Partial discharge generating apparatus

Abstract

To provide a partial discharge generator capable of easily generating partial discharge of a plurality of discharge forms.SOLUTION: The plasma processing apparatus includes a power supply generation circuit connected to a power supply to generate a high voltage, and a pair of power supply output ports connected to the power supply generation circuit, wherein the pair of power supply output ports are configured so that electrodes corresponding to a plurality of discharge forms can be attached and detached.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a partial discharge generating device. [Background technology]

[0002] Electrical equipment, such as power receiving equipment and substations, is designed to safely use high voltages using various insulating materials. However, as these insulating materials deteriorate over time or due to environmental factors, partial discharges, which are localized microdischarges such as corona discharges and creeping discharges, occur. Furthermore, continued partial discharges can ultimately lead to insulation breakdown due to the generation of chemically active substances such as ozone or nitric acid, as well as localized temperature increases. Therefore, from the perspective of preventive maintenance, technologies have been developed to detect partial discharges and prevent insulation breakdown accidents (e.g., Patent Document 1). To verify the performance of these partial discharge detectors and build noise discrimination and operational know-how, it is necessary to generate partial discharges by degrading insulating materials in the field or by applying higher-than-normal voltages using special power supplies. Some electric power companies and research institutes have taken insulating materials that have actually been used, poured salt water on them in laboratories to induce discharges, and then applied a voltage several times the operating voltage to generate partial discharges to verify the performance of the detectors. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-075482 Summary of the Invention [Problem to be solved by the invention]

[0004] Most partial discharge detection devices detect electromagnetic waves or ultrasonic waves propagating through switchboards, and it is desirable to verify their performance using actual high-voltage equipment. However, intentionally causing partial discharges by spraying salt water or applying overvoltage to high-voltage equipment in use shortens the life of the equipment and is also undesirable from a safety standpoint.

[0005] In view of the above circumstances, an object of the present disclosure is to provide a partial discharge generator that can easily generate partial discharges of multiple discharge types without the need to spray salt water on high-voltage equipment that is actually in use. [Means for solving the problem]

[0006] (1) A partial discharge generating device according to an embodiment of the present disclosure includes: a power supply generating circuit connected to the power supply to generate a high voltage; a pair of power outlets connected to the power generating circuit; and The pair of power outlets are characterized in that they are configured so that electrodes corresponding to a plurality of discharge modes can be attached and detached.

[0007] (2) A partial discharge generator according to an embodiment of the present disclosure is the partial discharge generator according to (1), the electrodes include electrodes for corona discharge; The corona discharge electrodes include a needle electrode and a flat electrode, The needle electrode and the plate electrode are configured so that the distance therebetween is adjustable.

[0008] (3) A partial discharge generator according to an embodiment of the present disclosure is the partial discharge generator according to (1), the electrodes include electrodes for void discharge, The void discharge electrodes have a first electrode, a second electrode, and a pair of insulators with holes formed therein, and are characterized in that the pair of insulators are sandwiched between the first electrode and the second electrode.

[0009] (4) A partial discharge generator according to an embodiment of the present disclosure is the partial discharge generator according to (1), the electrodes include electrodes for surface discharge, The creeping discharge electrodes are composed of an insulator and electrodes provided on both ends of the insulator.

[0010] (5) A partial discharge generator according to an embodiment of the present disclosure is the partial discharge generator according to any one of (1) to (4), the power supply generating circuit includes a microcomputer; The microcomputer controls the high voltage output from the power generation circuit in synchronization with a predetermined frequency.

[0011] (6) A partial discharge generator according to an embodiment of the present disclosure is the partial discharge generator according to (5), The predetermined frequency is 50 Hz, 60 Hz, or the cycle of the commercial voltage in the distribution board. [Effects of the Invention]

