Stator coil potential measurement system and device

Abstract

This application relates to a stator coil potential measurement system and apparatus. The stator coil potential measurement system includes: a voltage generating device, a potential measurement module, and a data recording terminal. The voltage generating device is used to connect to the copper conductor layer of the stator coil. One end of the potential measurement module is used to connect to the measurement point of the semiconducting layer of the stator coil, and the other end of the potential measurement module is communicatively connected to the data recording terminal. This application can improve the measurement efficiency of the slot potential of the stator coil in a large generator.

Description

Technical Field

[0001] This application relates to the field of generator measurement technology, and in particular to a stator coil potential measurement system and device. Background Technology

[0002] During the operation of large steam turbine generators and hydro turbine generators, the insulation layer and anti-corona layer of the stator coil will gradually age under the action of electromagnetic force, mechanical stress and heat energy, causing the ground potential of some parts of the stator coil core slots to rise.

[0003] Excessive slot potential can cause electric spark discharge in the stator coil slots, damaging the stator coil insulation and leading to a grounding fault in the generator stator coil. Therefore, it is necessary to measure the stator coil slot potential during the manufacturing process of the generator coil and during unit maintenance.

[0004] However, traditional methods for measuring the slot potential of stator coils in large generators require at least two people to perform the measurement work inside the stator cavity. They also need to frequently move the multimeter and tidy up the measuring leads, and spend a lot of time reading and recording the measurement data. This results in very low efficiency for measuring the slot potential of stator coils in large generators. Utility Model Content

[0005] Therefore, it is necessary to provide a stator coil potential measurement system and device that can improve the measurement efficiency of the stator coil slot potential of a large generator, in order to address the above-mentioned technical problems.

[0006] In a first aspect, this application provides a stator coil potential measurement system, including: a voltage generating device, a potential measurement module, and a data recording terminal;

[0007] The voltage generating device is used to connect the copper conductor layer of the stator coil;

[0008] One end of the potential measurement module is used to connect to the measurement point of the semiconducting layer of the stator coil, and the other end of the potential measurement module is connected to the data recording terminal for communication.

[0009] In one embodiment, the voltage generating device includes: a voltage regulator, a test transformer, an overvoltage protector, an ammeter, a resistor, a compensating reactor, and an AC voltage divider;

[0010] The input side of the voltage regulator is connected to the mains power supply, and the output side of the voltage regulator is connected to the low-voltage side of the test transformer;

[0011] One end of the resistor is connected to one end of the high-voltage side of the test transformer and one end of the overvoltage protector, respectively. The other end of the resistor is connected to one end of the compensation reactor, one end of the AC voltage divider, and the copper conductor layer of the stator coil.

[0012] The other end of the high-voltage side of the test transformer, the other end of the overvoltage protector, the other end of the compensating reactor, and the other end of the AC voltage divider are all grounded through a current meter.

[0013] In one embodiment, the compensating reactor is an adjustable inductance power frequency reactor.

[0014] In one embodiment, the potential measurement module is a potential measurement probe; the potential measurement probe includes a conductive probe installed at the front end of the probe body, a digital display screen, and a first wireless communication module;

[0015] The front end of the conductive probe is a raised hemispherical contact tip; the conductive probe is used to extend into the core ventilation hole of the stator coil and contact the measurement point of the semiconductive layer of the stator coil to measure the measurement potential of the stator coil.

[0016] The first wireless communication module establishes a communication connection with the data recording terminal;

[0017] The digital display screen shows the measured potential.

[0018] In one embodiment, the potential measuring probe further includes a first indicator light and a second indicator light;

[0019] The first indicator light illuminates when the measured potential is not greater than the set threshold.

[0020] The second indicator light illuminates when the measured potential exceeds the set threshold.

[0021] In one embodiment, the potential measuring probe also includes a hand grip sleeve;

[0022] The hand grip sleeve is located at the rear end of the potential measurement probe; the hand grip sleeve is made of insulating rubber.

[0023] In one embodiment, the first wireless communication module is a WIFI communication chip and / or a mobile communication chip.

[0024] In one embodiment, the data recording terminal includes a memory, a processor, a display, a second wireless communication module, and a power module;

[0025] The processor is connected to the memory, display, second wireless communication module and power module respectively; the second wireless communication module establishes a wireless communication connection with the first wireless communication module.

