Partial discharge sensor calibration device

Abstract

The utility model discloses a partial discharge sensor calibration device, belongs to the technical field of sensor calibration, and aims to solve the problems that in the prior art, a partial discharge calibrator and a partial discharge sensor are exposed on an operation table in the calibration process, and the calibration result is easily influenced by electrostatic interference in an external environment and electromagnetic interference generated by an alternating electric field. And errors exist in the calibration of the partial discharge sensor. The partial discharge sensor calibration device comprises a calibration table, a partial discharge calibrator is arranged on the calibration table, the calibration table is further covered with a shielding cover, electrostatic shielding layers are arranged in the calibration table and the wall of the shielding cover, and conductive contact blocks used for being in contact with the electrostatic shielding layers in the shielding cover are arranged on the upper surface of the calibration table. The partial discharge sensor calibration device can form a closed electrostatic shielding shell for calibrating a partial discharge sensor, can effectively prevent electrostatic interference and interference of an alternating electric field in an external environment, and ensures that the calibration result of the partial discharge sensor is accurate and effective.

Description

Technical Field

[0001] The utility model belongs to the technical field of sensor calibration, and particularly relates to a partial discharge sensor calibration device. Background Art

[0002] A partial discharge sensor, namely a local discharge sensor, is mainly used for monitoring local discharge phenomena in power equipment. Local discharge is a common fault phenomenon in the insulation system of power equipment, which may lead to insulation deterioration and then cause equipment failures or even accidents. The partial discharge sensor realizes the monitoring and evaluation of the equipment state by capturing and analyzing various physical signals generated by local discharge, such as electromagnetic waves, ultrasonic waves, etc.

[0003] In order to ensure that the sensor can accurately and reliably monitor the local discharge phenomenon in power equipment and ensure the safe and stable operation of power equipment, the partial discharge sensor needs to be calibrated and maintained regularly. At present, a very high frequency (VHF) partial discharge calibrator is usually used to calibrate the partial discharge sensor in the prior art. However, it is found in the actual calibration process that the VHF partial discharge calibrator and the calibrated partial discharge sensor are usually exposed on the operation table, and during the calibration process, they are easily affected by electrostatic interference in the external environment and electromagnetic interference generated by the alternating electric field, which affects the calibration result and causes errors in the calibration of the partial discharge sensor. For this reason, this application proposes a partial discharge sensor calibration device. Summary of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide a partial discharge sensor calibration device, aiming to solve the technical problem that in the prior art, the partial discharge calibrator and the partial discharge sensor during the calibration process are exposed on the operation table, and are easily affected by electrostatic interference in the external environment and electromagnetic interference generated by the alternating electric field, which affects the calibration result and causes errors in the calibration of the partial discharge sensor.

[0005] Technical Solution

[0006] To solve the above technical problem, the utility model provides a partial discharge sensor calibration device, which includes a calibration table, on which a partial discharge calibrator is arranged. A shielding cover is also arranged on the calibration table. Electrostatic shielding layers are arranged inside the calibration table and the shielding cover wall. A conductive contact block for contacting the electrostatic shielding layer inside the shielding cover is arranged on the upper surface of the calibration table. A grounding rod for conducting the electrostatic shielding layer inside the calibration table to the ground is arranged at the bottom of the calibration table.

[0007] Preferably, one side of the shielding cover is hinged to the calibration table, and a handle is arranged on the outer wall of the shielding cover.

[0008] Preferably, a support plate is horizontally fixed on the side wall of the calibration table towards the hinged end of the shielding cover, and counterweights are arranged at both ends of the bottom of the calibration table.

[0009] Preferably, side plates are vertically arranged at both ends of the bottom of the calibration table. Ear plates are arranged at the bottom ends of the side plates, and mounting holes are formed in the ear plates.

[0010] Preferably, a cavity is formed at a position corresponding to the conductive contact block inside the calibration table. A push plate is movably arranged in the cavity. The bottom end of the conductive contact block penetrates through the electrostatic shielding layer and extends into the cavity to be connected with the push plate. The side wall of the conductive contact block is in contact with the electrostatic shielding layer. A first spring is vertically arranged between the push plate and the inner bottom wall of the cavity.

[0011] Preferably, a conductive elastic sheet is connected to the position of the electrostatic shielding layer corresponding to the conductive contact block. The conductive elastic sheet abuts against the side wall of the conductive contact block. The conductive contact block is in conductive contact with the electrostatic shielding layer through the conductive elastic sheet.