[0012] According to the partial discharge generator according to an embodiment of the present disclosure, partial discharges of a plurality of discharge types can be easily generated. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a diagram illustrating an overview of a partial discharge generating device according to an embodiment of the present disclosure. [Figure 2] FIG. 1 is a diagram illustrating a circuit configuration of a power generation circuit according to an embodiment of the present disclosure. [Figure 3] FIG. 2 is a schematic diagram showing an electrode for corona discharge attached to a partial discharge generating device according to an embodiment of the present disclosure. [Figure 4] FIG. 10 is a diagram showing the results of partial discharge generated by attaching a corona discharge electrode. [Figure 5] FIG. 2 is a schematic diagram showing an electrode for void discharge attached to a partial discharge generator according to an embodiment of the present disclosure. [Figure 6]FIG. 10 is a diagram showing the results of partial discharge generated by attaching an electrode for void discharge. [Figure 7] 1 is a schematic diagram showing an electrode for surface discharge attached to a partial discharge generating device according to an embodiment of the present disclosure. FIG. [Figure 8] FIG. 10 is a diagram showing the results of partial discharges generated by attaching electrodes for creeping discharge. [Figure 9] FIG. 1 illustrates an example of a configuration of an information processing device. [Figure 10] FIG. 10 is a diagram illustrating an example of an operation of the information processing device. [Figure 11] 1 is a schematic diagram showing a schematic configuration of a switchboard including a partial discharge generation device according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, embodiments of the present disclosure will be described.

[0015] (Outline of the embodiment) First, an outline of this embodiment will be described, and details will be provided later. The partial discharge generator 1 according to this embodiment has a power supply generating circuit 10 that is connected to a power supply and generates a high voltage, and a pair of power outlets 20 that are connected to the power supply generating circuit 10. The pair of power outlets 20 are characterized by being configured to allow detachable attachment of electrodes corresponding to a plurality of discharge forms.

[0016] As described above, according to the partial discharge generator 1 of this embodiment, the power outlet 20 is configured to allow the attachment and detachment of electrodes corresponding to a plurality of discharge forms, so that partial discharges of a plurality of discharge forms can be easily generated.

[0017] Next, each component of the partial discharge generator 1 according to this embodiment will be described in detail. In this embodiment, the multiple discharge forms are corona discharge, void discharge, and creeping discharge, but the multiple discharge forms are not limited to these. For example, the multiple discharge forms may include spark discharge.

[0018] 1 is a diagram showing an overview of a partial discharge generator 1 according to this embodiment. The partial discharge generator 1 according to this embodiment includes a power generation circuit 10, a power outlet 20, a synchronization signal input unit 30, a power button 40, a power selection button 50, and a power selection status display unit 60.

[0019] The power supply generating circuit 10 is connected to a power supply and generates a high voltage. An example of the circuit configuration of the power supply generating circuit 10 will be described later.

[0020] The pair of power outlets 20 includes a power outlet 21 and a power outlet 22. The pair of power outlets 20 are connected to a power generating circuit 10. The pair of power outlets 20 are configured to allow detachable attachment of electrodes according to a plurality of discharge forms.

[0021] The synchronization signal input unit 30 includes a connection interface, such as a coaxial cable, to which a synchronization signal can be connected. The synchronization signal input unit 30 sends the synchronization signal to the power supply generating circuit 10. The power supply generating circuit 10 controls the frequency of the voltage to be generated based on the synchronization signal.

[0022] The power button 40 is an operation button for switching ON / OFF the power supply of the partial discharge generator 1. The power supply selection button 50 is an operation button for switching the type of power supply generated by the power generation circuit 10. The type of power supply may be, for example, a 50 Hz AC power supply, a 60 Hz AC power supply, a direct current (DC) power supply, etc. The power supply selection status display unit 60 displays information about the type of power supply selected by the power supply selection button 50. The power supply selection status display unit 60 may be configured with, for example, a first LED 61 and a second LED 62. For example, the power supply selection status display unit 60 may express information about the type of power supply by turning on or off the first LED 61 and the second LED 62. Specifically, when the type of power supply is a 50 Hz AC power supply, the power supply selection status display unit 60 may display information about the type of power supply by turning off the first LED 61 and the second LED 62. Furthermore, when the type of power source is a 60 Hz AC power source, the power source selection status display unit 60 may display information about the type of power source by turning on the first LED 61 and turning off the second LED 62. Furthermore, when the type of power source is DC, the power source selection status display unit 60 may display information about the type of power source by turning on the first LED 61 and the second LED 62.

