High-voltage electric appliance partial discharge and micro water density composite sensor

Abstract

The utility model provides a high-voltage electric appliance partial discharge and micro-water density composite sensor which comprises an ultrahigh-frequency signal receiving antenna, an installation cover plate and a plurality of gas measurement sensor units. The ultrahigh-frequency signal receiving antenna is connected with the sensing signal processing board through an insulating block fixed on the mounting cover plate and an ultrahigh-frequency signal connector, and the plurality of gas measurement sensor units arranged on the mounting cover plate are connected with the sensing signal processing board through gas measurement sensor connecting wires, and a gas measurement sensor connecting line is embedded in the mounting cover plate and penetrates through the insulating block to be connected with the sensing signal processing plate below. According to the utility model, the function of integrating high-voltage electric appliance partial discharge measurement and SF6 gas state measurement is realized, the installation structure of the original partial discharge sensor is not changed, and the construction is convenient; the gas measurement sensor unit is directly contacted with gas in the gas chamber, so that the density and micro-water of the gas can be accurately measured in real time; a plurality of gas state measurement sensing units can prolong the service life of the gas state measurement sensing units through a main / standby switching operation mode, and the gas state measurement sensing units are compared with one another to achieve the purpose of calibration.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of electric power detection equipment, concretely relates to a high voltage electrical apparatus partial discharge and micro water density composite sensor. BACKGROUND

[0002] Current monitoring of high voltage electrical apparatus such as GIS mainly has two kinds, partial discharge monitoring of ultra-high frequency and SF6 gas density and micro water monitoring, two kinds of monitoring methods have different emphasis and different detection means, partial discharge monitoring of ultra-high frequency mainly monitors the situation of partial discharge in the ultra-high frequency band to reflect its insulation performance, and SF6 gas monitoring mainly monitors the density and moisture content of SF6 gas in the equipment cavity to reflect its sealing performance and insulation medium situation.

[0003] These two kinds of monitoring are very important for high voltage electrical apparatus, and also have relevance. Currently, people usually adopt two separate systems, a partial discharge monitoring system of ultra-high frequency and an SF6 gas density and micro water monitoring system, and the sensors are also independent, using an ultra-high frequency sensor and an SF6 gas density and micro water sensor respectively. The existing method has the following problems: first, the SF6 gas in the gas chamber needs to be led to the sensor end, which leads to inaccurate measurement due to insufficient gas flow; second, it causes waste of resources and brings inconvenience in installation and maintenance; third, it needs to provide two kinds of sensor interfaces on the equipment, which increases the safety hazard, such as the increase of gas leakage hidden trouble points caused by the increase of joints, and the existence of user electrical safety hidden trouble caused by the increase of cables.

[0004] The utility model discloses a kind of about GIL partial discharge and insulation gas detection sensor, discloses a kind of about GIL partial discharge and insulation gas detection sensor, including GIL pipeline, the GIL pipeline one side is processed with opening, the opening inside installation GIL sensor flange, the GIL sensor flange is equipped with acoustic-electric partial discharge detection, insulation gas comprehensive detection integrated sensor, the acoustic-electric partial discharge detection, insulation gas comprehensive detection integrated sensor includes ultra-high frequency sensor, ultrasonic sensor, density sensor, micro water sensor, temperature sensor and pressure sensor, the GIL sensor flange flange middle position is fixed with ultra-high frequency sensor.This sensor is with micro water, density, pressure and temperature insulation gas comprehensive detection scheme, integrates and packages partial discharge detection and insulation gas detection in a sensor, adopts opening type built-in installation, with better detection effect, detection gas data is more real.The middle position of the ultra-high frequency sensor is connected with ultrasonic sensor, density sensor, micro water sensor, temperature sensor and pressure sensor by ceramic fiber transmission component lead wire to the periphery, and the ultrasonic sensor, density sensor, micro water sensor, temperature sensor and pressure sensor are distributed around the ultra-high frequency sensor.

