Partial discharge detection device and system

Abstract

The utility model relates to a partial discharge detection device and system.The partial discharge detection device comprises at least one sensor and a monitoring host, the monitoring host comprises a processor, a wireless transmission module, a wired transmission module and a signal conditioning circuit, and the signal conditioning circuit comprises at least one data acquisition port; each data acquisition port corresponds to one sensor, the signal conditioning circuit is connected with the processor, the processor is connected with the wireless transmission module and the wired transmission module, and at least one sensor is connected to the signal conditioning circuit through the data acquisition ports; the at least one sensor is used for collecting at least one partial discharge signal and transmitting the partial discharge signal to the processor through the signal conditioning circuit; the processor is used for sending the partial discharge signal to the data processing equipment through the wireless transmission module or the wired transmission module, so that the data processing equipment analyzes the partial discharge signal to obtain a partial discharge detection result, and the detection precision and the equipment reliability can be improved.

Description

Technical Field

[0001] The present disclosure relates to the field of power system monitoring and partial discharge detection, and in particular, to a partial discharge detection device and system. Background Art

[0002] Currently, in new energy power stations, due to the partial discharge of power equipment, it may cause damage to power equipment, affecting the reliability and operation safety of the system. The partial discharge problem of power equipment in new energy power stations has gradually attracted attention. Partial discharge is also an early indication of the insulation deterioration of power equipment and is an effective fault warning information.

[0003] In the prior art, the main partial discharge detection methods include the ultrasonic method, the ultra-high frequency signal detection method, and the earth current wave detection method. And the current partial discharge detection only supports a single transmission protocol. Once the transmission device fails, the detection work cannot be used normally. Due to the harsh environment where the partial discharge phenomenon occurs, various complex electromagnetic interferences will have an adverse impact on the measurement of a single sensor. Therefore, the inaccurate measurement results of the partial discharge detection device with a single sensor are problems that need to be solved urgently at present. Summary of the Utility Model

[0004] To overcome the problems existing in the related art, the present disclosure provides a partial discharge detection device and system.

[0005] According to the first aspect of the embodiments of the present disclosure, a partial discharge detection device is provided, including: at least one sensor and a monitoring host. The monitoring host includes a processor, a wireless transmission module, a wired transmission module, and a signal conditioning circuit. The signal conditioning circuit includes at least one data acquisition port, and each data acquisition port corresponds to one of the sensors. The signal conditioning circuit is connected to the processor, the processor is connected to the wireless transmission module and the wired transmission module, and the at least one sensor accesses the signal conditioning circuit through the data acquisition port;

[0006] The at least one sensor is configured to collect at least one partial discharge signal and transmit the partial discharge signal to the processor through the signal conditioning circuit;

[0007] The processor is configured to send the partial discharge signal to a data processing device through the wireless transmission module or the wired transmission module, so that the data processing device analyzes the partial discharge signal to obtain a partial discharge detection result.

[0008] Optionally, an A / D conversion module is built in the processor. The A / D conversion module is configured to convert the partial discharge signal received by the processor from an analog signal to a digital signal and send it to the data processing device.

[0009] Optionally, the at least one sensor includes one or more of a spatial electromagnetic field sensor, a high-frequency capacitive coupling sensor, and an ultrasonic sensor, and the partial discharge signal includes one or more of a transient earth voltage, a high-frequency current, and an ultrasonic signal.

[0010] Optionally, the wireless transmission module includes a WiFi module, and the wired transmission module includes an RS485 module and / or an RJ45 local area network module.

[0011] Optionally, the processor is configured to determine the data type of the partial discharge signal and the data transmission method corresponding to the data type. The data type includes one or more of a transient earth voltage, a high-frequency current, and an ultrasonic signal, and the corresponding data transmission method is transmission through the WiFi module, transmission through the RS485 module, or transmission through the RJ45 local area network module.

[0012] Optionally, the partial discharge detection result includes the fault information of the circuit and the PRPD spectrogram of the partial discharge signal.

[0013] Optionally, the partial discharge detection device further includes a metal housing, and the partial discharge detection device is disposed in the inner cavity of the housing.

[0014] According to a second aspect of the embodiments of the present disclosure, there is provided a partial discharge detection system, including the partial discharge detection device according to the first aspect of the embodiments of the present disclosure and a data processing device. The partial discharge detection device is connected to the data processing device through a wireless transmission module or a wired transmission module.