[0026] In one embodiment, the second wireless communication module is a WIFI communication chip and / or a mobile communication chip.

[0027] In a second aspect, this application provides a stator coil potential measuring device, including the stator coil potential measuring system as described in any of the first aspects.

[0028] The aforementioned stator coil potential measurement system and device connects to the copper conductor layer of the stator coil via a voltage generating device to provide a test voltage to the stator coil of a large generator. One end of the potential measurement module is connected to the measurement point of the semiconducting layer of the stator coil, and the other end of the potential measurement module is communicatively connected to a data recording terminal for measuring and recording the potential data of the stator coil slots. This application effectively improves the measurement efficiency of the potential of the stator coil slots of a large generator through the above method. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a diagram illustrating the application environment of a stator coil potential measurement system in one embodiment.

[0031] Figure 2 This is a schematic diagram of the circuit structure of a voltage generating device in one embodiment;

[0032] Figure 3 This is a schematic diagram of the potential measurement probe in one embodiment;

[0033] Figure 4 This is a schematic diagram of the structure of a data recording terminal in one embodiment. Detailed Implementation

[0034] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0036] It is understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0037] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0038] It is understandable that "at least one" refers to one or more, and "multiple" refers to two or more. "At least a part of an element" refers to part or all of an element.

[0039] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0040] During operation, large steam turbine generators and large hydro turbine generators experience gradual aging of the insulation and anti-corona layers of their stator coils under the influence of electromagnetic forces, mechanical stress, and heat. This leads to an increase in the ground potential within the stator coil core slots. Furthermore, manufacturing defects in the stator coils may result in small air gaps within the core slots, causing poor contact between the coils and the slot walls, which can also lead to excessively high potential in the stator coil slots.

[0041] Excessive slot potential can cause electrical sparking in the stator coil slots, damaging the stator coil insulation and leading to a grounding fault in the generator stator coil. Therefore, it is necessary to measure the stator coil slot potential during the manufacturing process of the generator coil and during unit maintenance. Generally, when the slot potential exceeds 10V, the stator coil requires appropriate treatment.

[0042] The traditional method for measuring the slot potential of generator stator coils involves applying a test voltage to the stator coils using a large test transformer, and then measuring the slot potential using a wire probe and a multimeter. Specifically, the multimeter's voltage probes are connected to a long, insulated plastic wire, which is then connected to a bent, stiff iron wire. This connection is secured with insulating tape. The other probe of the multimeter is connected to a plastic wire to ground outside the stator slots. In practical applications, when measuring slot potential using this traditional method, one operator holds the wire probe to touch the stator slots, while another operator uses the multimeter to read and record the data.

[0043] This measurement method requires at least two people to perform the measurement work inside the stator cavity, and the measuring tools made from multimeters, stiff iron wires, plastic wires and insulating tape are too rudimentary and have poor safety performance.

[0044] The traditional measurement method described above has the following main drawbacks:

[0045] ① The test transformer is too bulky. The generator stator coil has a large capacitance, especially the stator coil of the hydro generator has many branches and the number of coils can be as high as 500 slots. The capacitance is huge, and a large-capacity test transformer is required to apply the test voltage, which makes the test transformer too bulky.

[0046] ② The experiment carries high safety risks. The homemade wire probe is too rudimentary, the insulating tape is easily damaged, and personnel are at risk of electric shock. In addition, two personnel are required to work together inside the stator cavity, further increasing the safety risks of the experiment.

[0047] ③ The measurement data has a large error. The sharp tip of the iron wire probe has a small contact area with the semiconductive layer of the stator coil, resulting in unstable contact and easy fluctuations in the measurement data, leading to a large measurement error. Moreover, the sharp tip of the iron wire may also puncture the semiconductive layer of the coil.

[0048] ④ Low measurement efficiency. There are many generator stator coils. Each slot coil needs to measure the slot potential at multiple points along the slot opening, between slots and at the bottom of the slot. There can be as many as thousands of measurement points. It is necessary to move the multimeter frequently and arrange the measuring wires, which takes a lot of time to read and record the measurement data.

[0049] In view of the shortcomings of the traditional equipment and methods for testing the slot potential of stator coils in large generators, this utility model provides a stator coil potential measurement system and device for measuring the slot potential of stator coils in large generators.

