Power grid partial discharge monitoring equipment based on gas detection

Abstract

The present invention relates to the field of partial discharge monitoring technology, and in particular to a partial discharge monitoring device for a power grid based on gas detection, comprising a power supply, a plurality of monitoring devices, an alarm and a remote host, wherein the monitoring devices are equidistantly installed on a cable, and a gas sensor is connected to the gas sensor, signal amplifier, A / D conversion module and microprocessor of the monitoring device in sequence, and the microprocessor is connected to the alarm and the remote host through a network; the gas sensor detects the gas generated by the high temperature of rubber parts due to partial discharge; the signal amplifier amplifies the detection signal, and transmits the amplified signal to the A / D conversion module after filtering; the A / D conversion module feeds the electrical signal converted from the detection signal into the microprocessor; the microprocessor calculates the received electrical signal to obtain the gas concentration, and obtains the judgment result of partial discharge accordingly. This scheme can detect the initial partial discharge and the partial discharge of the closed switch, and improve the accuracy of partial discharge detection.

Description

Technical Field

[0001] The invention relates to the technical field of partial discharge monitoring, and in particular to a power grid partial discharge monitoring device based on gas detection. Background Art

[0002] The power facilities in the power grid include high-voltage circuit breakers or switches, high-voltage buses, high-voltage cable joints, low-voltage high-current switches, low-voltage buses and transformers, etc. These facilities are generally insulated by insulating layers such as insulating paint, air, etc., so that the current can flow completely through the set path without leakage when the load is fixed or changing. At this time, no partial discharge occurs. If the insulation deteriorates and the contact is incomplete, the current cannot flow completely through the set path when the load is fixed or changing, and leakage occurs to generate arcs, which is the so-called partial discharge, or PD for short. The arc generated by partial discharge will cause the temperature of the power facilities to rise abnormally and generate ultrasonic waves, thereby shortening the life of the power facilities in the power grid and even causing failure of the power facilities in the power grid.

[0003] Although partial discharge is short and has little energy, it is very harmful. The long-term existence of partial discharge will have a great destructive effect on the insulation material. First, the insulation material adjacent to the partial discharge is directly bombarded by the discharge particles, causing local insulation damage. Second, the chemical action of active gases such as heat, ozone, and nitrogen oxides generated by the discharge causes local insulation to be corroded and aged, and the conductivity increases, eventually leading to thermal breakdown. For example, the aging and damage of the internal insulation of a transformer in operation often starts from partial discharge.

[0004] Existing partial discharge monitoring solutions generally use ultrasonic monitoring to monitor the sound waves appearing in partial discharge, and convert the monitored sound waves appearing in partial discharge into electrical signals, which are recorded on tape for analysis. The difference in transmission time between the electrical signal and the acoustic signal can be used to obtain the distance from the detection point to the partial discharge point. This is different from using sound amplification and using decibel values ​​to distinguish partial discharge. In the early stages of partial discharge and partial discharge of closed switches may not be monitored, affecting the accuracy of detection.

[0005] Therefore, it is necessary to provide a power grid partial discharge monitoring device based on gas detection to solve the above technical problems. Summary of the invention

[0006] In view of this, and in response to the above shortcomings, the present invention provides a power grid partial discharge monitoring device based on gas detection, which can detect initial partial discharge and partial discharge of closed switches to improve the accuracy of partial discharge detection.

[0007] A power grid partial discharge monitoring device based on gas detection, comprising: a power supply, a plurality of monitoring devices, an alarm and a remote host, wherein the monitoring devices are equidistantly installed on a cable, the monitoring devices comprise a gas sensor, a signal amplifier, an A / D conversion module and a microprocessor, the gas sensor is sequentially connected to the signal amplifier, the A / D conversion module and the microprocessor, and the microprocessor is connected to the alarm and the remote host via a network;

[0008] The gas sensor is used to detect the gas generated by the rubber parts being subjected to high temperature due to partial discharge in the power facilities, and output a detection signal to the outside;

[0009] The signal amplifier is used to amplify the detection signal, filter the amplified signal, and transmit the filtered signal to the A / D conversion module;

[0010] The A / D conversion module is used to convert the detection signal into an electrical signal and feed it into a microprocessor;

[0011] The microprocessor is used to calculate the received electrical signal to obtain the gas concentration, and to make a determination based on the gas concentration to obtain a determination result of whether there is a partial discharge.