[0015] Optionally, the data processing device includes a signal processing module and an image analysis module;

[0016] The signal processing module is configured to determine the fault level of the circuit according to the partial discharge signal and a preset signal threshold, and the fault level is one of dangerous, abnormal, and normal;

[0017] The image analysis module is configured to determine the PRPD spectrogram of the partial discharge signal according to the partial discharge signal.

[0018] Optionally, the system further includes a display device connected to the data processing device;

[0019] The display device is configured to obtain the PRPD spectrogram and the fault level output by the data processing device, and display the PRPD spectrogram and the fault level.

[0020] Optionally, the data processing device includes a personal computer, an industrial computer, or a central server.

[0021] In the above technical solution, the at least one sensor is configured to collect at least one type of partial discharge signal and transmit the partial discharge signal to the processor; the processor is configured to send the partial discharge signal to a data processing device through the wireless transmission module or the wired transmission module, so that the data processing device analyzes the partial discharge signal to obtain a partial discharge detection result. Through the above technical solution, at least one sensor is provided in the partial discharge detection device, which can detect different partial discharge signals through different sensors, improving the accuracy of partial discharge detection. Moreover, the partial discharge detection device supports wireless transmission and wired transmission, and supports multiple transmission protocols, and can quickly switch between various transmission protocols, improving the reliability of the partial discharge detection device.

[0022] Other features and advantages of the present disclosure will be described in detail in the following detailed implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. They are used together with the following detailed implementation to explain the present disclosure, but do not constitute a limitation to the present disclosure. In the drawings:

[0024] Figure 1 is a structural diagram of a partial discharge detection device shown according to an exemplary embodiment.

[0025] Figure 2 is a structural diagram of another partial discharge detection device shown according to an exemplary embodiment.

[0026] Figure 3 is a structural diagram of a partial discharge detection system shown according to an exemplary embodiment.

[0027] Figure 4 is a structural diagram of another partial discharge detection system shown according to an exemplary embodiment.

[0028] Figure 5 is a structural diagram of yet another partial discharge detection system shown according to an exemplary embodiment.

[0029] Figure 6 is a schematic diagram of a partial discharge detection system shown according to an exemplary embodiment.

[0030] Figure 7 is a display diagram of a partial discharge detection system shown according to an exemplary embodiment. DETAILED IMPLEMENTATION

[0031] Exemplary embodiments will be described in detail herein, and examples thereof are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0032] It can be understood that although operations are described in a specific order in the drawings in the embodiments of the present disclosure, it should not be construed as requiring these operations to be performed in the specific order shown or in a serial order, or requiring all the operations shown to obtain the desired result. In certain environments, multitasking and parallel processing may be advantageous.

[0033] It should be noted that all actions of obtaining signals, information, or data in the present disclosure are carried out on the premise of complying with the corresponding data protection regulations and policies of the country where the location is located and with the authorization given by the owner of the corresponding device.

[0034] Figure 1 is a structural diagram of a partial discharge detection device shown according to an exemplary embodiment, as Figure 1 shown, the partial discharge detection device 100 includes: at least one sensor 101 and a monitoring host 102, the monitoring host 102 includes a processor 1021, a wireless transmission module 1022, a wired transmission module 1023, and a signal conditioning circuit 1024, the signal conditioning circuit 1024 includes at least one data acquisition port 1024a, each such data acquisition port 1024a corresponds to one such sensor 101, the signal conditioning circuit 1024 is connected to the processor 1021, the processor 1021 is connected to the wireless transmission module 1022 and the wired transmission module 1023, and the at least one sensor 101 accesses the signal conditioning circuit 1024 through the data acquisition port 1024a;

[0035] The at least one sensor 101 is configured to collect at least one type of partial discharge signal and transmit the partial discharge signal through the signal conditioning circuit 1024 to the processor 1021;

[0036] The processor 1021 is configured to send the partial discharge signal to a data processing device through the wireless transmission module 1022 or the wired transmission module 1023, so that the data processing device analyzes the partial discharge signal to obtain a partial discharge detection result.