[0012] Preferably, at least two groups of grounding rods are provided. Each group of grounding rods includes a conductive sleeve vertically fixed at the bottom of the calibration table, a conductive inner rod movably penetrating through the bottom end of the conductive sleeve, a conductive slider movably embedded in the conductive sleeve, a second spring arranged between the conductive slider and the inner top wall of the conductive sleeve, and a conductive bottom plate fixed at the bottom end of the conductive inner rod. One end of the conductive inner rod extending into the conductive sleeve is connected to the conductive slider. The conductive slider is in sliding fit with the inner wall of the conductive sleeve. The top end of the conductive sleeve is connected to the electrostatic shielding layer inside the calibration table.

[0013] Beneficial effects

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] By means of the electrostatic shielding layer arranged in the calibration table and the shielding cover, during the calibration process of the partial discharge sensor device on the calibration table by using the partial discharge calibrator, the shielding cover is rotated to cover the calibration table, and the partial discharge sensor device and the partial discharge calibrator are covered inside. At this time, by using the elastic force of the first spring, the conductive contact block is in elastic contact with the electrostatic shielding layer on the shielding cover, and the conductive contact block is in elastic contact with the electrostatic shielding layer on the calibration table through the conductive elastic sheet. Thus, the electrostatic shielding layers on the calibration table and the shielding cover form a closed electrostatic shielding shell. In addition, the elastic force of the second spring pushes the conductive inner rod to make the conductive bottom plate abut against the ground. Through the connection between the conductive sleeve and the electrostatic shielding layer on the calibration table, the closed electrostatic shielding shell is grounded. The partial discharge sensor device and the partial discharge calibrator are placed in the grounded and closed electrostatic shielding shell, which can effectively prevent electrostatic interference and alternating electric field interference in the external environment, thereby ensuring the accurate and effective calibration result of the partial discharge sensor device. Description of the drawings

[0016] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 Schematic diagram of the overall structure of the present utility model;

[0018] Figure 2 For the present utility model Figure 1 Enlarged view of part A in;

[0019] Figure 3 Schematic diagram of the installation structure of the conductive contact block in the present utility model;

[0020] Figure 4 Schematic diagram of the structure of the grounding rod in the present utility model.

[0021] The reference signs in the drawings are: 1, calibration table; 2, shielding cover; 3, partial discharge calibrator; 4, conductive contact block; 5, grounding rod; 6, side plate; 7, ear plate; 8, counterweight; 9, partial discharge sensor device; 10, handle; 11, support plate; 12, electrostatic shielding layer; 13, cavity; 14, push plate; 15, conductive elastic sheet; 16, first spring; 17, conductive sleeve; 18, conductive inner rod; 19, conductive slider; 20, second spring; 21, conductive bottom plate. Detailed implementation manners

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than 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 efforts shall fall within the protection scope of the present utility model.

[0023] This embodiment provides a partial discharge sensor calibration device, and its structural schematic diagram is as Figures 1-4As shown in the figure, it includes a calibration table 1, on which a partial discharge calibrator 3 is arranged. A shielding cover 2 is also arranged over the calibration table 1. Electrostatic shielding layers 12 are arranged inside the walls of both the calibration table 1 and the shielding cover 2. A conductive contact block 4 for contacting the electrostatic shielding layer 12 inside the shielding cover 2 is arranged on the upper surface of the calibration table 1. A grounding rod 5 for connecting the electrostatic shielding layer 12 inside the calibration table 1 to the ground is arranged at the bottom of the calibration table 1. In this structural manner, the partial discharge sensor device 9 is placed on the calibration table 1 and is connected to the partial discharge calibrator 3 in terms of circuitry. Calibration parameters are set, and the partial discharge calibrator 3 applies a UHF calibration signal towards the partial discharge sensor device 9. The output data of the sensor when receiving the calibration signal is recorded, and the output data of the sensor is compared with the standard data of the calibrator to calculate the error value. Parameters such as the gain and bias of the sensor are adjusted according to the error value to achieve the calibration of the partial discharge sensor device 9. Since using the partial discharge calibrator 3 to calibrate the partial discharge sensor device 9 belongs to the prior art and is a commonly used technical means by those skilled in the art, the working principle of the partial discharge calibrator 3 will not be elaborated here. During the calibration process, the shielding cover 2 is placed over the calibration table 1. The electrostatic shielding layers 12 inside the calibration table 1 and the shielding cover 2 are conductively connected through the conductive contact block 4, and the electrostatic shielding layer 12 on the calibration table 1 is grounded through the grounding rod 5. Thus, the electrostatic shielding layers 12 inside the calibration table 1 and the shielding cover 2 form a grounded and closed electrostatic shielding shell. The partial discharge sensor device 9 and the partial discharge calibrator 3 are placed inside this grounded and closed electrostatic shielding shell, which can effectively prevent electrostatic interference and alternating electric field interference in the external environment, thereby ensuring the accuracy and effectiveness of the calibration result of the partial discharge sensor device 9.