[0050] The stator coil potential measurement system provided in this application embodiment can be applied to, for example... Figure 1In the application environment shown, the stator coil 100 includes at least a copper conductor layer, an insulating layer, and a semiconductive layer. In some examples, the semiconductive layer of the stator coil 100 is generally a semiconductor pad layer or a low-resistance anti-corona layer, and the measurement points of the semiconductive layer of the stator coil 100 can be the positions corresponding to the wide surface of the semiconductor layer and the stator core ventilation holes.

[0051] In one exemplary embodiment, such as Figure 1 As shown, this application provides a stator coil potential measurement system 200, which includes: a voltage generating device 202, a potential measurement module 204, and a data recording terminal 206;

[0052] The voltage generating device 202 is used to connect the copper conductor layer of the stator coil 100;

[0053] One end of the potential measurement module 204 is used to connect to the measurement point of the semiconducting layer of the stator coil 100, and the other end of the potential measurement module 204 is communicatively connected to the data recording terminal 206.

[0054] The voltage generating device 202 can be used to provide a test voltage to the stator coil 100 of a large generator. Optionally, the test voltage can be the rated phase-to-phase voltage.

[0055] In some examples, the potential measurement module 204 can transmit the tank potential data measured by the potential measurement module 204 to the data recording terminal 206 via wireless communication.

[0056] Specifically, the stator coil 100 potential measurement system 200 can provide the rated phase-to-phase voltage to the stator coil 100 of the large generator through the voltage generating device 202, and measure the slot potential of the stator coil 100 through the potential measurement module 204. Then, the slot potential data measured by the potential measurement module 204 is transmitted to the data recording terminal 206 to instruct the data recording terminal 206 to generate a measurement report on the slot potential of the stator coil 100 according to user requirements, thereby effectively improving the measurement efficiency of the slot potential of the stator coil 100 of the large generator.

[0057] The aforementioned stator coil 100 potential measurement system 200 connects to the copper conductor layer of the stator coil 100 via a voltage generating device 202 to provide a test voltage to the stator coil 100 of the large generator. One end of the potential measurement module 204 is connected to the measurement point of the semiconducting layer of the stator coil 100, and the other end of the potential measurement module 204 is communicatively connected to a data recording terminal 206 to measure and record the slot potential data of the stator coil 100. This application effectively improves the measurement efficiency of the slot potential of the stator coil 100 of the large generator through the above method.

[0058] In one embodiment, such as Figure 2 As shown, the voltage generating device includes: a voltage regulator 210, a test transformer 220, an overvoltage protector 230, a current meter 240, a resistor 250, a compensating reactor 270, and an AC voltage divider 280.

[0059] The input side of the voltage regulator 210 is connected to the mains power supply, and the output side of the voltage regulator 210 is connected to the low-voltage side of the test transformer 220.

[0060] One end of resistor 250 is connected to one end of the high voltage side of test transformer 220 and one end of overvoltage protector 230, respectively. The other end of resistor 250 is connected to one end of compensating reactor 270, one end of AC voltage divider 280 and the copper conductor layer of stator coil, respectively.

[0061] The other end of the high-voltage side of the test transformer 220, the other end of the overvoltage protector 230, the other end of the compensating reactor 270, and the other end of the AC voltage divider 280 are all grounded through the current meter 240.

[0062] The current meter 240 can be used to measure the current of the stator coil.

[0063] In some examples, the input side of the voltage regulator 210 (also called a voltage regulator operator) is connected to a 380V AC mains power supply.

[0064] It is understood that the first end of the high-voltage side of the test transformer 220 is connected to the copper conductor layer at the output end of the generator stator coil via the current-limiting resistor 250, and outputs test voltage to the stator coil; the current-limiting resistor 250 is connected between the first end of the high-voltage side of the test transformer 220 and the stator coil, which can limit the discharge current during a fault; the first end of the high-voltage side of the test transformer 220 is also connected to an overvoltage protector 230 to limit the overvoltage during a fault, thereby protecting the safety of the voltage generating equipment.

[0065] Furthermore, the first end of the compensating reactor 270 is connected to the copper conductor layer of the stator coil to compensate for the capacitive current of the stator coil. The AC voltage divider 280 is connected to the copper conductor layer of the stator coil to monitor the magnitude of the output voltage value of the test transformer 220.