[0037] Exemplarily, in the partial discharge detection device 100, one or more sensors 101 are included. The sensor 101 is one or more of a spatial electromagnetic field sensor, a high-frequency capacitive coupling sensor, and an ultrasonic sensor. The sensor 101 is connected to the cable to be measured in the new energy station. The sensor 101 collects the partial discharge signal corresponding to the sensor 101 at the cable to be measured, and transmits the partial discharge signal to the processor 1021 through the signal conditioning circuit 1024. The processor 1021 sends the partial discharge signal to the data processing device through the wireless transmission module 1022 or the wired transmission module 1023, so that the data processing device analyzes the partial discharge signal to obtain a partial discharge detection result. The partial discharge detection result includes the type of partial discharge, the degree of danger of the partial discharge, and the prompt alarm information of the degree of danger of the partial discharge. By using different sensors to detect different partial discharge signals, the accuracy of partial discharge detection is improved, and multiple transmission protocols are supported, and it can quickly switch between various transmission protocols, improving the reliability of the partial discharge detection device. Alarm prompts are given for the partial discharge type and the degree of danger of the partial discharge, enabling the staff to timely discover the faults of power equipment in the new energy station.

[0038] Optionally, the at least one sensor 101 includes one or more of a spatial electromagnetic field sensor, a high-frequency capacitive coupling sensor, and an ultrasonic sensor. The partial discharge signal includes one or more of transient earth voltage, high-frequency current, and ultrasonic signal.

[0039] Exemplarily, the sensor 101 of the partial discharge detection device 100 can be one or more of a spatial electromagnetic field sensor, a high-frequency capacitive coupling sensor, and an ultrasonic sensor. According to the detection requirements in the new energy station, the sensor 101 of the partial discharge detection device 100 is connected to the cable to be measured in the new energy station to detect the partial discharge signal of the cable to be measured. The partial discharge signal includes one or more of transient earth voltage, high-frequency current, and ultrasonic signal. For example, the spatial electromagnetic field sensor collects the transient earth voltage signal, the high-frequency capacitive coupling sensor collects the high-frequency current signal, and the ultrasonic sensor collects the ultrasonic signal, etc.

[0040] Optionally, the wireless transmission module 1022 includes a WiFi module, and the wired transmission module 1023 includes an RS485 module and / or an RJ45 local area network module.

[0041] Exemplarily, the wireless transmission module 1022 includes a WiFi module, which transmits the processed partial discharge signal to the WiFi interface of the data processing device through a wireless antenna. The wired transmission module 1023 includes an RS485 module and / or an RJ45 local area network module. The RS485 module is wiredly connected to the data processing device through an RS485 interface and transmits the processed partial discharge signal to the data processing device. The RJ45 local area network module transmits the processed partial discharge signal to the data processing device through a wired connection, enabling support for multiple transmission protocols and rapid switching between various transmission protocols, thereby improving the reliability of the partial discharge detection device.

[0042] Optionally, the processor 1021 is configured to determine the data type of the partial discharge signal and the corresponding data transmission method. The data type includes one or more of transient earth voltage, high-frequency current, and ultrasonic signal, and the corresponding data transmission method is transmission through the WiFi module, transmission through the RS485 module, or transmission through the RJ45 local area network module.

[0043] Exemplarily, the processor 1021 in the partial discharge detection device determines the data type of the partial discharge signal and the corresponding data transmission method. The data type includes one or more of transient earth voltage, high-frequency current, and ultrasonic signal, and the corresponding data transmission method is transmission through the WiFi module, transmission through the RS485 module, or transmission through the RJ45 local area network module.

[0044] Optionally, the partial discharge detection device 100 further includes a metal housing, and the partial discharge detection device 100 is placed in the inner cavity of the housing.

[0045] Exemplarily, the material of the metal housing of the partial discharge detection device 100 includes one or more of galvanized steel, aluminum alloy, stainless steel, and titanium alloy, and the partial discharge detection device 100 is placed in the inner cavity of the metal housing.

[0046] Through the above technical solution, at least one sensor is provided in the partial discharge detection device, which can detect different partial discharge signals through different sensors, improving the accuracy of partial discharge detection. Moreover, the partial discharge detection device supports wireless transmission and wired transmission, and supports multiple transmission protocols, enabling rapid switching between various transmission protocols, thereby improving the reliability of the partial discharge detection device.

[0047] Figure 2 is a structural diagram of another partial discharge detection device shown according to an exemplary embodiment, as Figure 2As shown, the processor 1021 is built-in with an A / D conversion module 10211. The A / D conversion module 10211 is used to convert the partial discharge signal received by the processor 1021 from an analog signal to a digital signal and send it to the data processing device.