[0012] Preferably, the microprocessor is also used to send the determination result to the alarm through the network;

[0013] The alarm is activated to send out an alarm signal according to the determination result to remind the monitoring personnel.

[0014] Preferably, the remote host is also used to receive the electrical signal received by the microprocessor, and analyze the curve of partial discharge conditions of power facilities in the power grid based on the electrical signal, and is used to display monitoring information of the gas sensor and set the microprocessor.

[0015] Preferably, the power supply is used to provide stable power supply to multiple monitoring devices.

[0016] Preferably, the power supply includes a power supply, a resonant circuit, a step-down circuit and a voltage stabilizing circuit, the resonant circuit is connected to the power supply and the step-down circuit respectively, and the step-down circuit is connected to the resonant circuit and the voltage stabilizing circuit respectively.

[0017] Preferably, the power supply is a direct current power supply for providing power supply energy;

[0018] The resonant circuit is used to filter the provided power supply energy;

[0019] The step-down circuit is used to step down the voltage of the filtered power supply energy;

[0020] The voltage stabilizing circuit is used to stabilize the stepped-down power supply energy into stable power supply energy.

[0021] Preferably, it comprises a photovoltaic power taking module and a battery charging module, wherein the power taking module is connected to the battery charging module, and the battery charging module is connected to a power supply;

[0022] The photovoltaic power collection module is used to convert the solar tube into the electrical energy required for the operation of the entire monitoring device;

[0023] The battery charging module is used to charge the power supply with the electric energy generated by the photovoltaic power taking module.

[0024] Preferably, it comprises a voltage monitoring module and a temperature and humidity monitoring module, the voltage monitoring module is electrically connected to a power supply, the temperature and humidity monitoring module is installed on a cable, and the temperature and humidity monitoring module and the voltage monitoring module are electrically connected to an A / D conversion module;

[0025] The voltage monitoring module is used to monitor the voltage of the power supply in real time;

[0026] The temperature and humidity monitoring module is used to monitor the ambient temperature and humidity around the cable and detect whether the operating environment of the cable is healthy.

[0027] Preferably, it also includes an acoustic imaging module and an ultraviolet imaging module, wherein the acoustic imaging module and the ultraviolet imaging module are wirelessly connected to an analysis and positioning module, and the analysis and positioning module is installed inside the remote host;

[0028] The acoustic imaging module can generate an ultrasonic image by sending ultrasonic waves to the abnormal end and receiving the reflected ultrasonic signals, and then send the ultrasonic image to the analysis and positioning module;

[0029] The ultraviolet imaging module can receive the ultraviolet signal generated in the partial discharge phenomenon, generate an ultraviolet image according to the ultraviolet signal after receiving the reflection, and send the ultraviolet image to the analysis and positioning module;

[0030] The analysis and positioning module can determine the defective line end based on the gas sensor location information in the monitoring information, and locate the discharge point based on the gas concentration and monitoring time of multiple sensors in the monitoring information.

[0031] Preferably, the analysis and positioning module includes a data extraction unit, a data calculation unit and a position positioning unit, the output end of the data extraction unit is connected to the input end of the data calculation unit, and the output end of the data calculation unit is connected to the input end of the positioning unit;

[0032] The data extraction unit can extract the gas sensor position information in the monitoring information and the characteristic parameters of the discharge points in the ultrasonic image and the ultraviolet image, and transmit the extracted gas sensor position information and characteristic information to the data calculation unit;

[0033] The data calculation unit calculates according to the position information of the gas sensor to obtain the cable end where the discharge point is located, and calculates the distance between the discharge point and the gas sensor in combination with the characteristic parameters;

[0034] The position positioning unit determines the actual position of the maximum gas concentration according to the distance between the discharge point and the gas sensor and the actual position of the corresponding sensor, and marks it to complete the positioning of the discharge point.