[0023] 2 is a diagram showing the circuit configuration of a power generation circuit 10 according to an embodiment of the present disclosure. The power generation circuit 10 includes a microcomputer 11, a transistor 12, a battery 13, a coil 14, a Cockcroft rectifier circuit 15, a voltage terminal 16, and an antenna 17.

[0024] The microcomputer 11 switches on and off the transistor 12 to induce a high voltage in the coil 14 connected to the battery 13. A Cockcroft rectifier circuit 15 is connected to the high-voltage side of the coil 14. With this configuration, a pulse voltage can be obtained from a voltage terminal 16 at the end of the Cockcroft rectifier circuit 15. The value of the pulse voltage obtained with this configuration is, for example, 4.5 kV. The period of the pulse voltage is synchronized by the microcomputer 11 to a predetermined frequency (50 Hz or 60 Hz). Alternatively, the microcomputer 11 may detect the induced voltage in the switchboard using an antenna 17 and synchronize with the induced voltage. Alternatively, the microcomputer 11 may be able to select either of these.

[0025] 3 is a schematic diagram showing a corona discharge electrode 100 that is detachably attached to the partial discharge generator 1 according to an embodiment of the present disclosure. The corona discharge electrode 100 has a needle electrode 101, a limiting resistor 102, and a plate electrode 103.

[0026] The needle electrode 101 is a needle-shaped electrode with a sufficiently small diameter. The diameter of the needle electrode 101 is, for example, 0.2 mm, but is not limited to this. The needle electrode 101 is made of a conductive material such as copper. The needle electrode 101 is connected to the power outlet 21 via a limiting resistor 102. The resistance value of the limiting resistor 102 is, for example, 5 kΩ, but is not limited to this.

[0027] The plate electrode 103 is a disk-shaped electrode. The diameter of the plate electrode 103 is, for example, 30 mm, but is not limited to this. The plate electrode 103 is made of a conductive material such as copper. The plate electrode 103 is connected to the power outlet 22.

[0028] The needle electrode 101 and the plate electrode 103 are configured so that the distance d therebetween can be adjusted. For example, the distance d may be 15 mm. The smaller the distance d, the higher the voltage value of the partial discharge that can be obtained. On the other hand, the larger the distance d, the lower the voltage value of the partial discharge that can be obtained.

[0029] FIG. 4 is a diagram showing the results (PRPD pattern) of partial discharges generated by attaching a corona discharge electrode 100 to a partial discharge generator 1 according to an embodiment of the present disclosure. The horizontal axis of the graph in FIG. 4 represents time, and the vertical axis represents voltage. Waveform 120 in FIG. 4 represents the cycle of the power supply, shown here as a 50 Hz sine wave. Also in FIG. 4, plot 130 shows the peak voltages of partial discharges generated in each cycle. In other words, plot 130 is a superposition of the peak voltages of the waveforms of partial discharges generated in each cycle.

[0030] 5 is a schematic diagram showing a void discharge electrode 200 that is detachably attached to the partial discharge generator 1 according to an embodiment of the present disclosure. The void discharge electrode 200 has a first electrode 201, a second electrode 204, and a pair of insulators 210 each having a hole 211 formed therein.

[0031] The first electrode 201 has a first end 202. The first electrode 201 is connected to a pair of insulators 210 at the first end 202. The first electrode 201 and the first end 202 are made of a conductive material such as copper. The first electrode 201 is also connected to the power outlet 21 via a limiting resistor 203. The resistance value of the limiting resistor is, for example, 5 kΩ, but is not limited to this.

[0032] The second electrode 204 has a second end 205. The second electrode 204 is connected to a pair of insulators 210 at the second end 205. The second electrode 204 and the second end 205 are made of a conductive material such as copper. The second electrode 204 is connected to the power outlet 22 via a limiting resistor 206. The resistance value of the limiting resistor is, for example, 5 kΩ, but is not limited to this.

