JP2021188934A - Partial discharge detector, partial discharge detection method and partial discharge detection program - Google Patents

Abstract

To provide a partial discharge detection device, a partial discharge detection method, and a partial discharge detection program, which can identify a generation portion of partial discharge by asynchronously measuring the potential of a plurality of portions.SOLUTION: A partial discharge detection device includes a feature amount acquisition section, a statistical processing section, and a partial discharge diagnostic section. The feature amount acquisition section acquires a feature amount of a signal waveform for each of partial discharge signals detected in a plurality of portions to be detected. The statistical processing section acquires statistical data of the feature amount for each of the plurality of portions. The partial discharge diagnostic section identifies a generation source of detected partial discharge by comparing statistical data acquired for the plurality of portions.SELECTED DRAWING: Figure 2

Description

Embodiments of the present invention relate to a partial discharge detection device, a partial discharge detection method, and a partial discharge detection program.

Due to aging of electric power equipment, the insulation performance of the insulator on the surface or inside thereof deteriorates. When the insulation performance deteriorates, partial discharge occurs at the location where the insulation performance deteriorates. If the insulation performance deteriorates further, dielectric breakdown occurs in the electric power equipment. Dielectric breakdown causes serious accidents such as ground faults. In order to prevent the occurrence of such a serious accident, partial discharge is detected in the maintenance and maintenance of electric power equipment.

Conventionally, in an electric power device such as a switchgear in which a circuit breaker or the like is housed in a box, a plurality of partial discharge sensors are attached to the box to specify the position where a partial discharge occurs. The partial discharge sensor is a sensor that detects a pulse signal of partial discharge propagating through stray capacitance. In this case, the three-dimensional position can also be specified from the time difference from the generation position to the arrival of the partial discharge pulse signal at the partial discharge sensor.

Further, it is known that a switchgear in which an electric member such as a conductor constituting a main circuit is molded with an insulating material has a plurality of electrodes and detects a partial discharge based on a potential difference between the electrodes. Specifically, a plurality of electrodes for detecting the surface potential are provided on the surface of the ground layer, a predetermined one is used as a reference electrode, another is used as a measurement electrode, and the surface potential of the measurement electrode is subtracted from the reference electrode to obtain a potential difference. Ask for. Furthermore, one of the pair of electrodes that detect the surface potential is placed on the surface of the ground layer, and the other is placed in non-contact with the ground layer, and the difference between these outputs is taken to obtain the S / N ratio (Signal to Noise Ratio). It is also known to improve.

In these conventional methods for detecting partial discharge, it is necessary to measure the potentials of multiple parts at the same time with multiple sensors and input the detection signals to the partial discharge measurement system at once for high-speed calculation, which makes the device expensive. It was. Also, in actual inspection work, it is common for an inspector to repeatedly install and measure sensors for each adjacent box, and a method for detecting partial discharge that requires simultaneous measurement with multiple sensors. Was not suitable for actual operation in some cases.

Japanese Unexamined Patent Publication No. 2011-149896 Japanese Unexamined Patent Publication No. 2012-220209 Japanese Unexamined Patent Publication No. 2012-220208

An object to be solved by the present invention is to provide a partial discharge detection device, a partial discharge detection method, and a partial discharge detection program capable of identifying a partial discharge generation site by asynchronous measurement of potentials of a plurality of sites.

The partial discharge detection device of the embodiment has a feature amount acquisition unit, a statistical processing unit, and a partial discharge diagnosis unit. The feature amount acquisition unit acquires the feature amount related to the signal waveform for each of the partial discharge signals detected at the plurality of sites to be detected. The statistical processing unit acquires statistical data of the feature amount for each of the plurality of sites. The partial discharge diagnosis unit identifies the source of the detected partial discharge by comparing the statistical data acquired for the plurality of sites.

The figure which shows the structural example of the partial discharge detection apparatus of an embodiment. The block diagram which shows the structural example of the signal processing circuit in the partial discharge detection apparatus of an embodiment. FIG. 1 is a first diagram showing a specific example of a method in which the partial discharge detection device of the embodiment detects a partial discharge signal. FIG. 2 is a second diagram showing a specific example of a method in which the partial discharge detection device of the embodiment detects a partial discharge signal. The flowchart which shows the specific example of the process which detects the partial discharge of the power-source system which consists of a plurality of boxes by the partial discharge detection apparatus of embodiment. The figure which shows the specific example of the method which the partial discharge detection apparatus of embodiment identifies the box body in which a partial discharge occurred based on the statistical data of a partial discharge signal.

