A generator single-pole inter-turn short circuit fault detection device

Abstract

The utility model relates to a kind of generator monomer magnetic pole interturn short circuit fault testing device, including including standard magnetic pole, repetitive pulse generator and processor, the first end of the standard magnetic pole is electrically connected with the CH1 channel of the repetitive pulse generator, the tail end of the standard magnetic pole is electrically connected with the shield wire of the repetitive pulse generator, the repetitive pulse generator and processor are connected together using communication cable, the CH2 channel of the repetitive pulse generator is electrically connected between the shield wire of the repetitive pulse generator for the magnetic pole to be measured.Using the technical scheme provided by the utility model, by constructing the symmetry test model of standard magnetic pole and measured magnetic pole, combined with pulse signal superposition analysis, the precise determination of the insulation state of single magnetic pole turn is realized, and the standard magnetic pole can be calibrated, avoiding misjudgment, ensuring the accuracy and reliability of the determination result.

Description

Technical Field

[0001] This utility model belongs to the field of generator magnetic pole short circuit fault detection device, and particularly relates to a generator single magnetic pole inter-turn short circuit fault detection device. Background Technology

[0002] Conventional diagnostic methods for inter-turn short circuit faults generally include the DC resistance method, AC impedance method, detection coil method, RSO repetitive pulse method, two-pole voltage method, or voltage sharing method. However, these methods either rely solely on experience and cannot accurately determine the location of the inter-turn short circuit fault, or require the removal of the magnetic poles for fault detection. The magnetic poles of existing generators often weigh thousands of tons, and disassembly and reassembly require significant manpower, resources, and time.

[0003] In the prior art, patent document with publication number "CN117741501A" discloses a method for detecting inter-turn short-circuit faults in generator rotors using an auxiliary detection tool. The auxiliary detection tool is used to assist in detecting inter-turn short-circuit faults in generator rotors. The rotor includes a salient-pole iron core with coils wound around it, a slotted wedge connected to the iron core for fixing the coils along the iron core's axial direction, and a retaining ring connected to the end of the iron core for fixing the coils. Ventilation holes are formed on the slotted wedges along the iron core's axial direction. A gap exists between the retaining ring and the iron core. The detection tool includes: a probe for touching the coils through the ventilation holes or gaps; a lead wire for connecting the probe to other equipment; and another probe. Using this patented technology, a qualitative judgment can be made regarding the presence of inter-turn short-circuit faults in the magnetic poles, but it still cannot accurately locate the inter-turn short-circuit fault. However, this detection process is relatively complex. If the auxiliary detection tool itself has a short-circuit fault, the operator may misinterpret the RSO characteristic waveform, affecting the accuracy and reliability of the judgment results. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this utility model provides a generator single-pole inter-turn short circuit fault detection device.

[0005] This utility model provides a generator single-pole inter-turn short circuit fault detection device, including a standard magnetic pole, a repetitive pulse generator and a processor. The first end of the standard magnetic pole is electrically connected to the CH1 channel of the repetitive pulse generator, and the tail end of the standard magnetic pole is electrically connected to the shielding wire of the repetitive pulse generator. The repetitive pulse generator and the processor are connected together by a communication cable. The CH2 channel of the repetitive pulse generator and the shielding wire of the repetitive pulse generator are used to electrically connect the magnetic pole to be tested. A repetitive pulse generator, which is used to simultaneously send a characteristic pulse sequence to a standard magnetic pole and a magnetic pole to be tested; Processor: The processor is used to receive a first response signal from the standard magnetic pole and a second response signal from the magnetic pole to be tested, and to superimpose the first response signal and the second response signal to obtain a differential response signal. The processor then displays the differential response signal to the operator. The processor is also used to display the first response signal and the second response signal to the operator.

[0006] The processor can be replaced by a computer.

[0007] The standard magnetic pole and the magnetic pole to be tested are identical in shape, size, specifications, and total number of coil turns.

[0008] The standard magnetic pole is determined by using a repetitive pulse calibration device to verify that the magnetic pole to be determined does not have an inter-turn short circuit.