[0035] Compared with the related art, the power grid partial discharge monitoring device based on gas detection provided by the present invention has the following beneficial effects:

[0036] The present invention sets a plurality of gas sensors to monitor the gas generated by rubber and other parts in power facilities due to the partial discharge phenomenon caused by high temperature, detects the generated gas, and outputs a detection signal to the outside, thereby determining whether the partial discharge phenomenon has occurred. In this way, it is not affected by whether the partial discharge is in the early stage, nor is it affected by whether the switch of the partial discharge is a closed switch. When partial discharge occurs, the rubber parts will generate gas due to the high temperature. Through the detection of the gas, the problem that the existing monitoring device adopts the sound amplification function and uses the decibel value to distinguish the partial discharge and cannot detect the initial partial discharge and the partial discharge of the closed switch can be solved, thereby improving the accuracy of partial discharge detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic structural diagram of a power grid partial discharge monitoring device based on gas detection provided by an embodiment of the present invention.

[0038] Figure 2 A schematic diagram of the structure of a monitoring device provided by an embodiment of the present invention.

[0039] Figure 3 A structural schematic diagram of a monitoring device provided in an embodiment of the present invention connected to a voltage monitoring module and a temperature and humidity monitoring module.

[0040] Figure 4 A schematic diagram of the structure of a power supply provided by an embodiment of the present invention.

[0041] Figure 5 A structural schematic diagram of a monitoring device provided by an embodiment of the present invention connected to an acoustic imaging module and an ultraviolet imaging module.

[0042] Figure 6A schematic diagram of the structure of an analysis and positioning module provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0044] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0045] In the description of the embodiments of the present invention, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, if the terms "first", "second", "third", etc. appear, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0046] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0047] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] The specific implementation of a power grid partial discharge monitoring device based on gas detection is described in detail below in conjunction with specific embodiments.

[0049] The present invention provides a power grid partial discharge monitoring device based on gas detection, comprising: a power supply, a plurality of monitoring devices, an alarm and a remote host, wherein the monitoring devices are equidistantly installed on a cable, the monitoring devices comprise a gas sensor, a signal amplifier, an A / D conversion module and a microprocessor, the gas sensor is sequentially connected to the signal amplifier, the A / D conversion module and the microprocessor, and the microprocessor is connected to the alarm and the remote host via a network;

[0050] In an embodiment of the present invention, according to Figure 1 As shown, the power supply is used to provide stable power supply to multiple monitoring devices;

[0051] The gas sensor is used to detect the gas generated by the rubber parts being subjected to high temperature due to partial discharge in the power facilities, and output a detection signal to the outside;

[0052] The signal amplifier amplifies the detection signal, filters the amplified signal, and transmits the filtered signal to the A / D conversion module;

[0053] The A / D conversion module is used to convert the detection signal into an electrical signal and feed it into a microprocessor;

[0054] The microprocessor calculates the gas concentration according to the received electrical signal, makes a determination according to the gas concentration, obtains the determination result, and sends the determination result to the alarm through the network;

[0055] The alarm is activated to send out an alarm signal according to the determination result to remind the monitoring personnel;

[0056] The remote host is used to receive the transmitted electrical signal, analyze the curve of the partial discharge of the power facilities in the power grid according to the received electrical signal, and display the gas sensor monitoring information and set the microprocessor.

[0057] It should be noted that the gas sensor group is composed of multiple common gas sensors connected in series, which can detect gases such as CO, SO2, and NO2, with a detection range of 5 to 500ppm, a sensitivity of <0.5, a response time of <60s, an operating temperature of -10°C to +50°C, a circuit voltage of 5V±0.2V, and an operating humidity of 10% to 95%RH;

[0058] The signal amplifier is a commonly used sensor signal amplifier with an input voltage of 1 to 3mV, an output voltage of 0 to 5V, an output current of 0 to 10mA, an operating voltage of 5 to 10V, and an operating temperature of -20°C to 80°C.

[0059] The A / D conversion module is a commonly used A / D conversion device with an input voltage of -10 to +10V, an operating temperature of -25 to 85°C, and a humidity of 5 to 95% RH;

[0060] A microprocessor is a common small processor that can perform digital signal operations;

[0061] The alarm is an electronic alarm with an operating voltage of AC220V, an operating temperature of -30°C to 70°C, and an operating humidity of 10% to 95%. The alarm is given by sounding an alarm.

[0062] The remote host is an ordinary computer that can receive signals from the microprocessor, display the gas sensor monitoring information and the curve of the partial discharge of the power facilities in real time on the display, and can remotely set the parameters of the microprocessor.