[0033] The pair of insulators 210 is formed of a pair of flat plates of insulators 210. The pair of insulators 210 is formed of an insulating material such as soda water glass. The pair of insulators 210 is connected to the first end 202 of the first electrode 201 and also connected to the second end 205 of the second electrode 204. In other words, the pair of insulators 210 is sandwiched between the first electrode 201 and the second electrode 204. Here, the shape of the first end 202 and the shape of the second end 205 may be any shape. In FIG. 5, the first end 202 and the second end 205 are both flat, but, for example, the first end 202 and the second end 205 may both be spherical. Note that the pair of insulators 210 do not need to be in contact with the first end 202. In other words, there may be a gap between the pair of insulators 210 and the first end 202. Similarly, the second ends 205 of the pair of insulators 210 may not be in contact with the second electrode 204. In other words, there may be a gap between the pair of insulators 210 and the second ends 205.

[0034] A hole 211 is provided in the center of the pair of insulators 210. The hole 211 is a spherical void. In other words, a hemispherical void is provided in each of the pair of insulators 210. The radius of the hole 211 may be, for example, 0.2 mm. The hole 211 is opened, for example, by a drill. This makes it possible to simulate gap-like deterioration of a distribution board. Furthermore, by adjusting the size of the hole 211, the magnitude of the discharge can be changed. Specifically, the smaller the size of the hole 211, the higher the voltage value of the partial discharge that can be obtained. On the other hand, the larger the size of the hole 211, the lower the voltage value of the partial discharge that can be obtained.

[0035] Fig. 6 is a diagram showing the results (PRPD pattern) of partial discharges generated by attaching a void discharge electrode 200 to a partial discharge generator 1 according to an embodiment of the present disclosure. The horizontal axis of the graph in Fig. 6 represents time, and the vertical axis represents voltage. A waveform 220 in Fig. 6 represents the cycle of the power supply, and is shown here as a 50 Hz sine wave. Also in Fig. 6, the peak voltage of the waveform of partial discharges generated in each cycle is shown by a plot 230. In other words, the plot 230 is a superposition of the peak voltages of partial discharges generated in each cycle.

[0036] 7 is a schematic diagram showing a surface discharge electrode 300 that is detachably attached to the partial discharge generator 1 according to an embodiment of the present disclosure. The surface discharge electrode 300 has an insulator 301, a first electrode 302, and a second electrode 303.

[0037] Insulator 301 is made of an insulating material such as epoxy. A first electrode 302 and a second electrode 303 are provided on both ends of insulator 301. First electrode 302 and second electrode 303 are made of a conductive material such as copper. First electrode 302 and second electrode 303 may be flat or non-flat electrodes.

[0038] At least a portion of the insulator 301 is soiled to generate creeping discharge. Any method can be used for soiling. For example, salt water 305 can be sprayed on the insulator, or metal-containing dust can be applied. This makes it possible to simulate the harsh environment of a steel mill. When soiling the insulator by spraying salt water, for example, salt water with a concentration of 3% (equivalent to seawater) can be used.

[0039] FIG. 8 is a diagram showing the results (PRPD pattern) of partial discharges generated by attaching a creeping discharge electrode 300 to a partial discharge generator 1 according to an embodiment of the present disclosure. The horizontal axis of the graph in FIG. 8 represents time, and the vertical axis represents voltage. Waveform 320 in FIG. 8 represents the cycle of the power supply, and is shown here as a 50 Hz sine wave. Also in FIG. 8, plot 330 shows the peak voltage of the waveform of partial discharges generated in each cycle. In other words, plot 330 is a superposition of the peak voltages of partial discharges generated in each cycle.

[0040] In recent years, there has been active development of partial discharge determination techniques using machine learning. However, because partial discharges occur infrequently, it is difficult to build a teacher database of actual partial discharges. Therefore, the mode of a partial discharge that has occurred may be predicted by building a teacher database based on the results of each partial discharge shown in FIGS. 4, 6, and 8. Such a prediction method may be executed by an information processing device or the like. FIG. 9 shows an example of the hardware configuration of an information processing device 400 that executes a partial discharge prediction method according to an embodiment of the present disclosure.

[0041] As shown in FIG. 9, the information processing device 400 includes a control unit 411, a storage unit 412, an input unit 413, an output unit 414, and a communication unit 415.

[0042] The control unit 411 includes at least one processor, at least one dedicated circuit, or a combination thereof. The processor is a general-purpose processor such as a central processing unit (CPU) or a graphics processing unit (GPU), or a dedicated processor specialized for a specific process. The dedicated circuit is, for example, a field-programmable gate array (FPGA) or an application specific integrated circuit (ASIC). The control unit 411 executes processes related to the operation of the information processing device 400 while controlling each unit of the information processing device 400.

