GIS partial discharge detection device with automatic calibration function

Abstract

The utility model relates to the technical field of GIS equipment monitoring, in particular to a GIS partial discharge detection device with an automatic calibration function, which comprises a detector connected with a standardized signal source through a lead. A magnetic attraction mechanism is arranged on the detector, the magnetic attraction mechanism comprises a connecting plate, the connecting plate is connected with the detector, a mounting frame and two magnetic strips are connected to the face, away from the detector, of the connecting plate, and a rubber ring is connected to the mounting frame; and a liquid outlet mechanism is arranged on the magnetic suction mechanism. Through the arrangement of the standardized signal source, when the detector is used, the standardized signal source outputs a preset standard partial discharge calibration signal after receiving an instruction, the calibration signal is conducted to a sensing receiving end of the detector along the outer wall of a GIS pipeline, and an automatic calibration module in the detector collects the standard signal in real time; and automatic calibration and precision correction of the detection system can be rapidly completed.

Description

Technical Field

[0001] This utility model relates to the field of GIS equipment monitoring technology, specifically a GIS partial discharge detection device with automatic calibration function. Background Technology

[0002] During operation, GIS equipment is subjected to various factors (electrical, thermal, mechanical, environmental, etc.), resulting in complex internal chemical and physical changes that gradually degrade its performance—a phenomenon known as aging. To ensure equipment quality and system power supply reliability, rigorous quality checks are conducted before equipment is put into operation, largely eliminating accidents caused by quality issues. However, to maximize the production capacity of GIS equipment, daily scientific management and maintenance are often necessary. Online monitoring and fault diagnosis of GIS equipment are of great significance. Currently, condition-based maintenance based on condition monitoring and fault diagnosis is being developed. Adopting condition monitoring and fault diagnosis technologies allows for a transition from preventative maintenance to predictive maintenance, or condition-based maintenance, from "mandatory repairs upon expiration" to "repairs only when necessary." Partial discharge detection of GIS can effectively detect early insulation defects, allowing for preventative measures to be taken to prevent further development and improve GIS reliability. It can also compensate for the limitations of withstand voltage testing. Online partial discharge monitoring can detect the "cleanliness" of GIS manufacturing and installation, identify defects and errors in insulation manufacturing processes and installation, and pinpoint fault locations, enabling effective handling and ensuring safe equipment operation.

[0003] Chinese patent CN220399571U discloses an "Online Monitoring Device for Partial Discharge in GIS," comprising: an ultra-high frequency (UHF) sensor module for receiving pulse signals of partial discharge; a signal conditioning module connected to the UHF sensor module for filtering out useless signals and retaining the partial discharge pulse envelope signal; and a signal acquisition and processing module connected to the signal conditioning module for peak detection and calibration of the partial discharge pulse envelope signal processed by the signal conditioning module. This online monitoring device for partial discharge in GIS effectively collects partial discharge phenomena inside and outside the GIS tank through the UHF sensor module and filters the collected signals through the signal conditioning module, thereby effectively collecting and detecting partial discharge signals generated by the GIS tank and distinguishing environmental noise interference, thus improving the reliability of GIS operation.

[0004] In practical use, existing GIS partial discharge monitoring devices require calibration before each detection to ensure accuracy. Manual calibration requires the use of external calibration equipment and a series of calibration operations, which is cumbersome and affects work efficiency. Therefore, a GIS partial discharge detection device with automatic calibration function is proposed to solve the above-mentioned problems. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a GIS partial discharge detection device with automatic calibration function, which solves the problem of cumbersome manual calibration of existing GIS partial discharge online monitoring devices mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a GIS partial discharge detection device with automatic calibration function, comprising a detector, a standardized signal source connected to the detector via wires, and a magnetic block connected to the standardized signal source; the detector is provided with a magnetic attraction mechanism, the magnetic attraction mechanism comprising a connecting plate connected to the detector, a mounting frame and two magnetic strips connected to the side of the connecting plate away from the detector, and a rubber ring connected to the mounting frame; the magnetic attraction mechanism is provided with a liquid dispensing mechanism for injecting coupling agent into the rubber ring during detector installation, and the rubber ring is provided with an overflow groove for discharging the coupling agent.

