Discharge detection and determination system, discharge detection circuit, and discharge detection method

Abstract

The device is less subject to size restrictions on where it can be installed and can accurately detect the discharge waveforms of minute discharges that can occur at multiple locations in electrical equipment, thereby contributing to improved reliability of electrical equipment. [Solution] A discharge detection and determination system having a discharge detection circuit that detects discharges occurring within electrical equipment and a computer that determines the type of discharge detected, wherein the discharge detection circuit has a first capacitor, first to third impedance elements, and an amplifier, one end of the first capacitor is connected to the input side of the discharge detection circuit and the other end is connected to the first impedance element, the first and third impedance elements and the amplifier form an inverting amplifier circuit, and one end of the second impedance element is connected to the amplifier to form a noise gain path.

Description

[Technical Field]

[0001] The present invention relates to a discharge detection and determination system, a discharge detection circuit, and a discharge detection method. [Background technology]

[0002] Abnormal discharges in high-voltage electrical equipment, such as industrial equipment and power distribution facilities, can lead to serious accidents. For this reason, systems that detect minute discharges, which are a sign of discharges occurring in electrical equipment, have been put into practical use.

[0003] Furthermore, to identify the type of discharge, it is necessary to accurately detect the discharge waveform and perform various signal processing. For this reason, current systems for detecting minute discharges require a large, high-capacity, high-voltage capacitor to enable detection of low-frequency band signals.

[0004] Patent Document 1 discloses a technology related to the detection of arc discharge. Specifically, Patent Document 1 states that "the device includes a detector that acquires time-series data related to feature quantities such as voltage and current in a circuit that is the target of arc detection, basic data generation means that generates basic data consisting of multiple frequency components from the acquired time-series data through frequency analysis, data processing means that converts the generated basic data into an evaluation value that is highly correlated with arc occurrence by statistically processing the generated basic data, and arc determination means that determines the occurrence of an arc when the evaluation value exceeds a predetermined arc determination threshold." [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-278744 Summary of the Invention [Problem to be solved by the invention]

[0006] In electrical equipment that handles high voltages, there are multiple locations where discharges are expected to occur, and from the perspective of safety and stable operation, it is desirable to sense all of the expected discharge locations. However, current systems for detecting microdischarges use large, high-capacity, high-voltage capacitors, which make it difficult to place them at all expected discharge locations due to size constraints, and placing multiple capacitors results in an increase in the size of the electrical equipment, which is a problem. Therefore, there is a need for a compact discharge detection means that can accurately detect the discharge waveform of microdischarges.

[0007] In the technology described in Patent Document 1, arc discharge is detected by a detector, but the miniaturization of the detector, which is the discharge detection means, is not taken into consideration. Therefore, it is considered difficult to solve the above-mentioned problem with the technology described in Patent Document 1.

[0008] The present invention has been made in consideration of the above-mentioned problems, and aims to contribute to improving the reliability of electrical equipment by making it possible to accurately detect discharge waveforms of micro-discharges that can occur at multiple locations in electrical equipment, while being less subject to size constraints on the location where it is placed. [Means for solving the problem]

[0009] The present application includes a plurality of means for solving at least part of the above-mentioned problems, examples of which are as follows: A discharge detection and determination system according to one aspect of the present invention for solving the above-mentioned problems is a discharge detection and determination system having a discharge detection circuit that detects discharge occurring in an electric device and a computer that determines the type of the detected discharge, wherein the discharge detection circuit has a first capacitor, first to third impedance elements, and an amplifier, one end of the first capacitor is connected to an input side of the discharge detection circuit and the other end is connected to the first impedance element, the first and third impedance elements and the amplifier form an inverting amplifier circuit, and one end of the second impedance element is connected to the amplifier to form a noise gain path. [Effects of the Invention]

[0010] According to the present invention, the device is less subject to size restrictions at the location where it is placed and is capable of accurately detecting the discharge waveforms of micro-discharges that can occur at multiple locations in the electrical equipment, thereby contributing to improving the reliability of the electrical equipment.