[0048] Exemplarily, after the processor 1021 receives the partial discharge signal, the A / D conversion module 10211 converts the partial discharge signal from an analog signal to a digital signal, and the digital signal of the partial discharge signal is sent to the data processing device through the wireless transmission module 1022 or the wired transmission module 1023, so that the data processing device analyzes the partial discharge signal to obtain a partial discharge detection result.

[0049] Figure 3 is a structural diagram of a partial discharge detection system shown according to an exemplary embodiment, as Figure 3 As shown, the partial discharge detection system 200 includes: a partial discharge detection device 100 and a data processing device 210. The partial discharge detection device 100 is connected to the data processing device 210 through a wireless transmission module 1022 or a wired transmission module 1023.

[0050] Exemplarily, in the partial discharge detection system 200, the partial discharge signal at the cable to be measured in the new energy station is acquired through the partial discharge detection device 100 and the data processing device 210, and the acquired partial discharge signal is processed. The partial discharge detection device 100 is connected to the data processing device 210 through a wireless transmission module 1022 or a wired transmission module 1023. The wireless transmission module 1022 includes a WiFi module. The WiFi module transmits the processed partial discharge signal to the WiFi interface of the data processing device through a wireless antenna. For example, when the data processing device is an industrial computer, the industrial computer turns on the wireless device to search for WiFi signals, fills in the IP address of the wireless transmission module 1022 on the corresponding monitoring host 102 on the software interface of the industrial computer and then connects. Filling in the wrong IP address cannot receive partial discharge data. After connecting, the corresponding partial discharge data is received and processed; the wired transmission module 1023 includes an RS485 module and / or an RJ45 local area network module. The RS485 module is wired-connected to the data processing device through an RS485 interface and transmits the processed partial discharge signal to the data processing device. The RJ45 local area network module transmits the processed partial discharge signal to the data processing device through a wired connection transmission method, which can support multiple transmission protocols and quickly switch between various transmission protocols, improving the reliability of the partial discharge detection device.

[0051] Figure 4is a structural diagram of another partial discharge detection system shown according to an exemplary embodiment, as Figure 4 shown, the data processing device 210 includes: a signal processing module 211 and an image analysis module 212;

[0052] The signal processing module 211 is configured to determine a fault level of the circuit according to the partial discharge signal and a preset signal threshold, and the fault level is one of dangerous, abnormal, and normal;

[0053] The image analysis module 212 is configured to determine a PRPD spectrogram of the partial discharge signal according to the partial discharge signal.

[0054] Exemplarily, in the data processing device 210, the signal processing module 211 determines a fault level of the circuit according to the partial discharge signal and a preset signal threshold, and the fault level is one of dangerous, abnormal, and normal; the image analysis module 212 determines a PRPD spectrogram of the partial discharge signal according to the partial discharge signal, and the PRPD spectrogram includes one or more of the PRPD spectrograms of the ultrasonic discharge amplitude, the high-frequency discharge amplitude, and the spatial magnetic discharge amplitude.

[0055] Figure 5 is a structural diagram of yet another partial discharge detection system shown according to an exemplary embodiment, as Figure 5 shown, the partial discharge detection system 200 further includes: a display device 220, connected to the data processing device 210;

[0056] The display device 220 is configured to obtain the PRPD spectrogram and the fault level output by the data processing device 210, and display the PRPD spectrogram and the fault level.

[0057] Exemplarily, the display device includes one or more of a display screen of the data processing device 210 or a separate display, and the display device 220 obtains the PRPD spectrogram and the fault level output by the data processing device 210, and displays the PRPD spectrogram and the fault level.

[0058] Optionally, the data processing device 210 includes: a personal computer, an industrial computer, or a central server.