Hereinafter, the partial discharge detection device, the partial discharge detection method, and the partial discharge detection program of the embodiment will be described with reference to the drawings.

FIG. 1 is a diagram showing a configuration example of the partial discharge detection device 100 of the embodiment. The partial discharge detection device 100 includes a plurality of boxes 1, a plurality of electrodes 2, and a signal processing circuit 3. The partial discharge detection device 100 shown in FIG. 1 includes a first to nth (n is an integer of 1 or more) box 1 (box 1-1 to 1-n) as an example of a plurality of boxes 1. There is. Electrical equipment such as a circuit breaker and a main circuit conductor is housed in each of the first to nth boxes 1. The first to nth boxes 1 are arranged side by side in a substantially straight line to form a predetermined power supply system. Further, the first to nth boxes 1 have a common grounding bus 5 at the lower portion thereof, and are connected to the grounding electrode 6 via the grounding bus 5.

Further, in the partial discharge detection device 100 shown in FIG. 1, the first to nth electrodes 2 (electrodes 2-1 to 2 to 1) provided one by one in each of the first to nth boxes 1 as an example of the plurality of electrodes 2. 2-n) is provided. One end of each of the first to nth electrodes 2 is fixed so as to be in contact with the corresponding box body 1, and the other end is connected to the signal processing circuit 3. Here, the "corresponding box body 1" represents a box body 1 in which each electrode 2 is installed for each of the first to nth electrodes 2. For example, the box body 1 corresponding to the electrode 2-1 is a box body 1-1 in which the electrode 2-1 is installed. In other words, the box body 1 corresponding to the Nth (1 ≦ N ≦ n) electrode 2 can be said to be the Nth box body 1 (box body 1-N). In the following, unless otherwise specified, the first to nth box bodies 1 may be collectively referred to as “box body 1”, and the first to nth electrodes 2 may be collectively referred to as “electrode 2”. Further, in this case, the box body 1 in which a certain electrode 2 is installed is simply referred to as "the box body 1 corresponding to the electrode 2".

The electrode 2 receives a signal according to the potential formed on the surface of the box 1 through the stray capacitance between the electrode 2 and the electric device housed in the corresponding box 1 (hereinafter referred to as “surface potential signal”). It has a function to output. The electrode 2 outputs a surface potential signal to the signal processing circuit 3. The signal processing circuit 3 has a function of detecting a weak signal indicating partial discharge (hereinafter referred to as “partial discharge signal”) from the surface potential signal output from the first to nth electrodes 2.

Here, the first to nth box bodies 1 are composed of a front plate, a ceiling plate, a back plate, a floor plate, and a side plate, and the first to nth electrodes 2 come into contact with any of the plate surfaces. It is fixed as. For example, FIG. 1 shows an example in which the electrode 2 is fixedly installed so as to be in contact with the front plate of the box body 1, and the floor plate of the box body 1 is connected to the grounding bus 5. Hereinafter, these front plates, ceiling plates, back plates, floor plates, and side plates are collectively referred to as "constituent plates" constituting the box body 1.

FIG. 2 is a block diagram showing a configuration example of a signal processing circuit in the partial discharge detection device of the present embodiment. For example, the signal processing circuit 3 includes a CPU (Central Processing Unit), a memory, an auxiliary storage device, and the like connected by a bus, and executes a program. The signal processing circuit 3 has a storage unit 31, a high pass filter (HPF: High Pass Filter) 32, a low pass filter (LPF: Low Pass Filter) 33, a feature amount acquisition unit 34, a statistical processing unit 35, and a partial discharge diagnosis by executing a program. It functions as a device including the unit 36. The signal processing circuit 3 inputs a surface potential signal from the first to nth electrodes 2 and outputs diagnosis result information. The diagnosis result information is information indicating the diagnosis result regarding the presence / absence of partial discharge in the power supply system composed of the first to nth boxes 1.

All or part of each function of the signal processing circuit 3 may be realized by using hardware such as ASIC (Application Specific Integrated Circuit), PLD (Programmable Logic Device), FPGA (Field Programmable Gate Array), and the like. .. The program may be recorded on a computer-readable recording medium. The computer-readable recording medium is, for example, a flexible disk, a magneto-optical disk, a portable medium such as a ROM or a CD-ROM, or a storage device such as a hard disk built in a computer system. The program may be transmitted over a telecommunication line.