[0009] The repetitive pulse testing device includes a repetitive pulse generator and an oscilloscope. The inner and outer slip rings of the magnetic pole to be determined are electrically connected to the repetitive pulse generator. The shielding wire of the repetitive pulse generator is connected in parallel with the rotor shaft of the magnetic pole to be determined and then grounded. The oscilloscope is electrically connected to the CH1 and CH2 channels of the repetitive pulse generator, respectively. Repetitive pulse generator: The repetitive pulse generator is used to simultaneously send a characteristic pulse sequence to the inner slip ring and the outer slip ring; Oscilloscope: The oscilloscope is used to receive the positive and negative response signals from the undetermined magnetic pole, and to subtract the same characteristic parameters of the positive and negative response signals to obtain the characteristic parameter difference. The oscilloscope also stores the corresponding characteristic parameter difference threshold. The oscilloscope is also used to compare the characteristic parameter difference with the characteristic parameter difference threshold. If the characteristic parameter difference is less than the characteristic parameter difference threshold, the undetermined magnetic pole is taken as the standard magnetic pole.

[0010] The characteristic parameters include area, corona discharge, and phase.

[0011] The beneficial effects of this utility model are as follows: By constructing a symmetrical test model of a standard magnetic pole and the magnetic pole under test, and combining pulse signal superposition analysis, the precise determination of the inter-turn insulation state of a single magnetic pole is achieved. It can not only make a qualitative judgment on whether there is an inter-turn short circuit fault in the magnetic pole, but also find the corresponding short circuit fault location on the magnetic pole based on the position of the peak in the response signal. The detection process is relatively simple, and the presence or determination of an inter-turn short circuit fault in the magnetic pole can be performed without disassembling the magnetic pole. Even if there is an inter-turn short circuit fault in the standard magnetic pole, the operator can make a correct judgment based on the direction of the peak in the response signal, reducing misjudgments and ensuring the accuracy and reliability of the determination results. Attached Figure Description

[0012] Figure 1 This is a schematic diagram showing the connection of the standard magnetic pole, the magnetic pole under test, the repetitive pulse generator, and the processor of this utility model. Figure 2 This is a schematic diagram showing the connection of the repetitive pulse generator, the undetermined magnetic pole, the oscilloscope, the inner slip ring, and the outer slip ring of this utility model; Figure 3 The present invention uses the technical solution of this utility model to detect a standard magnetic pole and a magnetic pole under test. When neither the standard magnetic pole nor the magnetic pole under test has an inter-turn short circuit, the differential response signal spectrum is obtained. Figure 4 The present invention uses the technical solution to detect a standard magnetic pole and a magnetic pole to be tested. When there is an inter-turn short circuit in the magnetic pole to be tested, the differential response signal spectrum is obtained. Figure 5 The present invention uses the technical solution to detect a standard magnetic pole and a magnetic pole to be tested. When the standard magnetic pole has an inter-turn short circuit, the differential response signal spectrum is obtained.

[0013] In the diagram: 1-Standard magnetic pole, 2-Magnetic pole to be tested, 3-Repetitive pulse generator, 4-Processor, 5-Magnetic pole to be determined, 6-Oscilloscope, 7-Inner slip ring, 8-Outer slip ring. Detailed Implementation

[0014] The technical solution of this utility model will be further described below with reference to the accompanying drawings, but the scope of protection claimed is not limited to the description. This utility model provides a device for detecting short-circuit faults between magnetic pole turns of a generator, such as... Figures 1 to 5 As shown, it includes a standard magnetic pole 1, a repetitive pulse generator 3, and a processor 4. The first end of the standard magnetic pole 1 is electrically connected to the CH1 channel of the repetitive pulse generator 3, and the last end of the standard magnetic pole 1 is electrically connected to the shielding wire of the repetitive pulse generator 3. The repetitive pulse generator 3 and the processor 4 are connected together using a communication cable. The CH2 channel of the repetitive pulse generator 3 and the shielding wire of the repetitive pulse generator 3 are used to electrically connect the magnetic pole 2 to be tested. The repetitive pulse generator 3 is used to simultaneously send a characteristic pulse sequence to the standard magnetic pole 1 and the magnetic pole to be tested 2. Processor 4: Processor 4 is used to receive the first response signal from the standard magnetic pole 1 and the second response signal from the magnetic pole to be tested 2, and then superimpose the first response signal and the second response signal to obtain the differential response signal. Processor 4 then displays the differential response signal to the operator.