[0007] Preferably, the connecting plate, mounting frame, rubber ring and magnetic strip all adopt an arc-shaped curved surface structure, which is adapted to the curvature of the outer wall of the GIS pipeline.

[0008] Preferably, the connecting plate and the mounting frame are both made of elastic material, the magnetic strip is a flexible magnet, and the rubber ring is made of flexible rubber.

[0009] Preferably, the liquid dispensing mechanism includes a liquid box, which has a first chamber and two second chambers. The two second chambers are located on both sides of the first chamber. A pressure block is slidably connected to the first chamber. A one-way groove is provided between the first chamber and the second chambers. Multiple injection tubes are fixedly connected through the mounting frame. The two ends of the injection tubes are respectively connected to the inside of the rubber ring and the first chamber.

[0010] Preferably, the pressure block protrudes from the surface of the liquid box, and multiple leaf springs are installed between the pressure block and the first chamber.

[0011] Preferably, the one-way groove is provided with a one-way diaphragm, and the injection tube is provided with a one-way valve.

[0012] Preferably, the liquid box is equipped with two replenishment tubes, which are respectively connected to two second chambers, and the top of the replenishment tubes is provided with a one-way injection port.

[0013] Preferably, a sliding plate is slidably connected to the second chamber, the sliding plate being used to close the second chamber, and the sliding plate being able to slide into the second chamber as the coupling fluid inside the second chamber decreases.

[0014] Preferably, the slide plate is connected to a ramp panel on the side near the inner wall of the second chamber, and the ramp panel is provided with a slope facing the one-way groove.

[0015] Preferably, the slope panel is provided with a groove that can cover the connection between the replenishment pipe and the second chamber.

[0016] As can be seen from the above technical solutions, the GIS partial discharge detection device with automatic calibration function provided in the embodiments of this specification has at least the following beneficial effects:

[0017] 1. This utility model, through the setting of a standardized signal source, enables the detector to output a preset standard partial discharge calibration signal after receiving an instruction. The calibration signal is transmitted along the outer wall of the GIS pipeline to the sensor receiving end of the detector. The automatic calibration module inside the detector collects the standard signal in real time, quickly completing the automatic calibration and accuracy correction of the detection system, ensuring the authenticity and accuracy of the detection data, meeting the needs of efficient and high-precision calibration on site, reducing the operation steps of manual calibration, and avoiding dependence on external calibration equipment. Through the setting of the magnetic attraction mechanism, the operator can connect the detector to the outer wall of the GIS pipeline using two magnetic strips, making the operation more convenient.

[0018] 2. This utility model achieves quantitative supply and automatic addition of coupling agent through the setting of the liquid dispensing mechanism. While the detector is attached to the outer wall of the GIS pipeline, the first chamber injects coupling agent into the rubber ring through two liquid injection pipes. The excess coupling agent in the rubber ring is then evenly squeezed out through the overflow groove to the bonding surface between the rubber ring and the outer wall of the pipeline, forming a continuous and uniform coupling layer. This reduces signal attenuation, eliminates the need for manual application, and improves on-site operation efficiency. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the present invention, form part of this application:

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the magnetic attraction mechanism in this utility model;

[0022] Figure 3 This is a schematic diagram of the liquid dispensing mechanism in this utility model;

[0023] Figure 4 This is a schematic diagram of the liquid box structure in this utility model;

[0024] Figure 5 This is a schematic diagram of the skateboard structure in this utility model;

[0025] Figure 6 This is a schematic diagram of the slope panel structure in this utility model.