[0005] CN209132373U discloses a kind of very high frequency partial discharge and SF6 gas density integrated sensor, discloses a kind of very high frequency partial discharge and SF6 gas density integrated sensor, including control box, flange, sensor solid seal box, very high frequency sensor, pressure sensor, temperature sensor, coaxial cable, antenna, pressure and temperature sensor are fixedly placed in flange, pressure sensor end surface is exposed and sealed with O type sealing ring, pressure, temperature, very high frequency sensor are all fixed in sensor solid seal box by epoxy resin and are connected to control box, very high frequency partial discharge signal is transmitted to monitoring host computer by coaxial cable, control box can collect the information collected by temperature sensor, pressure sensor in real time, corresponding SF6 gas density is calculated and uploaded to monitoring host computer.The integrated sensor of the utility model is packaged on the same flange plate, provides very high frequency partial discharge signal and gas density, saves half of sensor interface and reduces the number of field construction cable, with simple installation, less maintenance, economic saving and other advantages.

[0006] But the above two kinds of schemes are not described in detail for the arrangement structure, connection mode, number of configuration, life management of single function sensor inside integrated sensor, and the implementability is insufficient.Further, the above two kinds of schemes do not explain the power supply of sensor, signal transmission mode, etc.;The arrangement structure, connection and maintenance mode of sensor are not detailed.;The scheme of electronic components with shorter service life compared to the device body and the same service life as the device is not described. Utility model content

[0007] The utility model discloses a kind of high voltage apparatus partial discharge and micro water density composite sensor, to overcome the technical problem that the implementability of the arrangement structure, connection mode, number of configuration, prolong service life measures of each single function sensor when existing technology high voltage apparatus partial discharge measurement and SF6 gas state measurement structure integration is not accurate.

[0008] To solve the above technical problems, the utility model adopts the following technical solutions:

[0009] A kind of high voltage apparatus partial discharge and micro water density composite sensor, including installation cover plate, the center of the installation cover plate is provided with insulating block, one end of insulating block is connected with very high frequency signal receiving antenna, the other end of insulating block is connected with sensing signal processing board;

[0010] A plurality of gas measurement sensor units are also installed on the installation cover plate, and the gas measurement sensor units are connected to the sensing signal processing board through gas measurement sensor connecting lines, which are embedded in the installation cover plate and connected to the sensing signal processing board below through the insulating block;

[0011] The gas measurement sensor unit comprises a gas measurement sensor circuit board, and a pressure sensor and a temperature and humidity sensor are installed on the gas measurement sensor circuit board.

[0012] Further, the gas measurement sensor unit further comprises a grid cover provided with gas holes, the grid cover covers the gas measurement sensor circuit board, and the grid cover is fixed on the mounting cover plate.

[0013] Further, the mounting cover plate is provided with through holes for the gas measurement sensor connecting wires to pass through.

[0014] Further, the mounting cover plate is provided with a wire slot, and the wire slot is filled with epoxy resin.

[0015] Further, the gas measurement sensor connecting wires are multi-core shielded cables composed of power supply wires, ground wires and communication signal wires, one end of the gas measurement sensor connecting wires is welded on the gas measurement sensor circuit board, and the other end of the gas measurement sensor connecting wires is connected to the sensing signal processing plate.

[0016] Further, the plurality of gas measurement sensor units are symmetrically arranged.

[0017] Further, the sensing signal processing plate is provided with a standard N-type connector and a 485 communication interface.

[0018] Further, the ultra-high frequency signal receiving antenna adopts a metal flat plate receiving antenna or a printed circuit board antenna.

[0019] Further, the ultra-high frequency signal receiving antenna and the sensing signal processing plate are connected through an ultra-high frequency signal connector, and the sensing signal processing plate is externally provided with a sensor junction box.

[0020] Further, the sensing signal processing plate and the ultra-high frequency signal connector are arranged in the sensor junction box.

[0021] Compared with the prior art, the utility model has the following beneficial technical effects:

[0022] The utility model provides a kind of high voltage apparatus partial discharge and micro water density composite sensor, including the insulating block fixed on mounting cover plate, ultra-high frequency signal receiving antenna is connected with sensing signal processing plate through insulating block and ultra-high frequency signal connector, and is connected with each gas measurement sensor unit through gas measurement sensor connecting wire and sensing signal processing plate, wherein, gas measurement sensor connecting wire is embedded in mounting cover plate and is connected with sensing signal processing plate below by passing through insulating block, the utility model realizes the function of integrating high voltage apparatus partial discharge measurement and SF6 gas state measurement, realizes the structure of not changing the original partial discharge sensor installation of high voltage apparatus, it is convenient to construct, and gas measurement sensor unit is directly contacted with gas in gas chamber, can real-time and accurately measure the density of gas, micro water.

