is conducted with the corresponding shaft lifter 120. Therefore, as long as one of the above three situations occurs, the corresponding end of the rotor 100 may be connected to the shaft lifter 120, and the corresponding end of the rotor 100 may be connected to ground when the shaft lifter 120 is placed on the ground, so that it can be timely determined which end of the rotor 100 has a fault according to the state of the detection system 300, thereby quickly determining the fault point, saving the fault detection time, saving the time and labor for lifting both ends of the rotor 100, and reducing the risk of connecting the rotor 100 to ground in the later stage.
Referring to fig. 1 and 4, in one embodiment, S300 further includes:
s400 lifts the end of the rotor 100 corresponding to the triggered detection system 300 by a lifting rope.
Specifically, when the detection system 300 is triggered, it is quickly determined which end of the rotor 100 is faulty. Since both ends of the rotor 100 are respectively protruded outside the stator 400, the end portion of the rotor 100 where the fault exists is lifted up by the lifting rope, and then the first insulating layer 210, the conductive layer 230, and the second insulating layer 220 are sequentially removed. It should be noted that, because the clearance between the rotor 100 and the inner cavity of the stator 400 is smaller, the lifting height of the rotor 100 lifted by the lifting rope is smaller, and the rotor 100 does not collide with the stator 400.
S500 observes whether or not the first insulating layer 210 and the second insulating layer 220 are damaged.
Specifically, by sequentially observing whether the first insulating layer 210 and the second insulating layer 220 are damaged, the reason for triggering the corresponding end detection system 300 is determined, so that the damaged insulating layers can be replaced in time, and insulation between the two ends of the rotor 100 and the ground is ensured.
With continued reference to fig. 1 and 4, in one embodiment, in S200, magnetic tips 310 are respectively disposed on 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 tips 310.
Specifically, the magnetic suction heads 310 are respectively disposed on the upper end of the counter wheel 110 and the shaft lifter 120, and the magnetic suction heads 310 are magnetic and can be electrically conductive, so that the magnetic suction heads can be stably attached to the counter wheel 110 and the shaft lifter 120, and are electrically connected with the other end of the detection system 300, so that the corresponding counter wheel 110 and the shaft lifter 120 are respectively and stably electrically connected with the other end of the detection system 300 through the corresponding magnetic suction 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 notified in time, so that the operator can process 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 an operator can be reminded in time, so that the operator can process in time.
In one embodiment, the alarm includes a horn 320 and an indicator light 330, wherein the horn 320 is connected in parallel with the indicator light 330, when the detection system 300 is triggered, the indicator light 330 lights up, and the horn 320 sounds a whistle, so that an operator can be notified and reminded in time, so that the operator can handle in time.
Referring to fig. 1,2 and 3, in one embodiment, the first insulating layer 210 and the second insulating layer 220 are green sheets.
Specifically, the thickness of the green sheet is 0.1 to 0.3 mm, so that the collision of the rotor 100 with the stator 400 due to the lifting can be reduced, and at the same time, the green sheet is a sheet for an insulating material having high mechanical strength, so that the insulation effect can be stably performed.
With continued reference to fig. 1, 2 and 3, in one embodiment, the conductive layer 230 is tinfoil.
Specifically, the tinfoil has a thickness of 0.2 mm or less and is a conductor, so that the collision of the rotor 100 with the stator 400 due to the lifting can be reduced.
Referring to fig. 1 and 2, in one 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 upper tiles on the two sides of the generator are removed, and the lower end covers and lower tiles are replaced by the shaft lifter 120, so that the counter wheels 110 on the two ends of the rotor 100 are stably supported by the shaft lifter 120.
S120 lifts both ends of the rotor 100 by the hoist ropes, respectively.
Specifically, the lifting rope is sleeved at the journal at 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 placed in the groove 121 on the shaft lifter 120 at the corresponding end from top to bottom in sequence, and then the lifting rope at the end of the rotor 100 is removed, so that the counter wheel 110 can be abutted against the first insulating layer 210 in the groove 121. Then, the lifting rope is sleeved at the shaft neck at the other end of the rotor 100, and the setting process is the same as that of one end of the rotor 100, so that the description is omitted.