[0043] The storage unit 412 includes at least one semiconductor memory, at least one magnetic memory, at least one optical memory, or a combination of at least two of these. The semiconductor memory is, for example, a random access memory (RAM) or a read only memory (ROM). The RAM is, for example, a static random access memory (SRAM) or a dynamic random access memory (DRAM). The ROM is, for example, an electrically erasable programmable read only memory (EEPROM). The storage unit 412 functions as, for example, a main storage device, an auxiliary storage device, or a cache memory. The storage unit 412 stores data used in the operation of the information processing device 400 and data obtained by the operation of the information processing device 400.

[0044] The input unit 413 includes at least one input interface. The input interface is, for example, a physical key, a capacitance key, a pointing device, or a touch screen integrated with a display. The input interface may also be, for example, a sound sensor that accepts voice input, or a camera that accepts gesture input. The input unit 413 accepts an operation to input data used for the operation of the information processing device 400. The input unit 413 may be connected to the information processing device 400 as an external input device instead of being provided in the information processing device 400. As a connection method, any method such as a Universal Serial Bus (USB), a High-Definition Multimedia Interface (HDMI) (registered trademark), or Bluetooth (registered trademark) can be used.

[0045] The output unit 414 includes at least one output interface. The output interface is, for example, a display that outputs information as video, or a speaker that outputs information as audio. The display is, for example, an LCD (liquid crystal display) or an organic EL (electro luminescence) display. The output unit 414 displays and outputs data obtained by the operation of the information processing device 400. The output unit 414 may be connected to the information processing device 400 as an external output device instead of being provided in the information processing device 400. As a connection method, any method such as USB, HDMI (registered trademark), or Bluetooth (registered trademark) can be used.

[0046] The communication unit 415 includes at least one external communication interface. The communication interface may be either a wired communication interface or a wireless communication interface. In the case of wired communication, the communication interface is, for example, a LAN (Local Area Network) interface or a USB (Universal Serial Bus). In the case of wireless communication, the communication interface is, for example, an interface compatible with mobile communication standards such as LTE (Long Term Evolution), 4G (4th generation), or 5G (5th generation), or an interface compatible with short-range wireless communication such as Bluetooth (registered trademark). The communication unit 415 receives data used in the operation of the information processing device 400 and transmits data obtained by the operation of the information processing device 400.

[0047] The functions of the information processing device 400 are realized by executing a program according to this embodiment on a processor corresponding to the information processing device 400. That is, the functions of the information processing device 400 are realized by software. The program causes a computer to execute the operations of the information processing device 400, thereby causing the computer to function as the information processing device 400. That is, the computer functions as the information processing device 400 by executing the operations of the information processing device 400 in accordance with the program.

[0048] In this embodiment, the program can be recorded on a computer-readable recording medium. The computer-readable recording medium includes non-transitory computer-readable media, such as a magnetic recording device, an optical disc, a magneto-optical recording medium, or a semiconductor memory. The program can be distributed, for example, by selling, transferring, or lending a portable recording medium, such as a DVD (digital versatile disc) or a CD-ROM (compact disc read only memory), on which the program is recorded. The program can also be distributed by storing the program in the storage of an external server and transmitting the program from the external server to another computer. The program can also be provided as a program product.

[0049] Some or all of the functions of the information processing device 400 may be implemented by a dedicated circuit equivalent to the control unit 411. In other words, some or all of the functions of the information processing device 400 may be implemented by hardware.

[0050] (Operation of information processing device) The operation of the information processing device 400 according to this embodiment will be described with reference to FIG.

[0051] Step S1: The control unit 411 of the information processing device 400 acquires sensor data related to partial discharge. Any method can be used for the process of acquiring the sensor data. For example, the control unit 411 may acquire, via the communication unit 415, sensor data detected by a partial discharge detection device such as a TEV sensor.

[0052] Step S2: The control unit 411 predicts the type and risk of partial discharge based on the trained model. Specifically, the control unit 411 inputs the sensor data acquired in step 1 into the trained model, and thereby obtains from the trained model a prediction result as to whether the type of partial discharge is corona discharge, void discharge, or creeping discharge. The control unit 411 also inputs the sensor data acquired in step 1 into the trained model, and thereby obtains from the trained model a prediction result regarding the risk of partial discharge.