[0023] The utility model discloses on the basis of traditional built-in partial discharge sensor, designs multiple gas state measurement sensor unit, arranges on partial discharge sensor metal cover plate, combines into the compound sensor that can measure partial discharge signal and can measure gas micro water, density, pressure. Multiple gas state measurement sensor unit can prolong the service life of gas state measurement sensor unit through the operation mode of main spare switching on one hand, reach the purpose of calibration on the other hand by mutual comparison. The compound sensor directly contacts the gas chamber, and the gas state measurement is more accurate, and at the same time, the structure of original partial discharge sensor installation of high voltage apparatus is not changed, which has the advantages of convenient construction and cost saving.

[0024] Preferably, a grid cover is arranged above the gas measurement sensor circuit board, which can fix the gas measurement sensor circuit board and prevent the components of the circuit board from falling into the inner cavity.

[0025] Preferably, the grid cover is provided with air holes, which can fully mix the sensor and the gas in the inner cavity, and ensure the measurement accuracy.

[0026] Preferably, the gas measurement sensor unit has multiple units, and the sensor can be switched on and off and switched between main and standby through a sensing signal processing board, which can increase the service life of the sensor unit. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a side view of a high-voltage apparatus partial discharge and micro water density compound sensor structure in the embodiment of the utility model;

[0028] Figure 2 is a top view of a gas measurement unit with one main and one standby structure in the embodiment of the utility model;

[0029] Figure 3 is a top view of a gas measurement unit with one main and three standby structures in the embodiment of the utility model;

[0030] Figure 4 is an installation structure diagram of the gas measurement unit in the sensor.

[0031] In the figure, 1 is a UHF signal receiving antenna; 2 is a first gas measurement sensor connecting structure; 3 is a first gas measurement sensor unit; 4 is a mounting cover plate; 5 is a sensor junction box; 6 is a sensing signal processing board; 7 is a second gas measurement sensor unit; 8 is a second gas measurement sensor connecting structure; 9 is an insulating block; 10 is a UHF signal connector; 11 is a grid cover; 12 is a gas measurement sensor connecting line; 13 is a gas measurement sensor circuit board; 14 is a pressure sensor; and 15 is a temperature and humidity sensor. DETAILED DESCRIPTION

[0032] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention 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 invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0033] Example 1

[0034] In one embodiment of this utility model, a composite sensor of high-voltage electrical partial discharge and micro-water density is provided, such as... Figure 1 As shown, the system includes an ultra-high frequency signal receiving antenna 1, multiple gas measurement sensor units, a mounting cover plate 4, a sensor signal processing board 6, and an insulating block 9. The insulating block 9 is located at the center of the mounting cover plate 4. The ultra-high frequency signal receiving antenna 1 passes through the insulating block 9 and is connected to the sensor signal processing board 6. The multiple gas measurement sensor units are located on the circumferential edge of the mounting cover plate 4. Each gas measurement sensor unit has the same internal structure, including a gas measurement sensor circuit board 13 and a pressure sensor 14 and a temperature and humidity sensor 15 mounted on the gas measurement sensor circuit board 13. One end of the gas measurement sensor connecting wire 12 is soldered to the gas measurement sensor circuit board 13. A portion of the gas measurement sensor connecting wire 12 is embedded in the wire groove of the mounting cover plate, and another portion is cast into the insulating block 9. The other end of the gas measurement sensor connecting wire 12 is connected to the sensor signal processing board 6.

[0035] Specifically, the gas measurement sensor connection line 12 is a multi-core shielded cable consisting of a power line, a ground line, and a communication signal line. The wire groove in the mounting cover plate 4 is filled with epoxy resin. A gas measurement sensor unit connection structure is also provided outside the gas measurement sensor connection line 12 to protect and fix the gas measurement sensor connection line 12.

[0036] The upper part of the insulating block 9 is connected to the UHF signal receiving antenna 1, and the lower part is connected to the sensing signal processing board 6 through the UHF signal connector 10. That is, the UHF signal receiving antenna 1 passes through the insulating block 9 and is connected to the sensing signal processing board 6 through the UHF signal connector 10.