[0011] Problems, configurations, and effects other than those described above will become clear from the following description of the embodiments. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a diagram illustrating an example of a schematic configuration of a discharge detection and determination system. [Figure 2] FIG. 2 is a diagram showing an example of a specific configuration of impedance elements Z1 to Z3 of the discharge detection circuit. [Figure 3] FIG. 10 is a flowchart illustrating an example of a discharge detection and determination process. [Figure 4] FIG. 10 is a diagram showing an example of a display screen for notification information. [Figure 5] Fig. 5(A) shows an example of a typical conventional detection circuit. Fig. 5(B) shows the relationship between the attenuation of signal strength and frequency for each capacitor capacitance. Fig. 5(C) shows an example of accurate waveform data. Fig. 5(D) shows an example of inaccurate waveform data. [Figure 6] 10 is a diagram showing the relationship between the attenuation of signal strength and frequency when the value of impedance element Z3 is increased. [Figure 7] FIG. 2 illustrates an example of a hardware configuration of a computer. DETAILED DESCRIPTION OF THE INVENTION

[0013] The following embodiments are examples for explaining the present invention, and some omissions and simplifications have been made as appropriate for clarity of explanation. The present invention can be implemented in various other forms. Furthermore, unless otherwise specified, each component may be singular or plural.

[0014] Furthermore, in order to facilitate understanding of the invention, the position, size, shape, range, etc. of each component shown in the drawings may not represent the actual position, size, shape, range, etc. Therefore, the present invention is not necessarily limited to the position, size, shape, range, etc. disclosed in the drawings.

[0015] Furthermore, although various types of information may be described using expressions such as "tables," the various types of information may be expressed using data structures other than these. For example, various types of information such as "XX table" may be expressed as "XX information."

[0016] In addition, when there are multiple components having the same or similar functions, they may be described by using the same reference numeral with different subscripts, or when there is no need to distinguish between these multiple components, the subscripts may be omitted.

[0017] In addition, in the embodiments, there may be cases where processing performed by executing a program is described. Here, a computer executes the program using a processor (e.g., a CPU or a GPU), and performs processing defined by the program while using storage resources (e.g., memory) and interface devices (e.g., communication ports). Therefore, the processor may be the entity that executes the program and performs the processing.

[0018] Similarly, the entity that executes the program and performs the processing may be a controller, device, system, computer, or node having a processor. The entity that executes the program and performs the processing may be any computing unit, and may include a dedicated circuit that performs specific processing. Here, the dedicated circuit is, for example, an FPGA (Field Programmable Gate Array), an ASIC (Application Specific Integrated Circuit), or a CPLD (Complex Programmable Logic Device).

[0019] A program may be installed on a computer from a program source. The program source may be, for example, a program distribution server or a computer-readable storage medium. When the program source is a program distribution server, the program distribution server may include a processor and a storage resource for storing the program to be distributed, and the processor of the program distribution server may distribute the program to be distributed to other computers. In addition, in an embodiment, two or more programs may be realized as one program, or one program may be realized as two or more programs.

[0020] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0021] <Outline of the discharge detection and determination system> 1 is a diagram showing an example of the schematic configuration of an electric discharge detection and determination system. The electric discharge detection and determination system is a system that detects minute electric discharges (precursor electric discharges) occurring in a device (for example, an electrical device, hereinafter sometimes referred to as target device 100), determines the type of electric discharge (hereinafter sometimes referred to as discharge type) based on the waveform data, and notifies the user.

[0022] Specifically, the discharge detection and determination system achieves miniaturization by using a small-capacitance, small-sized capacitive element (hereinafter sometimes referred to as a capacitor) on the input side where the discharge current of the micro-discharges generated within the target device 100 flows in, and detects the micro-discharges generated within the target device 100 by placing a discharge detection circuit 200 within the target device 100 that has low input impedance and is configured to be able to accurately detect discharge waveforms in the low-frequency band.

[0023] In addition, the discharge detection and determination system determines (identifies) the type of discharge using waveform data of the micro-discharge detected by the discharge detection circuit 200, and outputs display information to a specified display device 420 to notify the user that there is an increasing possibility of a discharge occurring.

[0024] Such a discharge detection and determination system is less subject to size restrictions on where it can be installed, and is capable of accurately detecting the discharge waveforms of micro-discharges that can occur at multiple locations in electrical equipment, thereby contributing to improving the reliability of electrical equipment.