The storage unit 31 is configured by using a magnetic storage device such as an HDD (Hard Disk Drive) or a semiconductor storage device such as an SSD (Solid State Drive). Arbitrary information regarding the operation of the signal processing circuit 3 can be recorded in the storage unit 31. Information regarding the operation of the signal processing circuit 3 may be stored in advance in the storage unit 31.

The high-pass filter 32 and the low-pass filter 33 are functional units that extract signal components in a predetermined frequency band from the input signal. The high-pass filter 32 extracts a signal component in a relatively high frequency band, and the low-pass filter 33 extracts a signal component in a relatively low frequency band. A surface potential signal of n systems is input to the signal processing circuit 3 from the first to nth electrodes 2. The n-system surface potential signal input to the signal processing circuit 3 is decomposed into a high-frequency signal and a low-frequency signal by the high-pass filter 32 and the low-pass filter 33. The n-system high-frequency signal and low-frequency signal decomposed by the high-pass filter 32 and the low-pass filter 33 are output to the feature amount acquisition unit 34 in the subsequent stage.

The feature amount acquisition unit 34 inputs the high-frequency signal and the low-frequency signal of n systems from which the surface potential signal is decomposed from the high-pass filter 32 and the low-pass filter 33. The feature amount acquisition unit 34 attempts to detect a partial discharge signal from the input high frequency signal and low frequency signal. The feature amount acquisition unit 34 measures the feature amount of the detected partial discharge signal each time the partial discharge signal is detected, and outputs the measurement data (hereinafter referred to as “feature amount data”) to the statistical processing unit 35. do. The detection of the partial discharge signal and the measurement of the feature amount may be performed at any timing for the surface potential signal of n systems.

The statistical processing unit 35 inputs the feature amount data of the partial discharge signal detected at an arbitrary timing for the box body 1 of the n system from the feature amount acquisition unit 34 and accumulates it in the storage unit 31 and at a predetermined period. By repeatedly executing statistical processing on the acquired feature amount data, the storage unit 31 has a function of accumulating the statistical data of the feature amount in time series. Any statistical value may be used for the acquisition of statistical data as long as the variation in the feature amount can be leveled. For example, statistical values such as an average value, a median value, a mode value, a minimum value, and a maximum value can be used for acquiring statistical data.

The partial discharge diagnosis unit 36 has a function of specifying the location where the partial discharge is generated detected by the feature amount acquisition unit 34 based on the statistical data stored in the storage unit 31. Hereinafter, this function is referred to as a partial discharge diagnostic function. The partial discharge diagnosis unit 36 outputs the diagnosis result information indicating the diagnosis result of the partial discharge in a predetermined mode. For example, the partial discharge diagnosis unit 36 may display the contents of the diagnosis result on the display device by outputting the diagnosis result information according to the input format of the display device, or the diagnosis may be performed according to the input format of the voice output device. By outputting the result information, a voice indicating the content of the diagnosis result may be output to the voice output device. Further, for example, the partial discharge diagnosis unit 36 may be configured to transmit the diagnosis result information to another device via the communication network.

3 and 4 are diagrams showing a method in which the partial discharge detection device 100 of the present embodiment detects a partial discharge signal. FIG. 3 is a diagram showing a specific example of the frequency characteristic of the partial discharge signal. As shown in FIG. 3, when a partial discharge occurs, generally, in the surface potential signal detected by the electrode 2, a low frequency signal derived from a ground current having a main component in a frequency band of several MHz to several tens of MHz is used. , A high frequency signal derived from an electromagnetic wave having a main component in a frequency band of 100 MHz or more is generated at the same time. Here, the low frequency signal derived from the ground current is propagated through the ground bus 5 and has a low detection sensitivity because it competes with the background noise (broken line in the figure) in the ground field. On the other hand, the high frequency signal has high detection sensitivity with respect to the background noise in the ground field. That is, the S / N ratio is low in the low frequency signal, and the S / N is high in the high frequency signal.

Therefore, as shown in FIG. 4, the partial discharge detection device 100 of the present embodiment matches the signal waveform (amplitude waveform) between the high frequency signal and the low frequency signal, and the potential difference of the threshold value or more is generated at the same timing. By providing a configuration for detecting a location, it is possible to specify the timing at which a partial discharge occurs.

FIG. 5 is a flowchart showing a specific example of a process in which the partial discharge detection device 100 of the present embodiment detects a partial discharge of a power supply system composed of a plurality of boxes 1. First, the surface potential signal measured for the first to nth boxes 1 is input to the signal processing circuit 3 (step S101). The surface potential signals of n systems input to the signal processing circuit 3 may be measured at the same timing for all systems, or may be measured at different timings for some systems. ..