[0059] Figure 6 is a schematic diagram of a partial discharge detection system shown according to an exemplary embodiment, as Figure 6As shown in the figure, the partial discharge detection system 600 includes: a partial discharge detection device 601 and an industrial computer 602; the partial discharge detection device 601 includes: a plurality of sensors 6011 and a distributed monitoring host 6012; the plurality of sensors 6011 includes: a spatial electromagnetic field sensor 60111, a high-frequency capacitive coupling sensor 60112, and an ultrasonic sensor 60113; the distributed monitoring host 6012 includes: a CPU module 60121, a wireless transmission module 60122, a wireless antenna 60122a, an RS485 module 60123, an RJ45 local area network module 60124, a signal conditioning circuit 60125. The RS485 module 60123 is the RS485 interface on the CPU module 60121. In the partial discharge detection system 600, turn on the industrial computer 602, run the cable insulation live detection and diagnosis system software in the industrial computer 602, configure the parameters of the sensors 6011, connect the sensors 6011 to the cable to be tested in the new energy power station, turn on the distributed monitoring host 6012, select a transmission method, connect the industrial computer 602 and the distributed monitoring host 6012 according to this transmission method, and the startup logo of the detection and diagnosis system software. After normal communication, the measurement logo changes from gray to black. Click on the measurement logo, and the data analysis result will be displayed on the monitor of the industrial computer 602.

[0060] Among them, the space electromagnetic field sensor 60111, the high-frequency capacitive coupling sensor 60112, and the ultrasonic sensor 60113 in the sensor 6011 installed at the cable to be measured in the new energy power station are respectively connected to the ports of three signal conditioning circuits of the distributed monitoring host 6012. The data of the partial discharge signal obtained is converted into a digital signal of the partial discharge signal that can be received by the CPU module 60121 through the signal conditioning circuit. The three digital signals are connected to the corresponding pins of the CPU module 60121, and the data of the collected partial discharge signal is transmitted to the CPU module 60121. The CPU module 60121 completes further data processing. The CPU module 60121 transmits the processed signal to the industrial computer 602 in three ways: RJ45 local area network, RS485, and WiFi according to the corresponding transmission protocol. The WiFi transmission method is that the CPU module 60121 transmits the partial discharge signal to the wireless transmission module 60122, and the wireless transmission module 60122 then transmits the partial discharge signal to the space within a certain range around through the wireless antenna 60122a. The RS485 method realizes the wired data transmission between the CPU module 60121 and the industrial computer 602 through the RS485 interface. The RJ45 local area network module can realize the wired network connection between the CPU module 60121 and the industrial computer 602. The industrial computer 602 realizes the communication between the distributed monitoring host 6012 and the industrial computer 602 through its own interface, and transmits the data of the partial discharge signal to the industrial computer 602. Finally, the industrial computer 602 analyzes, processes, and displays the partial discharge detection result, realizes the acquisition, transmission, detection, and processing of the partial discharge data, and finally displays prompt alarm information such as the type of partial discharge and the degree of danger of the partial discharge on the industrial computer, so as to realize the defect detection of the cable.

[0061] Figure 7 is a display diagram of a partial discharge detection system shown according to an exemplary embodiment, as Figure 7 shown, showing an interface schematic diagram of an ICW power cable insulation defect live detection and diagnosis system. In this interface, the above-mentioned partial discharge detection result can include the fault information of the circuit and the PRPD spectrogram of the partial discharge signal. The partial discharge detection result includes the fault information of the circuit at the cable to be detected in the new energy power station, such as the type of partial discharge, the degree of danger of the partial discharge, the prompt alarm information of the degree of danger of the partial discharge, and the PRPD spectrogram of the partial discharge signal generated after analyzing the partial discharge signal. The degree of danger of the partial discharge includes one of danger, abnormality, and normal. The PRPD spectrogram includes one or more of the PRPD spectrograms of the ultrasonic discharge amplitude, the high-frequency discharge amplitude, and the space magnetic discharge amplitude.

[0062] For example: Figure 7The degree of risk of the partial discharge shown at the diagnosis result of the comprehensive diagnosis result on the left side, where the degree of risk of the partial discharge includes one of dangerous, abnormal, and normal. After the partial discharge detection in the detection area is completed, one of dangerous, abnormal, and normal at the diagnosis result is indicated by lighting, showing the degree of risk of the partial discharge. The dangerous, abnormal, and normal are displayed by lights of different colors. For example, when the detection result is dangerous, a red light is displayed; when the detection result is abnormal, a yellow light is displayed; when the detection result is normal, a green light is displayed. Different light colors are used to prompt alarm information about the degree of risk of the partial discharge. The defect location and defect type at the comprehensive diagnosis result show the type of the partial discharge and the fault location of the partial discharge. The comprehensive diagnosis result area can also display configuration parameter information. Figure 7 The PRPD spectrogram of the partial discharge signal is displayed in the middle, and the PRPD spectrogram includes one or more of the PRPD spectrograms of the ultrasonic discharge amplitude, high-frequency discharge amplitude, and spatial magnetic discharge amplitude. Figure 7 Statistics data and control buttons are displayed on the right side. The statistics data area displays the data of the partial discharge signal. The control button area includes a shutdown button and a measurement button to control the shutdown or measurement of the partial discharge detection device. The control button area can also display the device IP information.