[0026] In the diagram: 1. Detector; 2. Standardized signal source; 3. Magnetic block; 4. Magnetic attraction mechanism; 41. Connecting plate; 42. Mounting frame; 43. Rubber ring; 44. Magnetic strip; 5. Liquid dispensing mechanism; 51. Liquid box; 511. First chamber; 512. Second chamber; 513. One-way groove; 52. Pressure block; 53. Leaf spring; 54. Injection tube; 55. Slide plate; 56. Replenishment tube; 57. Sloping panel. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figures 1-3As shown, a GIS partial discharge detection device with automatic calibration function includes a detector 1. A standardized signal source 2 is connected to the detector 1 via wires, and a magnetic block 3 is connected to the standardized signal source 2. The wires are used to transmit both the trigger control command of the detector 1 to the standardized signal source 2 and the calibration signal feedback data, forming an electronically controlled automatic calibration path. The standardized signal source 2 is an external standard partial discharge analog signal generator unit, which can output a quantitative standard calibration signal with amplitude and frequency conforming to the GIS partial discharge detection specifications. It is used to simulate the partial discharge signal generated by actual internal defects in GIS, providing a reference for automatic calibration. The magnetic block 3 is used to stably magnetically fix the standardized signal source 2 to the outer wall of the GIS pipe, so that the standardized signal source 2 and the detector 1 are on the same outer wall surface of the pipe, ensuring that the propagation path of the calibration signal is completely consistent with the signal path during actual detection, eliminating calibration errors caused by path differences. The detector 1 integrates an automatic calibration module, and the main panel is equipped with a calibration module. The system features an automatic calibration option. In actual field operation, the operator only needs to press this option to trigger the entire automatic calibration process with one click. After the automatic calibration process is triggered, detector 1 sends a trigger command to standardized signal source 2 via a wire. Upon receiving the command, standardized signal source 2 immediately outputs a preset standard partial discharge calibration signal. The calibration signal is transmitted along the outer wall of the GIS metal pipe to the sensing receiver of detector 1. The automatic calibration module inside detector 1 acquires the standard signal in real time and compares it with the national standard reference parameters stored in the module for amplitude, phase, and signal-to-noise ratio, and performs logical operations. It automatically identifies the sensitivity deviation, gain drift, and signal attenuation error in the detection channel and directly performs digital correction and parameter compensation for the sensing unit and acquisition unit. The entire process does not require manual reading of values ​​or manual adjustment of equipment parameters, and can quickly complete the automatic calibration and accuracy correction of the detection system, ensuring the authenticity and accuracy of the detection data and meeting the needs of efficient and high-precision calibration in the field.

[0029] Furthermore, the detector 1 is equipped with a magnetic attraction mechanism 4, which includes a connecting plate 41 connected to the detector 1. A mounting frame 42 and two magnetic strips 44 are connected to the side of the connecting plate 41 away from the detector 1. A rubber ring 43 is connected to the mounting frame 42. The connecting plate 41, mounting frame 42, rubber ring 43, and magnetic strips 44 all adopt an arc-shaped curved surface structure, which adapts to the curvature of the outer wall of the GIS pipe. The connecting plate 41 and mounting frame 42 are made of elastic material, the magnetic strips 44 are flexible magnets, and the rubber ring 43 is made of flexible rubber. The connection between the connecting plate 41 and the detector 1 achieves integrated assembly of the overall structure. The mounting frame 42 supports the rubber ring 43. The two magnetic strips 44 are symmetrically arranged inside the mounting frame 42, forming a balanced magnetic attraction force, ensuring that the detector 1 is evenly stressed and adheres well to the detector. The structure is stable and the curved surface can match and fit the cylindrical curved surface contour of the outer wall of the GIS pipe, thereby eliminating contact gaps. The connecting plate 41 and the mounting frame 42 are made of elastic material, which can adapt to the curvature of the outer wall of GIS pipes of various diameters, thus broadening the range of compatibility. The magnetic strip 44 made of flexible magnetic material can deform with the outer wall of the GIS pipe, thereby maintaining a tight adsorption with the outer wall of the GIS pipe. The rubber ring 43 is located outside the two magnetic strips 44. When the magnetic strips 44 are adsorbed with the outer wall of the GIS pipe, the rubber ring 43 is in direct contact with the outer wall of the GIS pipe and is squeezed, thereby filling the tiny contact gaps, improving the sealing and fitting effect, and avoiding the impact of air gaps between the detector 1 and the magnetic attraction mechanism 4 and the outer wall of the GIS pipe on the effective transmission of ultrasonic, ultra-high frequency partial discharge and calibration signals.