Subsequently, in the signal processing circuit 3, the high-pass filter 32 and the low-pass filter 33 extract high-frequency signals and low-frequency signals for each of the n-system input signals (step S102). The high-pass filter 32 and the low-pass filter 33 output the detected high-frequency signal and low-frequency signal to the feature amount acquisition unit 34 in the subsequent stage.

Subsequently, the feature amount acquisition unit 34 inputs a high-frequency signal and a low-frequency signal from the high-pass filter 32 and the low-pass filter 33, and attempts to detect a partial discharge signal from the input high-frequency signal and low-frequency signal (step S103). On the other hand, when the partial discharge signal is not detected in step S103 (step S103-NO), the process is returned to step S101. On the other hand, when the partial discharge signal is detected (step S103-YES), the feature amount acquisition unit 34 measures the feature amount of the detected partial discharge signal (step S104). The feature amount acquisition unit 34 outputs the feature amount measurement data (hereinafter referred to as “feature amount data”) to the statistical processing unit 35. The detection of the partial discharge signal and the measurement of the feature amount may be performed at an arbitrary timing for the surface potential signal of n systems.

For example, the feature amount acquisition unit 34 measures the peak value and the phase of the low frequency signal as the feature amount of the partial discharge signal detected by the matching. This measurement is performed each time a partial discharge signal is detected. Since the surface potential of the box 1 fluctuates in correlation with the operating voltage of the power system, and the phase of the surface potential signal and the phase of the operating voltage are generally the same, the phase of the low frequency signal is the operating voltage of the power system. It is good to judge by referring to.

Generally, when a board in which a partial discharge occurs is specified in a power system composed of a plurality of boxes (hereinafter, also referred to as "board"), it is also referred to as an electrode (hereinafter, also referred to as "sensor") attached to each board. ) Simultaneously detects the surface potential signal of each panel and compares the magnitude of the peak value of the detected surface potential signal between different systems, whereas the partial discharge detection device 100 of the present embodiment has. , Instead of (or in addition) accumulating the detected partial discharge signal itself, by accumulating statistical data of the partial discharge signal, based on the result of asynchronously measuring the surface potentials of a plurality of boxes 1. It makes it possible to identify the site where the partial discharge occurs.

Specifically, the statistical processing unit 35 performs statistical processing on the feature amount data acquired for a predetermined time for each system, and accumulates the statistical data as the processing result in the storage unit 31 (step). Together with S105), the partial discharge diagnosis unit 36 identifies the location where the partial discharge occurs based on the accumulated statistical data (step S106).

Here, in order to prevent variations in statistical accuracy for each system, it is desirable that the surface potential of each box 1 be measured at the same measurement cycle. Further, in order to more accurately grasp the tendency of the partial discharge signal, it is desirable that the surface potential of each box 1 is measured for about 100 cycles of the operating voltage.

By providing such a statistical processing unit 35 and a partial discharge diagnosis unit 36, the partial discharge detection device 100 of the present embodiment is a box in which a partial discharge occurs without simultaneously measuring the surface potentials of the plurality of boxes 1. It becomes possible to identify the body 1.

FIG. 6 is a diagram showing a specific example of a method in which the partial discharge detection device of the present embodiment identifies the box body 1 in which the partial discharge has occurred based on the statistical data of the partial discharge signal. Here, for the sake of simplicity, a case where the location where the partial discharge occurs is specified based on the surface potential signals of the three adjacent boxes 1 will be described. In FIG. 6A, three adjacent box bodies 1- (k-1), box body 1-k, and box body 1- (k + 1) have surface potential signals X (k-1) and X (k), respectively. , X (k + 1) is output to the signal processing circuit 3. k is an integer of 2 or more and (n-1) or less.

On the other hand, FIG. 6B shows statistical data X (k-1), X (k), X (k + 1) acquired for the surface potential signals Y (k-1), Y (k), Y (k + 1). A concrete example of is shown. As described above, the statistical data is obtained by leveling the variation in the feature amount of the partial discharge signal detected from the surface potential signal. In the case of this example, the partial discharge diagnosis unit 36 determines the phase and wave of the signal when the partial discharge occurs for the adjacent boxes 1- (k-1), 1-k, and 1- (k + 1). By comparing the high value (discharge charge amount Q), the following items (diagnosis 1) and (diagnosis 2) can be diagnosed.