[0063] Through the above technical solution, at least one sensor is provided in the partial discharge detection device, which can detect different partial discharge signals through different sensors, improving the accuracy of partial discharge detection. And the partial discharge detection device supports wireless transmission and wired transmission, and supports multiple transmission protocols, and can quickly switch between various transmission protocols, improving the reliability of the partial discharge detection device.

[0064] The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0065] In addition, it should be noted that, among the various specific technical features described in the above specific embodiments, they can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present disclosure does not separately describe various possible combination methods.

[0066] In addition, any combination can be made between different embodiments of the present disclosure, as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content disclosed by the present disclosure.

Claims

1. A partial discharge detection device, characterized in that: include: At least one sensor and a monitoring host, the monitoring host includes a processor, a wireless transmission module, a wired transmission module and a signal conditioning circuit, the signal conditioning circuit includes at least one data acquisition port, each of the data acquisition ports corresponds to one of the sensors, the signal conditioning circuit is connected to the processor, the processor is connected to the wireless transmission module and the wired transmission module, and the at least one sensor is connected to the signal conditioning circuit through the data acquisition port; The at least one sensor is used to collect at least one partial discharge signal and transmit the partial discharge signal to the processor through the signal conditioning circuit; The processor is used to send the partial discharge signal to a data processing device through the wireless transmission module or the wired transmission module, so that the data processing device analyzes the partial discharge signal to obtain a partial discharge detection result.

2. The partial discharge detection device according to claim 1, characterized in that: The processor has a built-in A / D conversion module, and the A / D conversion module is used to convert the partial discharge signal received by the processor from an analog signal into a digital signal, and send the digital signal to the data processing device.

3. The partial discharge detection device according to claim 1, characterized in that: The at least one sensor includes: one or more of a space electromagnetic field sensor, a high-frequency capacitive coupling sensor and an ultrasonic sensor; the partial discharge signal includes: one or more of a transient voltage to ground, a high-frequency current and an ultrasonic signal.

4. The partial discharge detection device according to claim 1, characterized in that: The wireless transmission module includes a WiFi module, and the wired transmission module includes an RS485 module and / or an RJ45 local area network module.

5. The partial discharge detection device according to claim 4, characterized in that: The processor is used to determine a data type of the partial discharge signal and a data transmission mode corresponding to the data type, wherein the data type includes one or more of a transient voltage to ground, a high-frequency current and an ultrasonic signal, and the corresponding data transmission mode is transmission through a WiFi module, transmission through an RS485 module or transmission through an RJ45 local area network module.

6. The partial discharge detection device according to any one of claims 1 to 5, characterized in that: The partial discharge detection result includes circuit fault information and a PRPD spectrum of the partial discharge signal.

7. The partial discharge detection device according to any one of claims 1 to 5, characterized in that: The partial discharge detection device further comprises a metal shell, and the partial discharge detection device is placed in an inner cavity of the shell.

8. A partial discharge detection system, characterized in that: It comprises the partial discharge detection device and data processing equipment as described in any one of claims 1 to 7, wherein the partial discharge detection device is connected to the data processing equipment via a wireless transmission module or a wired transmission module.

9. The system according to claim 8, characterized in that The data processing device comprises: a signal processing module and an image analysis module; The signal processing module is used to determine the fault level of the circuit according to the partial discharge signal and the preset signal threshold, and the fault level is one of dangerous, abnormal and normal; The image analysis module is used to determine a PRPD spectrum of the local discharge signal according to the local discharge signal.

10. The system according to claim 9, characterized in that The system further comprises: a display device connected to the data processing device; The display device is used to obtain the PRPD spectrum and the fault level output by the data processing equipment, and display the PRPD spectrum and the fault level.

11. The system according to any one of claims 8 to 10, characterized in that: The data processing equipment includes: a personal computer, an industrial computer or a central server.

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