[0030] In this embodiment, by setting up a standardized signal source 2, when the detector 1 is in use, the standardized signal source 2 outputs a preset standard partial discharge calibration signal after receiving the instruction. The calibration signal is transmitted along the outer wall of the GIS pipeline to the sensing receiver of the detector 1. The automatic calibration module inside the detector 1 collects the standard signal in real time, quickly completes the automatic calibration and accuracy correction of the detection system, ensures the authenticity and accuracy of the detection data, meets the needs of efficient and high-precision calibration on site, reduces the operation steps of manual calibration, and avoids dependence on external calibration equipment. With the setting of the magnetic attraction mechanism 4, the operator can connect the detector 1 to the outer wall of the GIS pipeline using two magnetic strips 44, which is more convenient to operate.

[0031] Please see Figures 2-6As shown, the magnetic attraction mechanism 4 is equipped with a liquid dispensing mechanism 5, which is used to inject coupling agent into the rubber ring 43 when installing the detector 1. The rubber ring 43 is equipped with an overflow groove for squeezing out the coupling agent. The liquid dispensing mechanism 5 includes a liquid box 51, which has a first chamber 511 and two second chambers 512. The two second chambers 512 are located on both sides of the first chamber 511. A pressure block 52 is slidably connected to the first chamber 511. A one-way groove 513 is opened between the first chamber 511 and the second chambers 512. Multiple injection tubes 54 are fixedly connected through the mounting frame 42. The rubber ring 43 is hollow inside. The two ends of the injection tubes 54 are respectively connected to the inside of the rubber ring 43 and the first chamber 512. 11. A pressure block 52 protrudes from the surface of the liquid box 51. Multiple leaf springs 53 are installed between the pressure block 52 and the first chamber 511. A one-way diaphragm is installed in the one-way groove 513. A one-way valve is installed in the injection pipe 54. The first chamber 511 is used to directly store the coupling agent to be squeezed and transported and to provide sliding guide space for the pressure block 52. Two second chambers 512 are used to store spare coupling agent. They are connected to the first chamber 511 through the one-way groove 513 to form a supply relationship. The part of the pressure block 52 protruding from the surface of the liquid box 51 is located between the outer wall of the GIS pipe and the liquid box 51. When the detector 1 is installed using the magnetic attraction mechanism 4, after the two magnetic strips 44 are attracted to the outer wall of the GIS pipe, the rubber ring 43 is subjected to During compression, the outer wall of the GIS pipe applies pressure to the protruding pressure block 52, causing the pressure block 52 to contract into the first chamber 511. This compresses the coupling agent within the first chamber 511, and the compressed coupling agent enters the hollow rubber ring 43 through the injection pipe 54. Excess coupling agent within the rubber ring 43 is then evenly extruded through the overflow groove to the contact surface between the rubber ring 43 and the outer wall of the pipe, forming a continuous and uniform coupling layer to reduce signal attenuation. Multiple injection pipes 54 are arranged through the mounting frame 42 to evenly deliver the coupling agent to different positions of the hollow rubber ring 43, avoiding localized liquid accumulation or insufficient supply. This ensures that the coupling agent is evenly distributed through the overflow groove, while multiple leaf springs 53 provide power to the pressure block 52. The elastic reset force allows the pressure block 52 to reset via the spring force of the leaf spring 53 after the detector 1 is disassembled. At the same time, the pressure block 52 creates a negative pressure in the first chamber 511, causing the first chamber 511 to draw the coupling agent from the two second chambers 512 into the first chamber 511 through the two one-way grooves 513 for replenishment, in preparation for the next test. The one-way diaphragm in the one-way groove 513 only allows the coupling agent to flow unidirectionally from the second chamber 512 to the first chamber 511, and the one-way valve in the injection tube 54 only allows the coupling agent to flow unidirectionally from the first chamber 511 to the inside of the rubber ring 43. The two work together to block the reverse flow path of the coupling agent, ensuring a single liquid supply direction and a stable and controllable liquid output.