[0063] In an embodiment of the present invention, according to Figure 4 As shown, the power supply includes a power supply, a resonant circuit, a step-down circuit and a voltage stabilizing circuit. The resonant circuit is connected to the power supply and the step-down circuit respectively, and the step-down circuit is connected to the resonant circuit and the voltage stabilizing circuit respectively.

[0064] Preferably, the power supply is a direct current power supply for providing power supply energy;

[0065] The resonant circuit is used to filter the provided power supply energy;

[0066] The step-down circuit is used to step down the voltage of the filtered power supply;

[0067] The voltage stabilizing circuit is used to stabilize the stepped-down power supply energy into stable power supply energy.

[0068] It should be noted that: the voltage stabilizing circuit is used to stabilize the stepped-down power supply energy into a stable power supply energy, and the power supply is pressed into a DC power supply to ensure that the voltage value of the power supply energy does not change when the load changes;

[0069] In an embodiment of the present invention, according to Figure 3 As shown, the monitoring device also includes a photovoltaic power extraction module and a battery charging module, the power extraction module is connected to the battery charging module, and the battery charging module is connected to the power supply;

[0070] The photovoltaic power collection module is used to convert the solar tube into the electrical energy required for the operation of the entire monitoring device;

[0071] The battery charging module is used to charge the power supply with the electric energy generated by the photovoltaic power taking module.

[0072] In an embodiment of the present invention, according to Figure 3 As shown, the monitoring device also includes a voltage monitoring module and a temperature and humidity monitoring module, the voltage monitoring module is electrically connected to a power supply, the temperature and humidity monitoring module is installed on a cable, and the temperature and humidity monitoring module and the voltage monitoring module are electrically connected to an A / D conversion module;

[0073] The voltage monitoring module is used to monitor the voltage of the power supply in real time;

[0074] The temperature and humidity monitoring module is used to monitor the ambient temperature and humidity around the cable and detect whether the operating environment of the cable is healthy.

[0075] It should be noted that the temperature and humidity monitoring module can be used to detect whether the operating environment of the cable is healthy and ensure that the system equipment is not in harsh conditions such as high temperature and high humidity. If high temperature and high humidity occur, the temperature and humidity change trends need to be combined with the partial discharge data for analysis, and the abnormal situation should be reported to the background alarm.

[0076] In an embodiment of the present invention, according to Figure 5 As shown, it also includes an acoustic wave imaging module and an ultraviolet imaging module. The acoustic wave imaging module and the ultraviolet imaging module are wirelessly connected to an analysis and positioning module, and the analysis and positioning module is installed inside a remote host.

[0077] The ultraviolet imaging module can receive the ultraviolet signal generated in the partial discharge phenomenon, generate an ultraviolet image according to the ultraviolet signal after receiving the reflection, and send the ultraviolet image to the analysis and positioning module;

[0078] The acoustic imaging module can generate an ultrasonic image by sending ultrasonic waves to the abnormal end and receiving the reflected ultrasonic signals, and then send the ultrasonic image to the analysis and positioning module;

[0079] The analysis and positioning module can determine the defective line end based on the gas sensor location information in the monitoring information, and locate the discharge point based on the gas concentration and monitoring time of multiple sensors in the monitoring information.

[0080] In an embodiment of the present invention, according to Figure 5 As shown, the analysis and positioning module includes a data extraction unit, a data calculation unit and a position positioning unit, the output end of the data extraction unit is connected to the input end of the data calculation unit, and the output end of the data calculation unit is connected to the input end of the positioning unit;

[0081] The data extraction unit can extract the gas sensor position information in the monitoring information and the characteristic parameters of the discharge points in the ultrasonic image and the ultraviolet image, and transmit the extracted gas sensor position information and characteristic information to the data calculation unit;

[0082] The data calculation unit calculates according to the position information of the gas sensor to obtain the cable end where the discharge point is located, and calculates the distance between the discharge point and the gas sensor in combination with the characteristic parameters;

[0083] The position positioning unit determines the actual position of the maximum gas concentration according to the distance between the discharge point and the gas sensor and the actual position of the corresponding sensor, and marks it to complete the positioning of the discharge point.