[0025] <Functional configuration of the discharge detection and judgment system> 1, the discharge detection and determination system includes a discharge detection circuit 200 installed in the target device 100 and a computer 300 connected to the output side (output terminal) of the discharge detection circuit 200. The discharge detection circuit 200 has an input side ("IN" shown in the figure) connected to an electrical path (anticipated discharge location) between a high-voltage generation target (e.g., a high-voltage board) in the target device 100 and a load (e.g., a device or electronic circuit mounted in the target device 100), and an output side ("OUT" shown in the figure) connected to the computer 300. Furthermore, when a discharge detection circuit 200 is installed in each of multiple anticipated discharge locations in the target device 100 (when multiple discharge detection circuits 200 are installed in the target device 100), the output sides (output terminals) of the multiple discharge detection circuits 200 are connected to a single computer 300. However, the connection relationship between the discharge detection circuits 200 and the computers 300 is not limited to this, and for example, the discharge detection and determination system may have a computer 300 to which each of the multiple discharge detection circuits 200 is individually connected. That is, the multiple discharge detection circuits 200 may be connected to the multiple computers 300 in a one-to-one relationship, or each group having multiple discharge detection circuits 200 may be connected to a corresponding computer 300.

[0026] <<Configuration of Discharge Detection Circuit 200>> The discharge detection circuit 200 is an electronic circuit that is installed at locations where discharge is expected in the target device 100 and detects weak currents of microdischarges that occur at each expected discharge location. The discharge detection circuit 200 also converts the detected weak currents into voltage signals and outputs them to the computer 300 as data showing the voltage waveform of the microdischarges (hereinafter sometimes referred to as waveform data).

[0027] Specifically, the discharge detection circuit 200 includes a capacitor C1, impedance elements Z1 to Z3, and an amplifier (amplifying element) AMP.

[0028] The capacitor C1 (first capacitor) is arranged on the input side into which a discharge current of a minute discharge generated in the target device 100 flows, and uses a small coupling capacitor with a small capacity of less than 10 nF (nanoFarad) (for example, 2 nF). This makes it possible to reduce the size of the discharge detection circuit 200 compared to conventional circuits that use a large-capacity, high-voltage coupling capacitor of, for example, several thousand nF.

[0029] The amplifier AMP is, for example, an electronic circuit such as an amplifier (op-amp).

[0030] As will be described later, the impedance elements Z1 to Z3 are configured by combining resistors, capacitors, inductor elements, etc. Each of the impedance elements Z1 to Z3 may be configured by a single element such as a resistor.

[0031] As shown in the figure, in the discharge detection circuit 200, one terminal of the capacitor C1 is connected to the input side of the discharge detection circuit 200, i.e., the electrical path of the location where discharge is expected, and the other terminal is connected to the impedance element Z1.

[0032] Furthermore, one terminal of the impedance element Z1 (first impedance element) is connected to the capacitor C1, and the other terminal is connected to the inverting amplification terminal (minus side) of the amplifier AMP and to the impedance elements Z2 and Z3.

[0033] Furthermore, the inverting amplification terminal (negative side) of the amplifier AMP is connected to the impedance elements Z1 to Z3, and the non-inverting amplification terminal (positive side) is connected to the ground.

[0034] Furthermore, one terminal of the impedance element Z3 (third impedance element) is connected to the output side of the amplifier AMP, and the other terminal is connected to the inverting amplification terminal (minus side) of the amplifier AMP and the impedance elements Z1 and Z2.

[0035] Furthermore, one terminal of the impedance element Z2 (second impedance element) is connected to the impedance elements Z1 and Z3 and the inverting amplification terminal (minus side) of the amplifier AMP, and the other terminal is connected to ground.

[0036] In the discharge detection circuit 200 having such a connection configuration (circuit configuration), an inverting amplification configuration (inverting amplification circuit) is formed by the impedance elements Z1 and Z3 and the amplifier AMP. Also, in the discharge detection circuit 200, a noise gain path is formed between the impedance element Z2 and the inverting amplification terminal of the amplifier AMP.

[0037] The input impedance of the discharge detection circuit 200 is a composite impedance Z of the capacitor C1 and the impedance element Z1. in = (1 / JW × C1) + Z1. The cutoff frequency on the low frequency band side of the discharge detection circuit 200 is determined by F cl = 1 / (JW × C1 × (Z1 + Z3)), where J is the imaginary number (imaginary part) and W is the angular frequency.

[0038] In this way, the input impedance of the discharge detection circuit 200 can be adjusted according to the value of the impedance element Z1. Therefore, in the discharge detection circuit 200 according to this embodiment, the input impedance is set to be low by reducing the value of the impedance element Z1. This allows a discharge current of a sufficient small discharge to flow into the discharge detection circuit 200.

[0039] Furthermore, the cutoff frequency on the low frequency band side of the discharge detection circuit 200 can be adjusted according to the value of the impedance element Z3. Therefore, in the discharge detection circuit 200 according to this embodiment, by increasing the value of the impedance element Z3, the discharge waveform of a minute discharge can be accurately detected up to the low frequency band.