[0015] By employing the technical solution provided by this utility model, a symmetrical test model of a standard magnetic pole and the magnetic pole under test is constructed. Combined with pulse signal superposition analysis, the accurate determination of the inter-turn insulation state of a single magnetic pole is achieved. This not only enables a qualitative judgment on whether there is an inter-turn short circuit fault in the magnetic pole, but also allows the location of the corresponding short circuit fault on the magnetic pole to be found based on the position of the peak in the response signal. The detection process is relatively simple, and the presence or determination of an inter-turn short circuit fault in the magnetic pole can be performed without disassembling the magnetic pole. Furthermore, even if the standard magnetic pole also has an inter-turn short circuit fault, the operator can make a correct judgment based on the direction of the peak in the response signal, reducing misjudgments and ensuring the accuracy and reliability of the determination results.

[0016] Specifically, processor 4 is also used to display the first response signal and the second response signal to the operator. Processor 4 can be replaced by a computer. The standard magnetic pole 1 and the magnetic pole under test 2 are identical in shape, size, specifications, and total number of coil turns.

[0017] In addition, the standard magnetic pole 1 is verified by a repetitive pulse verification device to ensure that the magnetic pole to be determined 5 is free from inter-turn short circuits. The repetitive pulse verification device includes a repetitive pulse generator 3 and an oscilloscope 6. The inner slip ring 7 and outer slip ring 8 of the magnetic pole to be determined 5 are electrically connected to the repetitive pulse generator 3. The shielding wire of the repetitive pulse generator 3 is connected in parallel with the rotor shaft of the magnetic pole to be determined 5 and then grounded. The oscilloscope 6 is electrically connected to the CH1 channel and CH2 channel of the repetitive pulse generator 3, respectively. Repetitive pulse generator 3: The repetitive pulse generator 3 is used to simultaneously send a characteristic pulse sequence to the inner slip ring 7 and the outer slip ring 8; Oscilloscope 6: Oscilloscope 6 receives the positive and negative response signals from the undetermined magnetic pole 5, and subtracts the corresponding characteristic parameters from the positive and negative response signals to obtain the characteristic parameter difference. Oscilloscope 6 also stores the corresponding characteristic parameter difference threshold. Oscilloscope 6 further compares the characteristic parameter difference with the characteristic parameter difference threshold. If the characteristic parameter difference is less than the threshold, the undetermined magnetic pole 5 is used as the standard magnetic pole 1. Characteristic parameters include area, corona discharge, and phase.

[0018] In addition, this utility model also provides a method for detecting inter-turn short-circuit faults in a single generator pole, comprising the following steps: Step 1: Provide a standard magnetic pole 1, a magnetic pole to be tested 2, a repetitive pulse generator 3, and a processor 4. First, electrically connect the first end of the standard magnetic pole 1 to the CH1 channel of the repetitive pulse generator 3, and electrically connect the first end of the magnetic pole to be tested 2 to the CH2 channel of the repetitive pulse generator 3. Then, connect the tail ends of the standard magnetic pole 1 and the tail ends of the magnetic pole to be tested 2 in parallel with the shielding wire of the repetitive pulse generator 3. Finally, connect the repetitive pulse generator 3 and the processor 4 together using a communication cable. Step 2: Using the repetitive pulse generator 3, a characteristic pulse sequence is simultaneously sent to the standard magnetic pole 1 and the magnetic pole under test 2. The processor 4 receives the first response signal from the standard magnetic pole 1 and the second response signal from the magnetic pole under test 2, respectively. After superimposing the first response signal and the second response signal, a differential response signal is obtained. The processor 4 then displays the differential response signal to the operator. Step 3: If the differential response signal has a downward-concave trough, then the tested magnetic pole 2 has an inter-turn short circuit; if the differential response signal has an upward-convex peak, then the standard magnetic pole 1 has an inter-turn short circuit.