[0053] The trained model is a model trained by a predetermined machine learning algorithm using the results of each partial discharge shown in Figures 4, 6, and 8 as training data. The results of each partial discharge may be input to the trained model as image data, for example, or the numerical data of each plot may be input to the training model. When predicting the mode of partial discharge, the training data includes information related to the mode of partial discharge. When predicting the risk of partial discharge, the training data includes a label related to the risk.

[0054] The trained model may be a model generated based on a machine learning algorithm such as random forest, support vector machine (SVM), regression, convolutional neural network (CNN), recurrent neural network (RNN), or other deep learning. Alternatively, the trained model may be a machine learning model built based on a decision tree. Examples of machine learning models built based on a decision tree include, but are not limited to, Light GBM and XGBoost.

[0055] Step S3: The control unit 411 outputs the prediction result predicted by the trained model. Any method can be used to output the information. For example, the control unit 411 may output the information by displaying it on the output unit 414.

[0056] The above prediction method can predict the nature of partial discharges occurring in a switchboard, thereby assisting in identifying the locations of partial discharges in the switchboard. FIG. 11 is a schematic diagram showing an example of a switchboard 500. The switchboard 500 includes a current transformer 510, a zero-phase current transformer 520, a surge absorber 530, a bus 540, and a vacuum circuit breaker 550. The current transformer 510 appropriately converts the magnitude of the current flowing through the switchboard 500. The zero-phase current transformer 520 detects imbalances in the current flowing through the switchboard 500. For example, the zero-phase current transformer 520 detects currents in the event of abnormalities such as ground faults and ground leakage. The surge absorber 530 absorbs or deflects excessive voltages from the outside, such as those caused by lightning, to protect the equipment in the switchboard 500. The bus 540 is the main transmission path connecting each circuit in the switchboard with power. Power is distributed to each section in the switchboard 500 via a bus 540. In Fig. 11, a partial discharge in the switchboard 500 is detected by a sensor 601 of a partial discharge detection device 600.

[0057] For example, if the predicted type of partial discharge is corona discharge, it is possible that connection points 503, 504 of cables 501, 502 connecting current transformer 510 and zero-phase current transformer 520 have deteriorated or that connection bolts have loosened. In this case, measures such as retightening the bolts at connection points 503, 504 can be taken. If the predicted type of partial discharge is void discharge, it is possible that insulators such as insulator 505 of current transformer 510 or insulator 506 of zero-phase current transformer 520 have deteriorated. In this case, measures such as replacing insulator 505, insulator 506 can be taken. If the predicted type of partial discharge is creeping discharge, it is highly likely that the cause is dirt on the surface of insulators such as insulator 505 of current transformer 510 or insulator 506 of zero-phase current transformer 520. In this case, measures can be taken such as cleaning the insulators, such as the insulator 505 of the current transformer 510 or the insulator 506 of the zero-phase current transformer 520. Furthermore, by predicting the risk of partial discharge, flexible measures can be taken, such as adjusting the timing of replacing replacement parts, depending on the predicted risk. For example, when acquiring training data, the position of the partial discharge generator 1 may be changed to build a training database. In this case, information on the position of the partial discharge generator 1 may be included in the training database. In this way, the location of the partial discharge may be identified by the trained model.

[0058] As described above, the partial discharge generator 1 according to this embodiment includes a power supply generating circuit 10 that is connected to a power supply to generate a high voltage, and a pair of power outlets 20 that are connected to the power supply generating circuit 10. The pair of power outlets 20 are characterized by being configured so that electrodes corresponding to a plurality of discharge forms can be attached and detached. With this configuration, the power outlet 20 is configured so that electrodes corresponding to a plurality of discharge forms can be attached and detached, making it possible to easily generate partial discharges of a plurality of discharge forms. Furthermore, partial discharge experiments that were previously only possible in high-voltage facilities or research facilities can now be performed on a desk, allowing students and new employees to easily learn about partial discharge waveforms, propagation characteristics, etc., which is also effective in human resource development.