[0037] In one embodiment of this utility model, based on the above structure, the gas measurement sensor unit further includes a grid cover 11 with ventilation holes. The grid cover 11 is disposed above the gas measurement sensor circuit board 13 and fixed on the mounting cover plate 4.

[0038] In another embodiment of the utility model, the ultra-high frequency signal receiving antenna 1, the gas measurement sensor unit and the insulating block 9 are all arranged on the same side of the mounting cover plate 4, the sensor signal processing plate 6 and the ultra-high frequency signal connector 10 are arranged on the other side of the mounting cover plate 4 where the sensor junction box 5 is arranged, and the sensor signal processing plate 6 and the ultra-high frequency signal connector 10 are arranged in the sensor junction box 5.

[0039] As an optional mode, as shown in Figure 2 The gas measurement sensor unit is 2 and is symmetrically arranged, wherein the first gas measurement sensor unit 3 is connected with the sensor signal processing plate 6 through the first gas measurement sensor connecting structure 2, and the second gas measurement sensor unit 7 is connected with the sensor signal processing plate 6 through the second gas measurement sensor connecting structure 8.

[0040] Another feasible mode is as shown in Figure 3 The gas measurement sensor unit is 4 and is symmetrically arranged, and is all connected with the sensor signal processing plate 6 through the gas measurement sensor connecting structure.

[0041] In still another embodiment of the utility model, a high-voltage electrical local discharge and micro-water density composite sensor is provided, the sensor is installed in the form of an embedded local discharge sensor, and the sensor is composed of an ultra-high frequency signal receiving antenna 1, a first gas measurement sensor unit connecting structure 2, a first gas measurement sensor unit 3, a mounting cover plate 4, a sensor junction box 5, a sensor signal processing plate 6, a second gas measurement sensor unit 7, a second gas measurement sensor unit connecting structure 8, an insulating block 9, an ultra-high frequency signal connector and the like. Among them: the number of ultra-high frequency signal receiving antennas is 1, and the gas measurement sensor unit and the connecting structure can be multiple.

[0042] The ultra-high frequency signal receiving antenna 1 is arranged in the central region of the mounting cover plate 4, and a plurality of gas measurement sensor units are symmetrically arranged on the mounting cover plate 4 plane around the ultra-high frequency signal receiving antenna 1. The related signal transmission lead is led out to the sensor signal processing plate 6 through the through hole in the center of the mounting cover plate 4 through the insulating block 9; the sensor signal processing plate 6 is arranged in the sensor junction box 5, and the sensor signal processing plate 6 is waterproof and dustproof in the sensor junction box 5.

[0043] The ultra-high frequency signal receiving antenna 1 is a metal flat plate receiving antenna or a printed circuit board antenna (including RF4 substrate or flexible substrate), such as a HILBERT fractal structure antenna, which is connected with the sensor signal processing plate 6 through the ultra-high frequency signal connector 10.

[0044] As Figure 4As shown, the gas measurement sensor unit mainly consists of a grid cover 11, a gas measurement sensor connection line 12, and a gas measurement sensor circuit board 13. A pressure sensor 14, a temperature and humidity sensor 15, and related auxiliary electronic components are soldered onto the gas measurement sensor circuit board 13 to achieve the measurement of absolute pressure, temperature, and humidity within the cavity, and an I2C or SPI communication interface is provided. Both sensors are electronic chips.

[0045] The grid cover 11 has ventilation holes to fully mix with the gas inside the cavity. This serves two purposes: firstly, it secures the gas measurement sensor circuit board 13, and secondly, it prevents the circuit board components from falling into the high-voltage electrical appliance's gas chamber. The grid cover 11 is fixed to the mounting cover plate 4 with screws. The gas measurement sensor connecting wire 12 is embedded in the wire groove of the mounting cover plate 4, filled with epoxy resin, and pressed tightly by the edge of the grid cover 11.

[0046] The gas measurement sensor connection line 12 is a multi-core shielded cable consisting of power supply, ground, and communication signal lines. One end of the gas measurement sensor connection line 12 is soldered to the gas measurement sensor circuit board 13 and partially cast into the insulating block 9. The other end is connected to the sensor signal processing board 6.