[0040] That is, the discharge detection circuit 200 is configured to obtain a low input impedance and a cutoff frequency in a low frequency band by setting the value of the impedance element Z1 to a small value and the value of the impedance element Z3 to a large value.

[0041] The cutoff frequency of the discharge detection circuit 200 on the high frequency band side is F ch = 1 / Z2. Therefore, in the discharge detection circuit 200 according to this embodiment, the value of the impedance element Z2 is set so as to obtain an accurate discharge waveform of the detection target, and unnecessary high frequency components are removed.

[0042] In this way, the discharge detection circuit 200 is small and can accurately detect the discharge waveform of a weak discharge down to the low frequency band, and is configured to remove unnecessary high frequency components. The values ​​of the impedance elements Z1 to Z3 are set appropriately so that waveform data can be accurately acquired depending on the type and configuration of the target device and the type of discharge to be detected.

[0043] 2 is a diagram showing an example of a specific configuration of impedance elements Z1 to Z3 of the discharge detection circuit 200. As shown in the figure, Z1 is formed, for example, by an input resistor R1. Furthermore, Z2 is formed by connecting a capacitor C2 in parallel with a bias resistor R2. Furthermore, Z3 is formed by connecting a capacitor C3 in parallel with a feedback resistor R3.

[0044] The capacitor C3 (third capacitor) and the capacitor C2 (second capacitor) are used to adjust the values ​​of the impedance elements Z3 and Z2 that determine the components of the frequency band to be acquired.

[0045] By using such a connection configuration (circuit configuration) of each element, an inverting amplification configuration (inverting amplification circuit) is formed by the input resistor R1, the feedback resistor R3, and the amplifier AMP in the discharge detection circuit 200. Also, in the discharge detection circuit 200, a noise gain path is formed between the bias resistor R2 and the inverting amplification terminal of the amplifier AMP.

[0046] The discharge detection circuit 200 as described above accurately detects weak currents caused by minute discharges occurring at predicted discharge locations up to low frequency bands, converts them into voltage signals, and outputs the waveform data to the computer 300.

[0047] The configuration of the discharge detection circuit 200 has been described above.

[0048] <<Functional Configuration of Computer 300>> The computer 300 is a device that determines the type of discharge using waveform data, which is a voltage signal of a microdischarge detected in the target device 100, and generates information for notifying a user of a sign of discharge. As shown in FIG. 1 , the computer 300 has a signal collecting unit 310, a storage unit 320, and a processing unit 330.

[0049] The signal collecting unit 310 is a functional unit that samples and converts the waveform data acquired from the discharge detection circuit 200 into digital data. The signal collecting unit 310 is realized by, for example, a sampling board equipped with an AD (Analog-Digital) converter and an FPGA (Field Programmable Gate Array).

[0050] The signal collecting unit 310 outputs the waveform data converted into digital data to the processing unit 330 (signal acquiring unit).

[0051] The storage unit 320 is a functional unit that stores various types of information. Specifically, the storage unit 320 stores discharge type information 321 and microdischarge detection information 322.

[0052] The discharge type information 321 is information in which samples of waveform data of microdischarges corresponding to various types of discharge are registered. Specifically, the discharge type information 321 registers characteristics of waveform data (e.g., characteristics of amplitude of voltage waveform) observed in microdischarges corresponding to various types of discharge to be detected, such as corona discharge, spark discharge, and arc discharge.

[0053] The microdischarge detection information 322 is information that associates the discharge type corresponding to the microdischarge detected by the discharge detection circuit 200 with the number of times it has been detected. Specifically, the microdischarge detection information 322 registers the discharge type determined by the processing unit 330 (discharge type determination unit) based on the waveform data of the microdischarge detected by the discharge detection circuit 200 and the number of times each discharge type has been detected, in association with each other.

[0054] The processing unit 330 is a functional unit that performs various processes executed by the computer 300. Specifically, the processing unit 330 has a signal acquisition unit 331, a discharge type determination unit 332, and a display information generation unit 333 as individual functional units that perform each process.

[0055] The signal acquiring unit 331 is a functional unit that acquires the voltage signal (waveform data) of the microdischarge from the signal collecting unit 310.