[0066] In some possible implementations, the capacity of the test transformer 220 in this embodiment can be set to 20kVA, its rated output voltage on the high-voltage side can be set to 20kV, and its weight can be set to 120kg. Optionally, the capacity of the compensating reactor 270 can be set to 120kVA, its rated output current can be set to 6A, and its weight can be set to 400kg. It is understood that the voltage generating device constructed based on the circuit configuration described above in this embodiment reduces the component size compared to traditional devices used for measuring the stator coils of large generators, making it easier to transport and use on-site.

[0067] In one embodiment, the compensating reactor 270 is an inductance-adjustable power frequency reactor.

[0068] Among them, the adjustable inductance power frequency reactor can cause the system's voltage circuit to resonate by increasing or decreasing the reactor's inductance, and use the inductance current output from the reactor's first end to compensate for the stator coil's capacitive current, thereby reducing the output current of the test transformer 220.

[0069] The embodiments of this application, through the above-described method, enable the application of corresponding test voltages to the stator coils of large power generation equipment using only a small-capacity, lightweight test transformer 220.

[0070] In one embodiment, such as Figure 3 As shown, the potential measurement module is a potential measurement probe; the potential measurement probe includes a conductive probe 310 installed at the front end of the probe body 320, a digital display screen 330, and a first wireless communication module 370.

[0071] The front end of the conductive contact pin 310 is a raised hemispherical contact end; the conductive contact pin 310 is used to extend into the core ventilation hole of the stator coil and contact the measurement point of the semiconductive layer of the stator coil to measure the measurement potential of the stator coil.

[0072] The first wireless communication module 370 establishes a communication connection with the data recording terminal; the digital display screen 330 displays the measured potential.

[0073] The conductive probe 310 of the potential measuring probe can extend into the core ventilation hole corresponding to the stator coil and contact the measurement point on the semiconductive layer of the stator coil surface to conduct the slot potential of the stator coil to the internal measurement circuit of the potential measuring probe for potential measurement. The first wireless communication module 370 can be used to communicate with the wireless communication module of the data recording terminal, thereby sending the collected potential data to the data recording terminal. Optionally, the first wireless communication module 370 may include a WIFI communication chip and / or a mobile communication chip, etc., and the first wireless communication module 370 can be installed in the internal circuit of the measuring probe.

[0074] Furthermore, the conductive contact 310 is mounted at the front end of the pen body 320, and its overall shape can be designed to be slender to facilitate insertion into the core ventilation hole. It can be understood that by designing the front end of the conductive contact 310 as a convex hemispherical contact tip, the contact area during contact can be increased, thereby making the obtained potential measurement data more stable and accurate, without damaging the semiconductive layer of the stator coil.

[0075] In some examples, the potential measuring probe also includes a measuring switch 360, which can be used to control the power-on and power-off of the potential measuring probe. The potential measuring probe also includes a grounding jack 380 for connecting a grounding wire 3110 to ground the potential reference terminal of the potential measuring circuit inside the probe. Optionally, the grounding wire 3110 is a copper core flexible cable, with one end being a lantern plug for reliable connection to the grounding jack, and the other end designed as a pointed alligator clip for clamping connection to the grounding terminal.

[0076] In one embodiment, the potential measuring probe further includes a first indicator light 340 and a second indicator light 350;

[0077] The first indicator light 340 illuminates when the measured potential is not greater than the set threshold.

[0078] The second indicator light 350 illuminates when the measured potential exceeds a set threshold.

[0079] Optionally, the first indicator light 340 can be set to a green indicator light, and the second indicator light 350 can be set to a red indicator light.

[0080] For example, taking a green indicator light 340 and a red indicator light 350 as an example, when the measured potential of the stator coil is not greater than the set threshold, the green indicator light illuminates to simply and intuitively inform the operator that the current measured potential data of the stator coil is qualified. The operator does not need to carefully check the data on the digital display screen 330, thereby improving the measurement efficiency of the stator coil. When the measured potential is greater than the set threshold, the red indicator light illuminates to simply and intuitively inform the operator that the measured potential data is unqualified. At this time, the operator can view the magnitude of the potential value on the digital display screen 330 for further analysis and judgment.