(Diagnosis 1)
The statistical data X (k-1) and X (k) represent the same partial discharge, and the source of the partial discharge is the box body 1-k corresponding to the statistical data X (k).
(Diagnosis 2)
Statistical data X (k + 1) represents a partial discharge different from statistical data X (k-1) and X (k).

Specifically, regarding the content of (diagnosis 1), the distributions of the phases φ of the statistical data X (k-1) and X (k) are the same (that is, the detection timing of the partial discharge can be regarded as the same), and Diagnosis can be made by determining that the peak value of X (k) is larger than that of the statistical data X (k-1). On the other hand, the content of (diagnosis 2) can be diagnosed by determining that the distributions of the phases φ of the statistical data X (k) and X (k + 1) are different.

In the conventional partial discharge detection device, it is necessary to simultaneously input the surface potential signal of each box 1 necessary for identifying the source of the partial discharge. Therefore, when an attempt is made to acquire the surface potential signal asynchronously with a conventional partial discharge detection device, a storage capacity sufficient to hold the surface potential signal for a predetermined period for each system is required, and the device is expensive. There was a possibility that it would become.

On the other hand, the partial discharge detection device 100 of the present embodiment detects the partial discharge signal from the surface potential signals measured for the plurality of boxes 1 constituting the power system, and the feature amount of the detected partial discharge signal. Has a function to extract. Here, the partial discharge signal is a part of the surface potential signal, and the amount of data of the feature amount extracted from the partial discharge signal is often smaller than the surface potential signal or the partial discharge signal of the extraction source. Therefore, instead of accumulating the surface potential signal itself, by accumulating a part of the partial discharge signal and further accumulating the feature amount of the partial discharge signal, information for a longer period with a smaller storage capacity is obtained. Can be accumulated. By providing such a configuration, the partial discharge detection device 100 of the present embodiment can identify the portion where the partial discharge occurs by asynchronously measuring the potentials of a plurality of portions.

Further, the partial discharge detection device 100 of the present embodiment has a function of acquiring the feature amount of the accumulated partial discharge signal as statistical data for a predetermined period. Partial discharges are considered to occur periodically at the same location, but the timing of occurrence and the strength of the generated discharges often vary from generation to generation. Therefore, as in the partial discharge detection device 100 of the present embodiment, by acquiring the statistical data of the feature amount of each partial discharge signal generated in a predetermined period as the data to be accumulated for the diagnosis of the partial discharge, the partial discharge It is possible to grasp the tendency of the occurrence of. By providing such a configuration, the partial discharge detection device 100 of the present embodiment can detect the source of the partial discharge more accurately.

<Modification example>
The partial discharge detection device 100 of the above embodiment uses the low frequency signal at the timing of occurrence of the partial discharge as the partial discharge signal, and acquires the peak value and the phase of the low frequency signal as the feature quantities of the partial discharge signal. Instead, the partial discharge detection device 100 may be configured to use the high frequency signal at the timing of occurrence of the partial discharge as the partial discharge signal and acquire the peak value and phase of the high frequency signal as the feature amount of the partial discharge signal. good. Further, the partial discharge detection device 100 acquires a signal acquired based on the low frequency signal and the high frequency signal at the timing of occurrence of the partial discharge as the partial discharge signal, and acquires the peak value and the phase of the signal as the feature quantity of the partial discharge signal. It may be configured to do so.

The partial discharge detection device 100 of the above embodiment identifies the source of the partial discharge by comparing the statistical data acquired for the adjacent boxes 1. Alternatively, the partial discharge detection device 100 may be configured to identify the source of the partial discharge by comparing the statistical data acquired for the boxes 1 that are spaced apart at the same interval. For example, when a plurality of box bodies 1 are adjacent to each other in the order of box bodies 1-1, 1-2, ..., 1-n (see FIG. 1), the partial discharge detection device 100 can be used from these statistical data groups. Statistical data may be sampled every other statistical data, and the source of the partial discharge may be specified by comparing the statistical data adjacent to each other in the sampled statistical data group. More specifically, in this case, the partial discharge detection device 100 samples statistical data of, for example, a box body 1-1, a box body 1-3, a box body 1-5, a box body 1-7, ... Comparing adjacent statistical data such as body 1-1 and box 1-3, box 1-3 and box 1-5, and box 1-5 and box 1-7. In this way, by sampling the statistical data of the adjacent boxes 1 at the same interval, the amount of data handled when identifying the source of the partial discharge can be reduced, and the time required for the diagnosis of the partial discharge can be shortened. can.