[0056] The discharge type determination unit 332 is a functional unit that uses the waveform data of the microdischarge to determine (identify and specify) the discharge type of the discharge corresponding to the detected microdischarge. Specifically, the discharge type determination unit 332 determines the discharge type of the discharge corresponding to the detected microdischarge by comparing (for example, comparing) the waveform data acquired from the signal acquisition unit 331 with the waveform data of the microdischarge for each discharge type registered in the discharge type information 321.

[0057] The determination method by the discharge type determination unit 332 is not limited to the above method. For example, the discharge type may be determined based on frequency components obtained by Fourier transform or wavelet transform of waveform data. Alternatively, a determination model based on machine learning of each discharge type and the waveform data of the corresponding microdischarge may be used, and the corresponding discharge type may be determined by inputting the detected waveform data into the determination model.

[0058] Furthermore, the discharge type determination unit 332 updates the micro discharge detection information 322 in the storage unit 320 in which the discharge type determined based on the micro discharge and the number of times it has been detected are registered in association with each other.

[0059] The display information generating unit 333 is a functional unit that generates display information for notifying the user of the occurrence of discharge. Specifically, the display information generating unit 333 generates display information for notifying the user of the detection of a micro-discharge or a sign of a discharge corresponding to the detected micro-discharge, and displays the information on a predetermined display device 420 (for example, a display device 420 connected to the computer 300).

[0060] The functional configuration of the computer 300 has been described above.

[0061] <Discharge detection and judgment process> Next, the discharge detection and determination process executed by the computer 300 will be described.

[0062] 3 is a flow diagram showing an example of the discharge detection and determination process, which is started, for example, when the computer 300 is started.

[0063] When the process starts, the discharge type determination unit 332 determines whether or not waveform data of a microdischarge has been acquired (step S10). Specifically, the discharge type determination unit 332 determines whether or not waveform data of a microdischarge detected in the target device 100 has been acquired from the signal collection unit 310.

[0064] If it is determined that the waveform data has not been acquired (No in step S10), the discharge type determination unit 332 performs the process of step S10 again. On the other hand, if it is determined that the waveform data has been acquired (Yes in step S10), the discharge type determination unit 332 proceeds to step S20.

[0065] In step S20, the discharge type determination unit 332 determines the discharge type corresponding to the waveform data. Specifically, the discharge type determination unit 332 determines (specifies) the discharge type (e.g., corona discharge, spark discharge, or arc discharge) corresponding to the microdischarge detected by the discharge detection circuit 200 based on a comparison between the acquired waveform data and waveform data registered in the discharge type information 321. The discharge type determination unit 332 updates the microdischarge detection information 322 based on the determined discharge type and the number of detections.

[0066] Next, the display information generation unit 333 generates notification information for the user (step S30). Specifically, the display information generation unit 333 generates notification information including at least one of the fact that a micro-discharge, which is a sign of discharge, has been detected and the fact that the possibility of discharge occurring is increasing. Note that the notification information may include information such as the time when the micro-discharge was detected by the discharge detection circuit 200 and the number of times each determined type of discharge was detected. The display information generation unit 333 generates such notification information using the micro-discharge detection information 322.

[0067] 4 is a diagram showing an example of a display screen for notification information. As shown in the figure, the display screen 350 for notification information displays the possibility of detecting a micro-discharge corresponding to the detected discharge type and the occurrence of a discharge, the time period during which the micro-discharge was detected, and the number of times each discharge type has been detected so far.

[0068] Next, the display information generating unit 333 outputs the notification information to the display device 420 connected to the computer 300 (step S40), and the process returns to step S10.

[0069] The discharge detection and determination process has been described above.

[0070] Such a discharge detection and determination system is less subject to size restrictions on where it can be installed, and is capable of accurately detecting the discharge waveforms of micro-discharges that can occur at multiple locations in electrical equipment, thereby contributing to improving the reliability of electrical equipment.

[0071] In particular, in the discharge detection circuit 200 according to this embodiment, a small-capacity, small-sized capacitor is used as the capacitor C1 arranged on the input side of the discharge current, thereby realizing miniaturization of the circuit.

[0072] If a small, low-capacity capacitor is used for capacitor C1, the signal strength (the signal strength of the voltage signal of a minute discharge; the same applies below) will be attenuated to a large extent, making it impossible to detect low-frequency band components and therefore impossible to obtain accurate waveform data. For this reason, conventional discharge detection circuits (hereinafter sometimes referred to as conventional detection circuits) use a large, high-capacity, high-voltage capacitor for the input side capacitor to enable detection of low-frequency band components.