[0019] By employing the technical solution provided by this utility model, a symmetrical test model of the standard magnetic pole 1 and the magnetic pole under test is constructed. Combined with pulse signal superposition analysis, the accurate determination of the inter-turn insulation state of a single magnetic pole is achieved. This not only enables a qualitative judgment on whether there is an inter-turn short circuit fault in the magnetic pole, but also allows the location of the corresponding short circuit fault on the magnetic pole to be found based on the position of the peak in the response signal. The detection process is relatively simple, and the presence or determination of an inter-turn short circuit fault in the magnetic pole can be performed without disassembling the magnetic pole. Furthermore, even if the standard magnetic pole 1 also has an inter-turn short circuit fault, the operator can make a correct judgment based on the direction of the peak in the response signal, reducing misjudgments and ensuring the accuracy and reliability of the determination results.

[0020] Specifically, the generator single-pole inter-turn short-circuit fault detection device also includes the following steps: according to the relative position between the concave valley and the initial end of the differential response signal, the corresponding number of turns on the magnetic pole to be tested 2 is marked as the short-circuit fault point; and according to the relative position between the convex peak and the initial end of the differential response signal, the corresponding number of turns on the standard magnetic pole 1 is marked as the short-circuit fault point.

[0021] In addition, processor 4 is also used to display the first response signal and the second response signal to the operator. Processor 4 can be replaced by a computer. The standard magnetic pole 1 and the magnetic pole under test 2 are identical in shape, size, specifications, and total number of coil turns.

[0022] In addition, the generator single-pole inter-turn short circuit fault detection device also includes the following steps: providing a magnetic pole to be determined 5, and using the detection coil waveform method, rotor AC impedance and power loss test method, repetitive pulse method, pole voltage method and coil voltage method or inter-turn voltage distribution method to detect the magnetic pole to be determined 5. If there is no inter-turn short circuit in the magnetic pole to be determined 5, then the magnetic pole to be determined 5 is used as the standard magnetic pole 1, and then step one is performed.

[0023] Specifically, the repetitive pulse method for detecting the selected magnetic pole 5 includes the following steps: Step 1: Provide a repetitive pulse generator 3 and an oscilloscope 6. First, electrically connect the inner slip ring 7 and the outer slip ring 8 of the magnetic pole to be determined 5 to the repetitive pulse generator 3. Then, connect the shield wire of the repetitive pulse generator 3 in parallel with the rotor shaft of the magnetic pole to be determined 5 and ground it. Then, connect the oscilloscope 6 to the CH1 and CH2 channels of the repetitive pulse generator 3. Step 2: Using the repetitive pulse generator 3, a characteristic pulse sequence is simultaneously emitted to the inner slip ring 7 and the outer slip ring 8. The oscilloscope 6 receives the positive and negative response signals from the undetermined magnetic pole 5, and subtracts the characteristic parameters of the same type from the positive and negative response signals to obtain the characteristic parameter difference. The oscilloscope 6 also stores the corresponding characteristic parameter difference threshold. The oscilloscope 6 is also used to compare the characteristic parameter difference with the characteristic parameter difference threshold. If the characteristic parameter difference is less than the characteristic parameter difference threshold, the undetermined magnetic pole 5 is taken as the standard magnetic pole 1. Preferred characteristic parameters include area, corona discharge, and phase.

[0024] like Figure 3 As shown, the technical solution of this utility model is used to detect a standard magnetic pole and a magnetic pole under test. When neither the standard magnetic pole nor the magnetic pole under test has an inter-turn short circuit, the obtained first response signal and the second response signal are superimposed to form a differential response signal. Figure 3 The yellow line at the bottom center is the differential response signal. Since there is no inter-turn short circuit between the standard magnetic pole and the magnetic pole under test, the differential response signal is a straight line.

[0025] like Figure 4 As shown, the technical solution of this utility model is used to detect a standard magnetic pole and a magnetic pole under test. When the standard magnetic pole has no inter-turn short circuit, while the magnetic pole under test has an inter-turn short circuit, the obtained first response signal and second response signal are superimposed to form a differential response signal. Figure 4 The yellow line at the bottom center represents the differential response signal. Since the standard magnetic pole has no inter-turn short circuit, while the magnetic pole under test has an inter-turn short circuit, the differential response signal has a local concave trough. The position of the concave trough relative to the initial point of the differential response signal indicates that there is an inter-turn short circuit fault in the corresponding number of turns of the magnetic pole under test.