The partial discharge detection device 100 of the above embodiment may be provided with a configuration for specifying the source of the partial discharge by the same method as in the conventional method. Specifically, the partial discharge detection device 100 may have a configuration in which the surface potential signal of each box 1 is simultaneously input, the partial discharge is identified by comparing the waveforms thereof, and the source of each partial discharge is specified. good.

The partial discharge detection device 100 may be configured as a device that receives a surface potential signal as an input and outputs a diagnosis result information. That is, the partial discharge detection device 100 may be configured as a device including the signal processing circuit 3 in the above embodiment, and does not necessarily have to be integrally provided with the electrode 2 for measuring the surface potential signal.

According to at least one embodiment described above, for each of the partial discharge signals detected in the plurality of parts to be detected, the feature amount acquisition unit for acquiring the feature amount related to the signal waveform and the feature for each of the plurality of parts. By having a statistical processing unit that acquires quantitative statistical data and a partial discharge diagnosis unit that identifies the source of the detected partial discharge by comparing the statistical data acquired for the plurality of parts. The site where partial discharge occurs can be identified by asynchronous measurement of the potential of the site.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and variations thereof are included in the scope of the invention described in the claims and the equivalent scope thereof, as are included in the scope and gist of the invention.

100 ... Partial discharge detector, 1, 1-1-1 to 1-n ... Box body, 2, 2-1 to 2-n ... Electrode, 3 ... Signal processing circuit, 31 ... Storage unit, 32 ... High-pass filter, 33 ... Low-pass filter, 34 ... feature quantity acquisition unit, 35 ... statistical processing unit, 36 ... partial discharge diagnosis unit, 5 ... ground bus, 6 ... ground electrode.

Claims (9)

A feature amount acquisition unit that acquires a feature amount related to a signal waveform for each of the partial discharge signals detected at a plurality of detection target sites, and a feature amount acquisition unit.
A statistical processing unit that acquires statistical data of the feature amount for each of the plurality of parts,
By comparing the statistical data acquired for the plurality of sites, the partial discharge diagnosis unit that identifies the source of the detected partial discharge and the partial discharge diagnosis unit
A partial discharge detector. The partial discharge diagnosis unit identifies the source of the partial discharge by comparing the statistical data acquired for the adjacent parts of the plurality of parts.
The partial discharge detection device according to claim 1. The partial discharge diagnosis unit samples the statistical data acquired for the parts separated at the same interval from the statistical data acquired for the plurality of parts, and compares the sampled statistical data to determine the source of the partial discharge. Identify,
The partial discharge detection device according to claim 1 or 2. The statistical processing unit acquires the peak value and the phase of the partial discharge signal as the feature amount.
The partial discharge detection device according to any one of claims 1 to 3. The partial discharge diagnostic unit identifies the partial discharge signals having the same phase statistics as those due to the same partial discharge, and the plurality of the partial discharge signals are determined by the magnitude relationship of the peak values of the partial discharge signals identified as being due to the same partial discharge. Identify the part of the part that is the source of the partial discharge,
The partial discharge detection device according to claim 4. A high-pass filter that extracts high-frequency signals from surface potential signals detected at multiple sites to be detected, and
A low-pass filter that extracts low-frequency signals from the surface potential signal,
Further prepare
The feature amount acquisition unit detects the partial discharge signal based on the high frequency signal and the low frequency signal.
The partial discharge detection device according to any one of claims 1 to 5. The feature amount acquisition unit acquires the peak value and phase of the high frequency signal or the low frequency signal as the feature amount.
The partial discharge detection device according to claim 6. A feature amount acquisition step for acquiring a feature amount related to a signal waveform for each of the partial discharge signals detected at a plurality of parts to be detected, and a feature amount acquisition step.
A statistical processing step for acquiring statistical data of the feature amount for each of the plurality of sites, and
A partial discharge diagnostic step that identifies the source of the detected partial discharge by comparing the statistical data acquired for the plurality of sites.
Partial discharge detection method having. A feature amount acquisition step for acquiring a feature amount related to a signal waveform for each of the partial discharge signals detected at a plurality of parts to be detected, and a feature amount acquisition step.
A statistical processing step for acquiring statistical data of the feature amount for each of the plurality of sites, and
A partial discharge diagnostic step that identifies the source of the detected partial discharge by comparing the statistical data acquired for the plurality of sites.
A computer program that lets your computer run.

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