[0024] In this embodiment, one side of the shielding cover 2 is hinged to the calibration table 1. A handle 10 is arranged on the outer wall of the shielding cover 2, which is convenient for the rotational opening and closing of the shielding cover 2. A support plate 11 is horizontally fixed on the side wall of the calibration table 1 towards the hinged end of the shielding cover 2 for placing the shielding cover 2 after it is opened. Counterweight blocks 8 are arranged at both ends of the bottom of the calibration table 1 to improve the overall stability of the calibration table 1. Side plates 6 are vertically arranged at both ends of the bottom of the calibration table 1. An ear plate 7 is arranged at the bottom end of the side plate 6, and an installation hole is opened on the ear plate 7 for fixing the calibration table 1.

[0025] As a preferred technical solution in this embodiment, a cavity 13 is formed at a position corresponding to the conductive contact block 4 inside the calibration table 1. A push plate 14 is movably arranged in the cavity 13. The bottom end of the conductive contact block 4 penetrates through the electrostatic shielding layer 12 and extends into the cavity 13 to be connected with the push plate 14, and the side wall of the conductive contact block 4 is in contact with the electrostatic shielding layer 12. A first spring 16 is vertically arranged between the push plate 14 and the inner bottom wall of the cavity 13. In this structural manner, after the shielding cover 2 rotates and covers the calibration table 1, the elastic force of the first spring 16 can push the conductive contact block 4 to elastically contact the electrostatic shielding layer 12 on the shielding cover 2. In addition, a conductive elastic sheet 15 is connected to the position of the electrostatic shielding layer 12 corresponding to the conductive contact block 4, and the conductive elastic sheet 15 abuts against the side wall of the conductive contact block 4. The conductive contact block 4 is conductively contacted with the electrostatic shielding layer 12 through the conductive elastic sheet 15. Thus, it is ensured that the electrostatic shielding layers 12 in the calibration table 1 and the shielding cover 2 can be conductively connected.

[0026] As a preferred technical solution in this embodiment, at least two groups of grounding rods 5 are provided. Each group of grounding rods 5 includes a conductive sleeve 17 vertically fixed at the bottom of the calibration table 1, a conductive inner rod 18 movably penetrating through the bottom end of the conductive sleeve 17, a conductive slider 19 movably embedded in the conductive sleeve 17, a second spring 20 arranged between the conductive slider 19 and the inner top wall of the conductive sleeve 17, and a conductive bottom plate 21 fixed at the bottom end of the conductive inner rod 18. One end of the conductive inner rod 18 extending into the conductive sleeve 17 is connected to the conductive slider 19, and the conductive slider 19 is in sliding fit with the inner wall of the conductive sleeve 17. The top end of the conductive sleeve 17 is connected to the electrostatic shielding layer 12 inside the calibration table 1. After the calibration table 1 is stably placed on the ground, the elastic force of the second spring 20 pushes the conductive inner rod 18 to make the conductive bottom plate 21 abut against the ground. At this time, the electrostatic shielding layer 12 inside the calibration table 1 is conducted to the ground through the contact of the conductive sleeve 17, the conductive slider 19, the conductive inner rod 18, and the conductive bottom plate 21, achieving the purpose of grounding the electrostatic shielding shell formed by the electrostatic shielding layers 12 in the calibration table 1 and the shielding cover 2.

[0027] Furthermore, in the above embodiment, the materials used for the electrostatic shielding layer 12, the conductive contact block 4, the conductive elastic sheet 15, the conductive sleeve 17, the conductive inner rod 18, the conductive slider 19, and the conductive bottom plate 21 include but are not limited to metals with good wire performance such as copper and aluminum.