[0026] like Figure 5 As shown, the technical solution of this utility model is used to detect a standard magnetic pole and a magnetic pole under test. When the standard magnetic pole has an inter-turn short circuit, while the magnetic pole under test does not, the obtained first response signal and second response signal are superimposed to form a differential response signal. Figure 5 The yellow line at the bottom center represents the differential response signal. Since the standard magnetic pole has an inter-turn short circuit while the magnetic pole under test does not, the differential response signal has a local convex peak. The position of the convex peak relative to the initial point of the differential response signal indicates that the corresponding number of turns of the standard magnetic pole has an inter-turn short circuit fault.

Claims

1. A generator single pole inter-turn short circuit fault detection device, characterized by: The device includes a standard magnetic pole (1), a repetitive pulse generator (3), and a processor (4). The first end of the standard magnetic pole (1) is electrically connected to the CH1 channel of the repetitive pulse generator (3), and the tail end of the standard magnetic pole (1) is electrically connected to the shielding wire of the repetitive pulse generator (3). The repetitive pulse generator (3) and the processor (4) are connected together using a communication cable. The CH2 channel of the repetitive pulse generator (3) and the shielding wire of the repetitive pulse generator (3) are used to electrically connect the magnetic pole to be tested (2). A repetitive pulse generator (3) is used to simultaneously send a characteristic pulse sequence to a standard magnetic pole (1) and a magnetic pole to be tested (2); Processor (4): The processor (4) is used to receive a first response signal from the standard magnetic pole (1) and a second response signal from the magnetic pole to be tested (2), and to obtain a differential response signal by superimposing the first response signal and the second response signal. The processor (4) then displays the differential response signal to the operator.

2. An apparatus for detecting a short circuit between turns of a single pole of a generator as defined in claim 1, wherein: The processor (4) is also used to display the first response signal and the second response signal to the operator.

3. A generator individual pole inter-turn short circuit fault detection device as claimed in claim 1 or 2, characterized in that: The processor (4) can be replaced by a computer.

4. The generator single-pole inter-turn short-circuit fault detection device as described in claim 1, characterized in that: The standard magnetic pole (1) and the magnetic pole to be tested (2) are identical in shape, size, specifications, and total number of coil turns.

5. The generator single-pole inter-turn short-circuit fault detection device as described in claim 1, characterized in that: The standard magnetic pole (1) is determined by using a repetitive pulse calibration device to verify that the magnetic pole to be determined (5) is free from inter-turn short circuits.

6. The generator single-pole inter-turn short-circuit fault detection device as described in claim 5, characterized in that: The repetitive pulse testing device includes a repetitive pulse generator (3) and an oscilloscope (6). The inner slip ring (7) and outer slip ring (8) of the magnetic pole to be determined (5) are electrically connected to the repetitive pulse generator (3). The shielding wire of the repetitive pulse generator (3) is connected in parallel with the rotor shaft of the magnetic pole to be determined (5) and then grounded. The oscilloscope (6) is electrically connected to the CH1 channel and CH2 channel of the repetitive pulse generator (3) respectively. Repetitive pulse generator (3): The repetitive pulse generator (3) is used to simultaneously send characteristic pulse sequences to the inner slip ring (7) and the outer slip ring (8); Oscilloscope (6): The oscilloscope (6) is used to receive the positive pole response signal and the negative pole response signal from the undetermined magnetic pole (5), and subtract the same characteristic parameters of the positive pole response signal and the negative pole response signal to obtain the characteristic parameter difference value. The oscilloscope (6) also stores the corresponding characteristic parameter difference threshold. The oscilloscope (6) is also used to compare the characteristic parameter difference value with the characteristic parameter difference threshold. If the characteristic parameter difference value is less than the characteristic parameter difference threshold, the undetermined magnetic pole (5) is used as the standard magnetic pole (1).

7. The generator single-pole inter-turn short-circuit fault detection device as described in claim 6, characterized in that: The characteristic parameters include area, corona discharge, and phase.

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