[0073] Fig. 5(A) shows an example of a typical conventional detection circuit. Fig. 5(B) shows the relationship between the amount of signal strength attenuation and frequency for each capacitor capacitance. Fig. 5(C) shows an example of accurate waveform data when low-frequency band components are sufficiently detected. Fig. 5(D) shows an example of inaccurate waveform data when low-frequency band components are not sufficiently detected.

[0074] As shown in Figures 5(A) to 5(D), if a small capacitance capacitor of, say, 2 nF is used, the attenuation falls below -40 dB in the low-frequency band of weak current (e.g., 100 to 1 kHz), and the signal strength is too weak to adequately detect the low-frequency band components. A voltage signal with such insufficient signal strength will result in an inaccurate waveform being detected, as shown in Figure 5(D).

[0075] On the other hand, if a large-capacity capacitor such as 2000 nF is used, the attenuation is less than -40 dB even in the low-frequency band, so the low-frequency band components can be detected sufficiently, and accurate waveform data such as that shown in Figure 5(C) can be obtained.

[0076] Therefore, in conventional detection circuits, a large-capacity, high-voltage coupling capacitor is used to accurately detect the waveform of a microdischarge. However, since a large-capacity, high-voltage capacitor is very large in size (dimensions), this leads to an increase in the size of the conventional detection circuit, and there is a problem in that it is difficult to place the capacitor at multiple expected discharge locations due to size restrictions when installing it inside the target device 100.

[0077] One conventional method for adequately detecting low-frequency band components without using a large-capacity, high-voltage coupling capacitor is to increase the value of the resistor element R (R in Figure 5A). However, this method increases the combined impedance of the capacitor and resistor element R, which in turn increases the input impedance of the conventional detection circuit. As a result, this method has the problem that a sufficient discharge current does not flow into the conventional detection circuit, making it impossible to detect a voltage signal based on an accurate current value.

[0078] In contrast, in the discharge detection circuit 200 according to this embodiment, a small-capacity capacitor is used for the capacitor C1, and the value of the impedance element Z1 is reduced to set the input impedance low, thereby allowing a sufficient weak current of a weak discharge to flow into the discharge detection circuit 200. Furthermore, in the discharge detection circuit 200 according to this embodiment, the value of the impedance element Z3 is increased, thereby enabling accurate detection of the discharge waveform of a weak discharge down to the low frequency band.

[0079] 6 is a diagram showing the relationship between the attenuation of signal strength and frequency when the value of impedance element Z3 is increased in the discharge detection circuit 200 according to this embodiment. As shown in the figure, when the value of impedance element Z3 is increased, the signal attenuation is less than −40 dB, so that sufficient signal strength can be obtained and low-frequency band components can be adequately detected.

[0080] Thus, according to the discharge detection circuit 200 of this embodiment, even if a small capacitor with a capacity of only about 2 nF is used as the input side capacitor C1, by increasing the value of the impedance element Z3, it is possible to sufficiently detect low frequency band components without increasing the capacitance of the capacitor C1, and an accurate discharge waveform can be obtained.

[0081] Furthermore, the electric discharge detection and determination system can reduce the size of the electric discharge detection circuit 200, making it less subject to size restrictions and allowing it to be placed at multiple locations where electric discharge is expected. Therefore, the electric discharge detection and determination system can contribute to improving the reliability of electrical equipment.

[0082] <Variation 1> In the first embodiment, the detectable range of the high frequency band is adjusted by providing the impedance element Z2, but there are some discharge types for which adjustment of the high frequency components is not essential (for example, discharge types for which the high frequency components do not exhibit characteristics that serve as a threshold for determination). Therefore, the discharge detection circuit 200 may be configured with elements omitting the impedance element Z2, depending on the discharge type to be detected.

[0083] A discharge detection and determination system having a discharge detection circuit 200 configured in this manner is less subject to size restrictions on the location where it is installed, and is able to accurately detect the discharge waveforms of micro-discharges that can occur at multiple locations in electrical equipment, thereby contributing to improving the reliability of electrical equipment.

[0084] <Variation 2> The electric discharge detection and determination system may also have a communication unit (communication device) and be communicably connected to an external device via a predetermined network (e.g., a communication network such as the Internet, a LAN (Local Area Network), or a WAN (Wide Area Network)). In this case, the electric discharge detection and determination system may display notification information for a user on a display device 420 (display) included in the external device (e.g., a smartphone, a tablet terminal, or a personal computer).