Referring to fig. 1-4, in one embodiment, prior to testing the stator 400 for faults, the insulation of the rotor 100 located within the stator 400 is processed and tested using the method for testing insulation of the rotor 100 of the generator 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 rule, when two adjacent teeth in the stator 400 move through CHATTOCK magnometers, the magnetic potential difference between the two teeth is measured, when an insulation defect exists in an annular lamination, fault current is generated between the annular lamination, the ELCID test can determine whether a short circuit exists between the stator 400 core plates according to the magnitude of the fault current component by extracting a fault current component which is intersected with exciting magnetic flux. When the rotor 100 is conducted to the ground to form an induced current, the induced magnetic field formed by the induced current affects the probe of ELICD test, so that the shaft of the generator rotor 100 needs to be insulated.
According to the insulation detection method for the generator rotor 100, the rotor 100 positioned in the stator 400 is subjected to insulation treatment and detection, and the condition of the detection system 300 can be timely judged as to which end of the rotor 100 has a fault, so that the fault point can be rapidly 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 laminations is accurately obtained, and whether the short circuit exists between iron chips of the stator 400 is judged.
Referring to fig. 1,2 and 4, in one embodiment, S500 further includes:
s600 judges the position of the protrusion causing the breakage by the breakage.
Specifically, since the rotor 100 is heavy, once the bottom side of the wheel 110 or the bottom wall of the groove 121 is provided with protrusions, the first and second insulation layers 210 and 220 are finally pierced, causing damage. Therefore, at the failure end of the rotor 100, if the first insulating layer 210 is broken, it is explained that the bottom side of the corresponding counter wheel 110 may have a protrusion; if the second insulating layer 220 is broken, it is indicated that the bottom wall of the corresponding recess 121 may have a protrusion; if both the first and second insulating layers 210, 220 are broken, there may be protrusions on both the bottom side of the wheel 110 and the bottom wall of the recess 121.
Referring to fig. 1 and 2, in one embodiment, S600 further includes:
S700, polishing the protrusions.
Specifically, after the positions of the protrusions are judged by the breakage of the first and second insulating layers 210 and 220, the protrusions are sanded by sandpaper or the like, thereby preventing the protrusions from piercing the first or second insulating layers 210 or 220 again.
S800 replaces the broken 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 materials are 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 above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. The method for detecting the insulation of the generator rotor is characterized by comprising the following steps of:
S100, a first insulating layer, a conductive layer and a second insulating layer are sequentially arranged between two end parts of a rotor and corresponding shaft lifters from top to bottom;
S200, arranging two detection systems corresponding to two ends of the rotor one by one, wherein in the detection system corresponding to each end, one end of the detection system is electrically connected with the corresponding conductive layer, and one end of the corresponding rotor and the shaft lifter 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 conductive layer, and/or the shaft lifter corresponding to the end part is conducted with the conductive layer;
s400, hoisting the end part, corresponding to the triggered detection system, of the rotor through a lifting rope;
s500 observes whether or not the first insulating layer and the second insulating layer are broken.
2. The method according to claim 1, wherein in S200, magnetic suction heads are respectively disposed at both ends of the rotor and on the shaft lifter, and the other end of the detection system is electrically connected to the magnetic suction heads.
3. The method for detecting the insulation of the rotor of the generator according to claim 1, wherein an alarm is arranged on the detection system, and the alarm gives an alarm when the detection system is triggered.
4. A method of detecting insulation of a generator rotor according to claim 3, wherein the alarm is a horn.
5. The method of claim 1, wherein the first insulating layer and the second insulating layer are green sheets.
6. The method for detecting insulation of a generator rotor according to claim 1, wherein the conductive layer is a tinfoil.
7. The method for detecting insulation of a generator rotor according to claim 1, further comprising, prior to S100:
S110, removing a connecting structure between the rotor and the stator, and supporting two ends of the rotor through the shaft lifter;
and S120, respectively lifting the two ends of the rotor through lifting ropes.
8. A method for testing a stator failure of a generator, characterized in that the insulation treatment and detection of the rotor located in the stator are performed using the method for detecting insulation of a rotor of a generator according to any one of claims 1 to 7, before a test for testing a stator failure is performed.
9. The method of claim 8, further comprising, after S500:
S600 judges the position of the protrusion causing the breakage by the breakage.
10. The method of claim 9, further comprising, after S600:
S700, polishing the protrusions;
S800, replacing the damaged first insulating layer or the damaged second insulating layer;
S900, detaching the lifting rope.
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