[0047] The sensor signal processing board 6 has a gas measurement sensor unit acquisition and processing circuit. It periodically acquires the output signals of pressure, temperature and humidity sensors through I2C or SPI interface and calculates the gas pressure, density and trace moisture content.

[0048] The sensor signal processing board 6 features timed activation, master / slave switching, and master / slave data comparison and calibration functions for multiple gas measurement sensing units, ensuring accurate measurements and extending sensor lifespan. The sensor signal processing board 6 has a standard N-type connector for UHF signal conversion, allowing the partial discharge processing device to acquire signals. The sensor signal processing board 6 also has a 485 communication interface, enabling the output of gas pressure, density, and trace moisture content data.

[0049] Specific measures to extend sensor lifespan include:

[0050] Timed activation: The sensor signal processing board activates and collects data for 6 pairs of sensor units at set intervals, and then shuts off the power after the data collection is completed. This greatly reduces the sensor's operating time and increases its service life.

[0051] Primary / standby switching: One primary and multiple standby sensor units can work in rotation, such as the primary unit working for one year and the standby unit working for one year. This can reduce the working time of the sensor units and increase their overall service life.

[0052] Primary and backup data calibration function: The primary and backup sensors are turned on simultaneously once a period of time (e.g., once a day) to compare and calibrate the collected data.

[0053] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A high-voltage electrical apparatus partial discharge and micro-water density composite sensor, characterized by, The installation cover plate (4) is provided with an insulating block (9) in the center, one end of the insulating block (9) is connected with a UHF signal receiving antenna (1), and the other end of the insulating block (9) is connected with a sensing signal processing plate (6). A plurality of gas measurement sensor units are further installed on the installation cover plate (4) and are connected with the sensing signal processing plate (6) through gas measurement sensor connecting lines (12) which are embedded in the installation cover plate (4) and pass through the insulating block (9). The gas measurement sensor unit comprises a gas measurement sensor circuit board (13) on which a pressure sensor (14) and a temperature and humidity sensor (15) are installed.

2. The partial discharge and micro-water density combined sensor for high voltage electrical apparatus according to claim 1, characterized in that, The gas measurement sensor unit further comprises a grid cover (11) with gas permeable holes, the grid cover (11) covers the gas measurement sensor circuit board (13) and is fixed on the installation cover plate (4).

3. The partial discharge and water mist density sensor for high voltage electrical apparatus according to claim 1, wherein The installation cover plate (4) is provided with through holes for the gas measurement sensor connecting lines (12) to pass through.

4. The partial discharge and micro-water density combined sensor for high voltage electrical apparatus according to claim 1 or 3, characterized in that, The installation cover plate (4) is provided with a wire slot which is filled with epoxy resin.

5. The partial discharge and water mist density sensor for high voltage electrical apparatus according to claim 1, wherein The gas measurement sensor connecting lines (12) are multi-core shielded cables composed of power lines, ground lines and communication signal lines, one end of the gas measurement sensor connecting lines (12) is welded on the gas measurement sensor circuit board (13), and the other end is connected to the sensing signal processing plate (6).

6. The partial discharge and water mist density sensor for high voltage electrical apparatus according to claim 1, wherein The plurality of gas measurement sensor units are symmetrically arranged.

7. The partial discharge and water mist density sensor for high voltage electrical apparatus according to claim 1, wherein The sensing signal processing plate (6) is provided with a standard N-type connector and a 485 communication interface.

8. The partial discharge and water mist density sensor for high voltage electrical apparatus according to claim 1, wherein, The UHF signal receiving antenna (1) is a metal flat plate receiving antenna or a printed circuit board antenna.

9. The partial discharge and water mist density sensor for high voltage electrical apparatus according to claim 1, wherein, The UHF signal receiving antenna (1) and the sensing signal processing plate (6) are connected through a UHF signal connector (10), and the sensing signal processing plate (6) is externally provided with a sensor junction box (5).

10. The partial discharge and water mist density sensor for high voltage electrical apparatus according to claim 9, wherein, The sensing signal processing plate (6) and the UHF signal connector (10) are arranged in the sensor junction box (5).

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