[0084] It should be noted that the monitoring information includes the corresponding information of the sensor that monitors the partial discharge phenomenon. The gas sensor location information can be converted into the actual location according to the data extraction module. The ultrasonic image includes the image of the corresponding cable segment, and its image content includes the sensor and the discharge point, while the ultraviolet image includes the image of the discharge point. By extracting the image features, they can be combined with each other to determine the position of the discharge point. When the gas sensor measures an abnormality, the ultraviolet light generated by the partial discharge can be received by the ultraviolet module to complete the determination of the discharge point. After the discharge point is determined, the acoustic imaging module can be controlled to send an ultrasonic wave to the vicinity of the discharge point, and an ultrasonic image can be generated based on the received reflected ultrasonic signal. The generated ultrasonic image needs to include the gas sensor and the discharge point to facilitate the subsequent positioning of the discharge point.

[0085] The working principle of a power grid partial discharge monitoring device based on gas detection provided by the present invention is as follows:

[0086] Install the gas sensor at a certain distance inside the pipeline or tunnel, near the cable, correctly connect the gas sensor signal, amplifier, A / D conversion module, microprocessor, and alarm, turn on the power supply, and calibrate the gas sensor after it is preheated.

[0087] Sensor calibration

[0088] When the cable is free of defects, the concentrations of the three characteristic gases detected by the gas sensor are close to 0, and the alarm does not work; then the corresponding gas sensors are tested with three characteristic gases of a certain concentration (such as 10ppm), so that the gas concentration calculated by the microprocessor is approximately equal to the corresponding concentration, the alarm sends an alarm signal, and sends relevant sensor monitoring information to the remote host. After the calibration is completed, defects exceeding the set concentration can be monitored.

[0089] Sensor monitoring

[0090] During normal operation, the gas environment around the cable is air, and the content of the characteristic gases to be detected (such as CO, SO2, and NO2, etc.) in the air is extremely small. The signals detected by the gas sensors of the three characteristic gases cannot reach the set values ​​after calculation by the microprocessor, and the alarm does not sound.

[0091] When local discharge or overheating occurs somewhere inside the cable, or even both occur simultaneously, the cable's insulation layer (mainly rubber) begins to decompose, gradually producing characteristic gases such as CO, SO2, and NO2.

[0092] These characteristic gases gradually accumulate near the defect. The gas sensor closest to the defect detects abnormal concentrations of one or more of the characteristic gases. For example, if one of CO, SO2, and NO2 exceeds the set concentration, or if CO and SO2, CO and NO2, or SO2 and NO2 exceed the set concentrations at the same time, or if CO, SO2, and NO2 exceed the set concentrations at the same time, the alarm will send an alarm signal and send monitoring information to the remote host.

[0093] The defective line segment can be determined based on the gas sensor position information in the monitoring information, and the discharge point can be located through the ultraviolet imaging module, the acoustic imaging module and the analysis and positioning module, so that the user can more accurately determine the corresponding line segment when performing maintenance.