[0081] In some examples, the potential measurement probe also includes a power battery 3100 mounted at the rear end of the potential measurement probe. The power battery 3100 can be used to provide power to the digital display screen, the first indicator light 340, the second indicator light 350, and the first wireless communication module 370, etc. Optionally, the power battery 3100 is a lithium battery.

[0082] In one embodiment, the potential measuring probe also includes a hand-held sleeve 390;

[0083] The hand grip sleeve 390 is located at the rear end of the body 320 of the potential measuring probe; the hand grip sleeve 390 is made of insulating rubber.

[0084] Specifically, the hand grip sleeve 390 located at the rear end of the pen body 320 is the part where the measuring personnel hold the potential measuring probe. It is understood that the hand grip sleeve, made of insulating rubber, has high insulation strength, thus preventing electric shock to the measuring personnel.

[0085] Optionally, the surface of the hand grip sleeve 390 can be provided with anti-slip stripes to help the measuring personnel grip the potential measuring probe.

[0086] In one embodiment, the first wireless communication module 370 is a WIFI communication chip and / or a mobile communication chip.

[0087] In one embodiment, such as Figure 4 As shown, the data recording terminal 206 includes a memory 410, a processor 420, a display 430, a second wireless communication module 440, and a power module 450.

[0088] The processor 420 is connected to the memory 410, the display 430, the second wireless communication module 440 and the power module 450 respectively; the second wireless communication module 440 establishes a wireless communication connection with the first wireless communication module.

[0089] The power module 450 of the data recording terminal 206 provides power to all parts of the data recording terminal 206.

[0090] For example, the memory 410 of the data recording terminal 206 includes random access memory 410 and read-only memory 410, which can be used to store data analysis programs and potential measurement data. In some examples, the analysis program can automatically determine whether the potential measurement data meets the requirements and automatically fill the potential measurement values ​​into a test table.

[0091] In some examples, the processor 420 of the data recording terminal 206 serves as the control center of the data recording terminal 206, connecting various parts of the terminal through various interfaces and lines. The processor 420 of the data recording terminal 206 performs data analysis and recording by running software programs stored in the memory 410.

[0092] Furthermore, the display 430 of the data logging terminal 206 can be used to display data analysis programs and potential data recording processes. In some possible implementations, the display 430 can also be used to set relevant measurement parameters of the stator coils, such as generator model, number of coil slots, and potential threshold values. In addition, the display 430 can also display various menu bars of the data terminal. Optionally, the display 430 of the data logging terminal 206 can be a screen or a touchscreen.

[0093] In one embodiment, the second wireless communication module 440 is a WIFI communication chip and / or a mobile communication chip.

[0094] In some examples, the second wireless communication module 440 can be used to communicate with the first wireless communication module 370 of the potential measuring probe, receive the measurement data from the potential measuring probe, and send relevant instructions to the measuring probe.

[0095] Those skilled in the art will understand that Figure 4 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the data recording terminal to which the present application is applied. A specific data recording terminal may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0096] In one exemplary embodiment, this application also provides a stator coil potential measuring device, including the stator coil potential measuring system as described in any of the above system embodiments.

[0097] To make the objectives, technical solutions, and advantages of this application clearer, this application provides an exemplary process for measuring the slot potential of the stator coil of a large generator using the stator coil potential measurement system described in the above embodiments, as detailed below:

[0098] First, input the number of stator coil slots and the number of measurement points per slot into the data recording terminal. The analysis program on the data recording terminal automatically generates a measurement table by numbering the input parameters in the vertical and horizontal directions.

[0099] Then, the rated phase-to-phase voltage is applied to the stator coil through the voltage generating device. At this time, the measuring personnel in the stator cavity use a potential measuring probe to touch the measuring point of the semiconductive layer of the stator coil to measure the slot potential.

[0100] When the data recording terminal receives the potential data signal sent by the measuring probe, the analysis program defaults to a 2-second data stabilization delay before taking the potential measurement value and automatically fills it into the data fill column of the measurement table.

[0101] The analysis program on the data recording terminal can determine whether the measured value meets the requirements based on a set potential threshold, which is 10V. If the measured potential value is less than the threshold, the program will display a save option; if the measured potential value is greater than the threshold, the measured data will be displayed in red, and a save option will also appear.