[0032] In addition, two replenishment pipes 56 are installed on the liquid box 51. The two replenishment pipes 56 are respectively connected to the two second chambers 512. The top of the replenishment pipe 56 is provided with a one-way injection port. The replenishment pipe 56 is used to replenish the coupling agent into the second chamber 512. The one-way injection port at the top of the pipe only allows external coupling agent to be injected in one direction, which can prevent internal coupling agent leakage and evaporation, and at the same time block external dust, water vapor and other impurities from entering the chamber and contaminating the coupling agent. A sliding plate 55 is slidably connected inside the second chamber 512. The sliding plate 55 is used to close the second chamber 512. The sliding plate 55 can move to the second chamber 512 as the coupling agent in the second chamber 512 decreases. The slide plate 55 slides within the second chamber 512, forming a sliding seal with the inner wall of the second chamber 512. As the coupling agent in the second chamber 512 is consumed, the slide plate 55 slides synchronously into the first chamber 511 under negative pressure, keeping the slide plate 55 in contact with the coupling agent surface to maintain stable pressure in the second chamber 512. This avoids the formation of cavities inside the second chamber 512, which could lead to intermittent liquid supply and unstable liquid output. It ensures that the coupling agent in the second chamber 512 can be continuously and smoothly replenished to the first chamber 511 through the one-way groove 513, guaranteeing the reliability of the liquid outlet mechanism 5 for long-term continuous operation.

[0033] In addition, a ramp plate 57 is connected to the side of the slide plate 55 near the inner wall of the second chamber 512. The ramp plate 57 has a slope facing the one-way groove 513 and a slot that can cover the connection between the replenishment tube 56 and the second chamber 512. The slope of the ramp plate 57 faces the one-way groove 513, which can guide the coupling agent in the second chamber 512. When the coupling agent in the second chamber 512 is about to be exhausted, the ramp plate 57 first contacts the inner wall of the second chamber 512. At this time, there is a gap between the slope of the ramp plate 57 and the one-way groove 513, and the ramp plate 57 is sandwiched between the slide plate 55 and the inner wall of the second chamber 512, so that the slide plate 55 does not completely fit the second chamber 512. The inner wall of chamber 512 blocks the one-way groove 513, thus ensuring that the one-way groove 513 remains unobstructed. This ensures that most of the coupling agent in the second chamber 512 can be smoothly squeezed into the one-way groove 513. When the coupling agent in the second chamber 512 is exhausted, the groove on the slope panel 57 and the connection between the replenishment pipe 56 and the second chamber 512 are aligned. At this time, the coupling agent is replenished through the replenishment pipe 56. After entering the second chamber 512, the coupling agent first enters the groove. Then, during the continuous replenishment process, the coupling agent fills the space between the slope panel 57 and the inner wall of the second chamber 512 through the groove. Subsequently, the slope panel 57 and the slide plate 55 are lifted, causing the slide plate 55 to slide outward and reset.

[0034] In this embodiment, the liquid dispensing mechanism 5 enables the quantitative supply and automatic addition of coupling agent. While the detector 1 is attached to the outer wall of the GIS pipeline, the first chamber 511 injects coupling agent into the rubber ring 43 through two injection tubes 54. Excess coupling agent in the rubber ring 43 is then evenly squeezed out through the overflow groove to the bonding surface between the rubber ring 43 and the outer wall of the pipeline, forming a continuous and uniform coupling layer. This reduces signal attenuation, eliminates the need for manual application, and improves on-site operation efficiency.

[0035] In the use of the GIS partial discharge detection device with automatic calibration function of this utility model, the standardized signal source 2 is first magnetically fixed to the outer wall of the GIS pipe by the magnetic block 3. Then, the detector 1 is attracted to the corresponding position on the outer wall of the same GIS pipe by the two magnetic strips 44 of the magnetic attraction mechanism 4. The rubber ring 43 is compressed and fills the contact gap between itself and the outer wall of the GIS pipe. During the installation process, the outer wall of the GIS pipe simultaneously compresses the pressure block 52, and the pressure block 52 compresses the leaf spring 53 and contracts into the first chamber 511, squeezing the coupling agent stored in the first chamber 511. The coupling agent flows into the rubber ring 43 through the injection pipe 54, and the coupling agent in the rubber ring 43 is evenly squeezed out through the overflow groove. A coupling layer is formed on the bonding surface; then, the automatic calibration operation option on the main panel of detector 1 is pressed. The built-in automatic calibration module sends a trigger command to the standardized signal source 2 through the wire. The standardized signal source 2 outputs a quantitative standard calibration signal that conforms to the specification. The signal is transmitted along the outer wall of the GIS pipeline to the sensing receiver of detector 1. The automatic calibration module collects the signal in real time and compares it with the pre-stored national standard reference parameters in terms of amplitude, phase, and signal-to-noise ratio, and performs logical operations. It automatically identifies the sensitivity deviation, gain drift, and signal attenuation error of the detection channel, and then performs digital correction and parameter compensation on the sensing unit and acquisition unit of detector 1 to quickly complete the automatic calibration.