[0028] Working principle: During use, the partial discharge sensor device 9 is placed on the calibration table 1 and connected to the partial discharge calibrator 3 in line. The calibration parameters are set, and the partial discharge calibrator 3 applies a UHF calibration signal towards the partial discharge sensor device 9. The output data of the sensor when receiving the calibration signal is recorded, and the output data of the sensor is compared with the standard data of the calibrator to calculate the error value. The parameters such as the gain and bias of the sensor are adjusted according to the error value to achieve the calibration of the partial discharge sensor device 9. Further, during the calibration process of the partial discharge sensor device 9, the rotating shielding cover 2 is closed on the calibration table 1 to cover the partial discharge sensor device 9 and the partial discharge calibrator 3 inside. Under the elastic force of the first spring 16, the conductive contact block 4 is in elastic contact with the electrostatic shielding layer 12 on the shielding cover 2, and the conductive contact block 4 is in elastic contact with the electrostatic shielding layer 12 on the calibration table 1 through the conductive elastic sheet 15. Thus, the electrostatic shielding layers 12 on the calibration table 1 and the shielding cover 2 form a closed electrostatic shielding housing. Additionally, the elastic force of the second spring 20 pushes the conductive inner rod 18 to make the conductive bottom plate 21 contact the ground. Through the connection of the conductive sleeve 17 to the electrostatic shielding layer 12 on the calibration table 1, the closed electrostatic shielding housing is grounded. The partial discharge sensor device 9 and the partial discharge calibrator 3 are placed inside the grounded and closed electrostatic shielding housing, which can effectively prevent electrostatic interference and alternating electric field interference in the external environment and ensure the accuracy and effectiveness of the calibration result of the partial discharge sensor device 9.

[0029] All technical features in this embodiment can be freely combined according to actual needs.

[0030] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A partial discharge sensor calibration device, comprising a calibration platform (1), characterized in that: The calibration platform (1) is provided with a partial discharge calibrator (3), and the calibration platform (1) is also provided with a shielding cover (2). The calibration platform (1) and the shielding cover (2) are both provided with an electrostatic shielding layer (12) inside the cover wall. The upper surface of the calibration platform (1) is provided with a conductive contact block (4) for contacting the electrostatic shielding layer (12) inside the shielding cover (2), and the bottom of the calibration platform (1) is provided with a grounding rod (5) for conducting the electrostatic shielding layer (12) inside the calibration platform (1) and the ground.

2. A partial discharge sensor calibration device according to claim 1, characterized in that: One side of the shielding cover (2) is hinged to the calibration platform (1), and a handle (10) is provided on the outer wall of the shielding cover (2).

3. A partial discharge sensor calibration device according to claim 2, characterized in that: A support plate (11) is horizontally fixed on the side wall of the calibration platform (1) at one hinged end facing the shielding cover (2), and counterweight blocks (8) are provided at both ends of the bottom of the calibration platform (1).

4. A partial discharge sensor calibration device according to claim 1, characterized in that: Side panels (6) are vertically arranged at both ends of the bottom of the calibration platform (1), and ear panels (7) are arranged at the bottom ends of the side panels (6), and mounting holes are opened on the ear panels (7).

5. The partial discharge sensor calibration device according to claim 1, characterized in that: A cavity (13) is provided at a position corresponding to the conductive contact block (4) in the calibration platform (1), a push plate (14) is movably arranged in the cavity (13), the bottom end of the conductive contact block (4) penetrates the electrostatic shielding layer (12) and extends into the cavity (13) to be connected with the push plate (14), and the side wall of the conductive contact block (4) is in contact with the electrostatic shielding layer (12), and a first spring (16) is vertically arranged between the push plate (14) and the bottom wall inside the cavity (13).

6. A partial discharge sensor calibration device according to claim 5, characterized in that: A conductive spring sheet (15) is connected to the electrostatic shielding layer (12) at positions corresponding to the conductive contact block (4); the conductive spring sheet (15) contacts the side wall of the conductive contact block (4); and the conductive contact block (4) is in conductive contact with the electrostatic shielding layer (12) via the conductive spring sheet (15).

7. The partial discharge sensor calibration device according to claim 1, characterized in that: At least two groups of grounding rods (5) are provided, and each group of grounding rods (5) comprises a conductive sleeve (17) vertically fixed at the bottom of the calibration platform (1), a conductive inner rod (18) movably inserted into the bottom end of the conductive sleeve (17), a conductive slider (19) movably embedded in the conductive sleeve (17), a second spring (20) provided between the conductive slider (19) and the inner top wall of the conductive sleeve (17), and a conductive bottom plate (21) fixed to the bottom end of the conductive inner rod (18), one end of the conductive inner rod (18) extending into the conductive sleeve (17) is connected to the conductive slider (19), the conductive slider (19) is slidably fitted with the inner wall of the conductive sleeve (17), and the top end of the conductive sleeve (17) is connected to the electrostatic shielding layer (12) in the calibration platform (1).

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