[0059] Although the present disclosure has been described based on the drawings and examples, it should be noted that those skilled in the art may make various modifications and alterations based on the present disclosure. Therefore, it should be noted that these modifications and alterations are included in the scope of the present disclosure. For example, the functions included in each component or step can be rearranged so as not to be logically inconsistent, and multiple components or steps can be combined or divided into one.

[0060] The period of the pulse voltage is controlled by the microcomputer 11 to be synchronized with a predetermined frequency (e.g., 50 Hz or 60 Hz). Alternatively, the microcomputer 11 detects the dielectric voltage in the distribution board via the antenna 17 and outputs a pulse voltage synchronized with the dielectric voltage. Specifically, the microcomputer 11 controls the period of the switching signal using a timer interrupt and an internal clock, and operates to obtain a pulse voltage at a desired period from the voltage terminal 16 through the coil 14 and the Cockcroft rectifier circuit 15. In other words, the microcomputer controls the high voltage output from the power generation circuit in synchronization with the predetermined frequency. The predetermined frequency may be 50 Hz, 60 Hz, or the period of the dielectric voltage in the distribution board. Here, the predetermined frequency is not necessarily limited to 50 Hz or 60 Hz and may be set arbitrarily depending on the user's settings, the device connection environment, etc. For example, a configuration in which a frequency other than 50 Hz or 60 Hz is set to synchronize with the timing of other devices is also conceivable. Furthermore, the microcomputer 11 may be configured to be able to select any one of these control methods, allowing for flexible operation according to the site environment, purpose, etc. [Explanation of symbols]

[0061] 1 Partial discharge generator 10 Power supply generation circuit 11 Microcomputer 12 transistors 13 Batteries 14 coils 15 Cockcroft rectifier circuit 16 Voltage terminal 17 Antenna 20 Pair of power outlets 21, 22 Power outlet 30 Synchronous signal input section 40 Power button 50 Power selection button 60 Power supply selection status display 61 1st LED 62 Second LED 100 Corona discharge electrodes 101 Needle electrode 102 Limiting Resistor 103 Flat electrode 120 waveforms 130 plots 200 Electrode for void discharge 201 1st electrode 202 First end 203 Limiting Resistor 204 2nd electrode 205 Second end 206 Limiting Resistor 210 Pair of insulators 211 hole 220 waveform 230 plots 300 Electrode for surface discharge 301 Insulator 302 1st electrode 303 2nd electrode 305 Saltwater 320 waveform 330 plots 400 Information processing equipment 411 Control Unit 412 Storage section 413 Input section 414 Output Section 415 Communications Department 500 Switchboard 501, 502 cables 503, 504 connection points 505, 506 Insulators 510 Current Transformer 520 Zero phase current transformer 530 Surge absorber 540 busbar 550 Vacuum Circuit Breaker 600 Partial discharge detection device 601 Sensor

Claims

1. a power supply generating circuit connected to the power supply to generate a high voltage; a pair of power outlets connected to the power generating circuit; and The partial discharge generating device is characterized in that the pair of power outlets are configured to allow detachable attachment of electrodes corresponding to a plurality of discharge forms.

2. the electrodes include electrodes for corona discharge; The corona discharge electrodes include a needle electrode and a flat electrode, 2. The partial discharge generating device according to claim 1, wherein the distance between the needle electrode and the plate electrode is adjustable.

3. the electrodes include electrodes for void discharge, 2. The partial discharge generator according to claim 1, wherein the electrodes for void discharge have a first electrode, a second electrode, and a pair of insulators having holes formed therein, and the pair of insulators are sandwiched between the first electrode and the second electrode.

4. the electrodes include electrodes for surface discharge, 2. The partial discharge generating device according to claim 1, wherein the electrodes for creeping discharge are composed of an insulator and electrodes provided on both ends of the insulator.

5. the power supply generating circuit includes a microcomputer; 2. The partial discharge generator according to claim 1, wherein the microcomputer controls the high voltage output from the power supply generating circuit in synchronization with a predetermined frequency.

6. 6. The partial discharge generator according to claim 5, wherein the predetermined frequency is 50 Hz, 60 Hz, or a cycle of a commercial voltage in a distribution panel.

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