[0036] The above embodiments are only used to illustrate the present utility model, and are not intended to limit the present utility model. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present utility model. Therefore, all equivalent technical solutions also fall within the scope of the present utility model. The patent protection scope of the present utility model should be defined by the claims.

Claims

1. A GIS partial discharge detection device with automatic calibration function, comprising a detector (1), characterized in that: The detector (1) is connected with a standard signal source (2) through a wire, and the standard signal source (2) is connected with a magnetic block (3); The detector (1) is provided with a magnetic attraction mechanism (4), the magnetic attraction mechanism (4) comprises a connecting plate (41), the connecting plate (41) is connected with the detector (1), and the side, away from the detector (1), of the connecting plate (41) is connected with a mounting frame (42) and two magnetic strips (44); the mounting frame (42) is connected with a rubber ring (43); The magnetic attraction mechanism (4) is provided with a liquid outlet mechanism (5) for injecting the coupling agent into the rubber ring (43) when the detector (1) is installed, and the rubber ring (43) is provided with an overflow groove for extruding the coupling agent.

2. The GIS partial discharge detection device with automatic calibration function according to claim 1, characterized in that: The connecting plate (41), the mounting frame (42), the rubber ring (43) and the magnetic strip (44) all adopt an arc curved surface structure, and the arc curved surface is adapted to the outer wall arc of the GIS pipeline.

3. The GIS partial discharge detection device with automatic calibration function according to claim 2, characterized in that: The connecting plate (41) and the mounting frame (42) are both made of elastic material, the magnetic strip (44) is a flexible magnet, and the rubber ring (43) is made of flexible rubber material.

4. The GIS partial discharge detection device with automatic calibration function according to claim 2, characterized in that: The liquid outlet mechanism (5) comprises a liquid box (51), the liquid box (51) is provided with a first chamber (511) and two second chambers (512), the two second chambers (512) are located on the two sides of the first chamber (511) respectively, the first chamber (511) is slidably connected with a pressing block (52), a one-way groove (513) is arranged between the first chamber (511) and the second chamber (512), a plurality of liquid injection pipes (54) are fixedly connected to the mounting frame (42) in a penetrating mode, and the two ends of the liquid injection pipe (54) are respectively communicated with the inside of the rubber ring (43) and the first chamber (511).

5. The GIS partial discharge detection device with automatic calibration function according to claim 4, characterized in that: The pressing block (52) protrudes from the surface of the liquid box (51), and a plurality of leaf springs (53) are arranged between the pressing block (52) and the first chamber (511).

6. The GIS partial discharge detection device with automatic calibration function according to claim 5, characterized in that: A one-way membrane is arranged in the one-way groove (513), and a one-way valve is arranged in the liquid injection pipe (54).

7. The GIS partial discharge detection device with automatic calibration function according to claim 6, characterized in that: Two liquid supplement pipes (56) are arranged on the liquid box (51) and are respectively communicated with the two second chambers (512), and the liquid supplement pipe (56) is provided with a one-way liquid injection port at the top.

8. The GIS partial discharge detection device with automatic calibration function according to claim 7, characterized in that: A sliding plate (55) is slidably connected in the second chamber (512), the sliding plate (55) is used for closing the second chamber (512), and the sliding plate (55) can slide into the second chamber (512) with the decrease of the coupling liquid in the second chamber (512).

9. The GIS partial discharge detection device with automatic calibration function according to claim 8, characterized in that: A slope plate (57) is connected to the side, close to the inner wall of the second chamber (512), of the sliding plate (55), and the slope plate (57) is provided with a slope surface facing the one-way groove (513).

10. The GIS partial discharge detection device with automatic calibration function according to claim 9, characterized in that: A notch is arranged on the slope plate (57), and the notch can cover the connection between the liquid supplement pipe (56) and the second chamber (512).

Images