[0085] According to such a discharge detection and determination system, it is possible to notify the user, via an external device, that a minute discharge has been detected and that a discharge may occur.

[0086] In the above embodiment, the target device 100 and the computer 300 are described as being housed in separate housings, but the present invention is not limited to this, and the configuration of the computer 300 may be integrated with the target device 100. In other words, the configurations of the discharge detection circuit 200 and the computer 300 may be implemented in one housing (the housing of the target device 100).

[0087] <Hardware configuration of computer 300> 7 is a diagram showing an example of the hardware configuration of a computer 300. As shown in the figure, the computer 300 has an input device 410, a display device 420, a processing device 430, a main memory device 440, an auxiliary memory device 450, a communication device 460, and a bus 470 that electrically interconnects these devices.

[0088] The input device 410 is, for example, an input device such as a touch panel, a keyboard, a mouse, etc. The display device 420 is a display device such as a liquid crystal display or an organic display.

[0089] The processing device 430 is, for example, a processor such as a CPU (Central Processing Unit) or a GPU (Graphics Processing Unit). The main storage device 440 is a memory device (memory resource) such as a RAM (Random Access Memory) or a ROM (Read Only Memory). The computer 300 has at least one processor and memory resource.

[0090] The auxiliary storage device 450 is a non-volatile storage device capable of storing digital information, such as a so-called hard disk drive, a solid state drive (SSD), or a flash memory.

[0091] The communication device 460 is a wired communication device that performs wired communication via a network cable, or a wireless communication device that performs wireless communication via an antenna.

[0092] An example of the hardware configuration of the computer 300 has been described above.

[0093] The processing unit 330 of the computer 300 is realized by a program that causes the processing device 430 to perform processing. This program is stored in the main memory device 440 or the auxiliary memory device 450, and is loaded onto the main memory device 440 and executed by the processing device 430 when the program is executed.

[0094] The storage unit 320 is realized by a main storage device 440, an auxiliary storage device 450, or a combination thereof. The communication unit (not shown) is realized by a communication device 460.

[0095] Furthermore, the above-described configurations, functions, processing units, and processing means of the computer 300 may be partially or entirely implemented in hardware, for example, by designing them as integrated circuits. The above-described configurations and functions may also be implemented in software, with a processor interpreting and executing programs that implement the respective functions. Information such as programs, tables, and files that implement the respective functions may be stored in storage devices such as memory, hard disks, and SSDs, or in recording media such as IC cards, SD cards, and DVDs.

[0096] Furthermore, the present invention is not limited to the above-described embodiments and modifications, and includes various modifications within the scope of the same technical concept. For example, the above-described embodiments have been described in detail to clearly explain the present invention, and the present invention is not necessarily limited to those including all of the described configurations. Furthermore, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, or to add the configuration of another embodiment to the configuration of one embodiment. Furthermore, it is possible to add, delete, or replace part of the configuration of each embodiment with other configurations.

[0097] In addition, in the above explanation, the control lines and information lines are those that are considered necessary for the explanation, and do not necessarily show all the control lines and information lines in the product. In reality, it can be considered that almost all components are interconnected. [Explanation of symbols]

[0098] 100 Target device, 200 Discharge detection circuit, 300 Computer, 310 Signal collection unit, 320 Memory unit, 321 Discharge type information, 322 Microdischarge detection information, 330 Processing unit, 331 Signal acquisition unit, 332 Discharge type determination unit, 333 Display information generation unit, 410 Input device, 420 Display device, 430 Processing unit, 440 Main memory device, 450 Auxiliary memory device, 460 Communication device, 470 Bus

Claims

1. A discharge detection and determination system having a discharge detection circuit that detects discharge occurring in an electrical device and a computer that determines the type of the detected discharge, the discharge detection circuit includes a first capacitor, first to third impedance elements, and an amplifier; one end of the first capacitor is connected to the input side of the discharge detection circuit, and the other end is connected to the first impedance element; the first and third impedance elements and the amplifier form an inverting amplifier circuit; One end of the second impedance element is connected to the amplifier to form a noise gain path. A discharge detection and determination system characterized by:

2. The discharge detection and determination system according to claim 1, In the discharge detection circuit, one end of the first capacitor is connected to the input side, and the other end is connected to the first impedance element; one end of the first impedance element is connected to the first capacitor, and the other end is connected to the second and third impedance elements and the amplifier; one end of the second impedance element is connected to the first and third impedance elements and the amplifier, and the other end is connected to ground; one end of the third impedance element is connected to the first and second impedance elements and the amplifier, and the other end is connected to the output side of the amplifier; One end of the amplifier is connected to the first to third impedance elements, and the other end is connected to ground. A discharge detection and determination system characterized by:

3. The discharge detection and determination system according to claim 1, the second impedance element has a configuration in which any one of a second capacitor, a resistor, and an inductor element is combined and connected in parallel, The third impedance element has a configuration in which any one of a third capacitor, a resistor, and an inductor element is combined and connected in parallel. A discharge detection and determination system characterized by:

4. The discharge detection and determination system according to claim 1, The discharge detection circuit The second impedance element is omitted, and the first and third impedance elements and the amplifier are connected in the above-described manner. A discharge detection and determination system characterized by:

5. The discharge detection and determination system according to claim 1, The first capacitor is a small-capacitance coupling capacitor of less than 10 nF (nanoFarad). A discharge detection and determination system characterized by:

6. The discharge detection and determination system according to claim 1, The computer The type of the detected discharge is determined using discharge type information in which characteristics corresponding to various types of discharge are registered and waveform data indicating the voltage signal of the discharge detected by the discharge detection circuit. A discharge detection and determination system characterized by:

7. The discharge detection and determination system according to claim 6, The computer Generate notification information regarding the occurrence of discharge together with the determined type of discharge and output it to a predetermined display device. A discharge detection and determination system characterized by:

8. A discharge detection circuit that detects a discharge occurring in an electronic device, a first capacitor, first to third impedance elements, and an amplifier; one end of the first capacitor is connected to the input side, and the other end is connected to the first impedance element; the first and third impedance elements and the amplifier form an inverting amplifier circuit; One end of the second impedance element is connected to the amplifier to form a noise gain path. A discharge detection circuit comprising:

9. 9. The discharge detection circuit according to claim 8, one end of the first capacitor is connected to the input side, and the other end is connected to the first impedance element; one end of the first impedance element is connected to the first capacitor, and the other end is connected to the second and third impedance elements and the amplifier; one end of the second impedance element is connected to the first and third impedance elements and the amplifier, and the other end is connected to ground; one end of the third impedance element is connected to the first and second impedance elements and the amplifier, and the other end is connected to the output side of the amplifier; One end of the amplifier is connected to the first to third impedance elements, and the other end is connected to ground. A discharge detection circuit comprising:

10. 9. The discharge detection circuit according to claim 8, the second impedance element has a configuration in which any one of a second capacitor, a resistor, and an inductor element is combined and connected in parallel, The third impedance element has a configuration in which any one of a third capacitor, a resistor, and an inductor element is combined and connected in parallel. A discharge detection circuit comprising:

11. 9. The discharge detection circuit according to claim 8, The second impedance element is omitted, and the first and third impedance elements and the amplifier are connected in the above-described manner. A discharge detection circuit comprising:

12. 9. The discharge detection circuit according to claim 8, The first capacitor is a small-capacitance coupling capacitor of less than 10 nF (nanoFarad). A discharge detection circuit comprising:

13. A discharge detection and determination method performed by a discharge detection and determination system having a discharge detection circuit that detects discharge occurring in an electrical device, the discharge detection circuit includes a first capacitor, first to third impedance elements, and an amplifier, one end of the first capacitor is connected to an input side and the other end is connected to the first impedance element, the first and third impedance elements and the amplifier form an inverting amplifier circuit, and one end of the second impedance element is connected to the amplifier to form a noise gain path; The discharge detection and determination system performs a step of determining the type of the detected discharge based on waveform data indicating a voltage signal of the discharge detected by the discharge detection circuit. A discharge detection and determination method comprising:

14. The discharge detection and determination method according to claim 13, In the discharge detection circuit, one end of the first capacitor is connected to the input side, and the other end is connected to the first impedance element; one end of the first impedance element is connected to the first capacitor, and the other end is connected to the second and third impedance elements and the amplifier; one end of the second impedance element is connected to the first and third impedance elements and the amplifier, and the other end is connected to ground; one end of the third impedance element is connected to the first and second impedance elements and the amplifier, and the other end is connected to the output side of the amplifier; One end of the amplifier is connected to the first to third impedance elements, and the other end is connected to ground. A discharge detection and determination method comprising:

15. The discharge detection and determination method according to claim 13, The first capacitor is a small-capacitance coupling capacitor of less than 10 nF (nanoFarad). A discharge detection and determination method comprising:

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