[0094] The modules or units in the device of the embodiment of the present invention can be combined, divided and deleted according to actual needs. The above disclosure is only the preferred embodiment of the present invention, and of course it cannot be used to limit the scope of the rights of the present invention. Those skilled in the art can understand that all or part of the processes of the above embodiment are implemented, and the equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A power grid partial discharge monitoring device based on gas detection, characterized in that: include: A power supply, a plurality of monitoring devices, an alarm and a remote host, wherein the monitoring devices are equidistantly installed on the cable, the monitoring devices include a gas sensor, a signal amplifier, an A / D conversion module and a microprocessor, the gas sensor is sequentially connected to the signal amplifier, the A / D conversion module and the microprocessor, and the microprocessor is connected to the alarm and the remote host via a network; The gas sensor is used to detect the gas generated by the rubber parts being subjected to high temperature due to partial discharge in the power facilities, and output a detection signal to the outside; The signal amplifier is used to amplify the detection signal, filter the amplified signal, and transmit the filtered signal to the A / D conversion module; The A / D conversion module is used to convert the detection signal into an electrical signal and feed it into a microprocessor; The microprocessor is used to calculate the received electrical signal to obtain the gas concentration, and to determine whether there is a partial discharge according to the gas concentration; It also includes an acoustic imaging module and an ultraviolet imaging module, wherein the acoustic imaging module and the ultraviolet imaging module are wirelessly connected to an analysis and positioning module, and the analysis and positioning module is installed inside a remote host; The ultraviolet imaging module is used to receive the ultraviolet signal generated in the partial discharge phenomenon when the gas sensor measures an abnormality, generate an ultraviolet image based on the ultraviolet signal after receiving the reflection, and send the ultraviolet image to the analysis and positioning module; wherein the ultraviolet image includes an image of the discharge point; The acoustic wave imaging module is used to send ultrasonic waves near the discharge point after the discharge point is determined, and generate an ultrasonic image according to the received reflected ultrasonic signal, and send the ultrasonic image to the analysis and positioning module; wherein the ultrasonic image includes the gas sensor and the discharge point of the corresponding cable segment; The analysis and positioning module determines the defective cable end based on the gas sensor location information in the monitoring information, and locates the discharge point by combining the ultrasonic image and ultraviolet image; The analysis and positioning module includes a data extraction unit, a data calculation unit and a position positioning unit, the output end of the data extraction unit is connected to the input end of the data calculation unit, and the output end of the data calculation unit is connected to the input end of the position positioning unit; A data extraction unit converts the gas sensor position information in the monitoring information into an actual position, extracts characteristic parameters of the discharge point in the ultrasonic image and the ultraviolet image, and transmits the converted actual position information of the gas sensor and the extracted characteristic parameters to the data calculation unit; The data calculation unit calculates according to the actual position information of the gas sensor to obtain the cable end where the discharge point is located, and calculates the distance between the discharge point and the gas sensor in combination with the characteristic parameters; The position positioning unit determines the actual position of the maximum gas concentration according to the distance between the discharge point and the gas sensor and the actual position of the corresponding sensor, and marks it to complete the positioning of the discharge point.

2. The power grid partial discharge monitoring device based on gas detection according to claim 1 is characterized in that: The microprocessor is also used to send the determination result to the alarm device through the network; The alarm is activated to send out an alarm signal according to the determination result to remind the monitoring personnel.

3. The power grid partial discharge monitoring device based on gas detection according to claim 1 is characterized in that: The remote host is used to receive the electrical signal received by the microprocessor, and analyze the curve of the partial discharge of the power facilities in the power grid according to the electrical signal, and is also used to display the monitoring information of the gas sensor and set the microprocessor.

4. The power grid partial discharge monitoring device based on gas detection according to claim 1 is characterized in that: The power supply is used to provide stable power supply to multiple monitoring devices.

5. The power grid partial discharge monitoring device based on gas detection according to claim 4 is characterized in that: The power supply includes a power supply, a resonant circuit, a step-down circuit and a voltage stabilizing circuit. The resonant circuit is connected to the power supply and the step-down circuit respectively, and the step-down circuit is connected to the resonant circuit and the voltage stabilizing circuit respectively.

6. The power grid partial discharge monitoring device based on gas detection according to claim 5 is characterized in that: The power supply is a direct current power supply, which is used to provide power supply energy; The resonant circuit is used to filter the provided power supply energy; The step-down circuit is used to step down the voltage of the filtered power supply energy; The voltage stabilizing circuit is used to stabilize the stepped-down power supply energy into stable power supply energy.

7. The power grid partial discharge monitoring device based on gas detection according to claim 1 is characterized in that: It includes a photovoltaic power taking module and a battery charging module, wherein the photovoltaic power taking module is connected to the battery charging module, and the battery charging module is connected to a power supply; The photovoltaic power collection module is used to convert solar energy into the electrical energy required for the operation of the entire monitoring device; The battery charging module is used to charge the power supply with the electric energy generated by the photovoltaic power taking module.

8. The power grid partial discharge monitoring device based on gas detection according to claim 7 is characterized in that: It includes a voltage monitoring module and a temperature and humidity monitoring module, the voltage monitoring module is electrically connected to a power supply, the temperature and humidity monitoring module is installed on a cable, and the temperature and humidity monitoring module and the voltage monitoring module are electrically connected to an A / D conversion module; The voltage monitoring module is used to monitor the voltage of the power supply in real time; The temperature and humidity monitoring module is used to monitor the ambient temperature and humidity around the cable and detect whether the operating environment of the cable is healthy.

Images