[0102] After the recorder outside the stator chamber clicks the save option, the program can automatically move to the next data filling column and send a signal that the data has been saved to the potential measurement probe via the wireless transmission module. After the probe receives the signal, the indicator light will flash to indicate to the measurement personnel that the relevant data has been saved, thereby instructing the measurement personnel to perform the potential measurement of the slot at the next point.

[0103] The surveyor moves the probe to the next point according to the preset measurement sequence. This process is repeated until the slot potential measurements of all coils are completed and the data is saved. Optionally, the measurement terminal can also generate a potential trend graph based on the slot potential data of each coil, facilitating the surveyor's assessment of the stator coil insulation condition.

[0104] It is understood that the stator coil potential measurement system and stator coil potential measurement device described in the above embodiments can achieve at least the following beneficial technical effects when implemented:

[0105] ① Convenient measurement: The voltage generating equipment and potential measuring probe are much smaller and lighter than traditional large test transformers and voltmeters.

[0106] ② High test safety: The insulation strength of the potential measurement probe body and the hand-held sleeve is high, effectively isolating charged bodies. Moreover, the measurement personnel can record slot potential data outside the stator cavity, ensuring high test safety.

[0107] ③ Stable and accurate measurement data: The conductive probe of the potential measurement probe has a large contact area with the stator coil semiconductor, resulting in stable contact and less fluctuation in measurement data, thus ensuring accurate measurement data.

[0108] ④ High measurement efficiency: The data recording terminal can quickly record and save potential data, greatly shortening the measurement time.

[0109] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0110] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0111] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A stator coil potential measurement system, characterized in that, include: Voltage generating equipment, potential measurement module, and data recording terminal; The voltage generating device is used to connect the copper conductor layer of the stator coil; One end of the potential measurement module is used to connect to the measurement point of the semiconducting layer of the stator coil, and the other end of the potential measurement module is communicatively connected to the data recording terminal.

2. The system according to claim 1, characterized in that, The voltage generating equipment includes: a voltage regulator, a test transformer, an overvoltage protector, an ammeter, a resistor, a compensating reactor, and an AC voltage divider; The input side of the voltage regulator is connected to the mains power supply, and the output side of the voltage regulator is connected to the low-voltage side of the test transformer; One end of the resistor is connected to one end of the high-voltage side of the test transformer and one end of the overvoltage protector, respectively. The other end of the resistor is connected to one end of the compensation reactor, one end of the AC voltage divider, and the copper conductor layer of the stator coil, respectively. The other end of the high-voltage side of the test transformer, the other end of the overvoltage protector, the other end of the compensation reactor, and the other end of the AC voltage divider are all grounded through the current measuring meter.

3. The system according to claim 2, characterized in that, The compensating reactor is an adjustable inductance power frequency reactor.

4. The system according to claim 1, characterized in that, The potential measurement module is a potential measurement probe; the potential measurement probe includes a conductive probe installed at the front end of the probe body, a digital display screen, and a first wireless communication module; The front end of the conductive probe is a raised hemispherical contact tip; the conductive probe is used to extend into the core ventilation hole of the stator coil and contact the measurement point of the semiconductive layer of the stator coil to measure the measurement potential of the stator coil. The first wireless communication module establishes a communication connection with the data recording terminal; The digital display screen shows the measured potential.

5. The system according to claim 4, characterized in that, The potential measuring probe also includes a first indicator light and a second indicator light; The first indicator light illuminates when the measured potential is not greater than a set threshold. The second indicator light illuminates when the measured potential is greater than a set threshold.

6. The system according to claim 4, characterized in that, The potential measurement probe also includes a hand-held sleeve; The grip sleeve is located at the rear end of the potential measuring probe; the grip sleeve is made of insulating rubber.

7. The system according to claim 4, characterized in that, The first wireless communication module is a WIFI communication chip and / or a mobile communication chip.

8. The system according to any one of claims 4 to 7, characterized in that, The data recording terminal includes a memory, a processor, a display, a second wireless communication module, and a power module; The processor is connected to the memory, the display, the second wireless communication module, and the power module respectively; the second wireless communication module establishes a wireless communication connection with the first wireless communication module.

9. The system according to claim 8, characterized in that, The second wireless communication module is a WIFI communication chip and / or a mobile communication chip.

10. A stator coil potential measuring device, characterized in that, Includes the stator coil potential measurement system as described in any one of claims 1 to 9.

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