Ultrahigh frequency partial discharge built-in sensor

Abstract

The utility model discloses an ultrahigh frequency partial discharge built-in sensor comprising an acquisition assembly and a receiving assembly which are connected, the acquisition assembly is arranged in a GIS, and the receiving assembly is arranged on the GIS and extends to the outside; the collecting assembly comprises a junction box and a detection component arranged in the junction box, and the junction box is connected with the receiving assembly in an attached mode. According to the utility model, the acquisition assembly and the receiving assembly are fixedly connected, and the sensor is installed in the GIS and is in sealed connection, so that partial discharge signals in the GIS can be acquired, smaller partial discharge events can be captured, and the sensitivity, accuracy and reliability of detection are improved; by adopting the passive design, the problem of possible interference on the operation of the secondary system of the transformer substation is avoided, the safety and the stability of the sensor are ensured, the current impact resistance of the sensor is remarkably improved, and the safety risk of operation and maintenance personnel in the operation process is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of partial discharge detection, in particular to an ultra-high frequency partial discharge built-in sensor. Background Art

[0002] Partial discharge is one of the important indicators for the degradation of the insulation performance of high-voltage power equipment. Traditional partial discharge detection methods have problems such as low detection sensitivity and susceptibility to external interference. With the increasing requirements of the power system for equipment reliability, higher requirements are put forward for partial discharge detection technology. As a key component of the detection system, the ultra-high frequency partial discharge sensor can receive electromagnetic waves with frequencies ranging from 300 MHz to 3000 MHz excited by partial discharge in high-voltage equipment and convert them into electrical signals for recording and processing.

[0003] However, the built-in sensors in the prior art have extremely high requirements for safety during the installation process, and under high-voltage field strength, some sensors may generate partial discharge, affecting the accuracy of detection and the safety of equipment. In addition, the power frequency grounding loop impedance of the existing sensors is relatively large, and the ability to resist pulsed current impact is limited, posing a potential safety hazard to the operation and maintenance personnel. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an ultra-high frequency partial discharge built-in sensor, which is used to solve the problems of complex installation structure of the partial discharge sensor and limited resistance to pulsed current impact.

[0005] The utility model adopts the following technical solutions to solve the technical problems:

[0006] An ultra-high frequency partial discharge built-in sensor includes a connected acquisition component and a receiving component. The acquisition component is arranged inside the GIS, and the receiving component is arranged on the GIS and extends to the outside.

[0007] The acquisition component includes a junction box and a detection component arranged in the junction box. Among them, the junction box is adhesively connected to the receiving component.

[0008] Preferably, the receiving component includes a cover plate, an antenna, a fixing ring, and an insulator. Among them, the junction box is arranged on one side surface of the cover plate, the insulator is arranged at the center of the other side of the cover plate opposite to the junction box and is connected through the fixing ring, and the antenna is arranged at the center of the insulator.

[0009] Preferably, the junction box includes an upper cover, a box body, and a box pad that are sequentially connected from top to bottom. The upper cover covers the box body, the box pad is arranged on the other side surface of the cover plate opposite to the insulator, the box body is arranged on the box pad, and the detection component is arranged in the box body and is connected to the antenna.

[0010] Preferably, the detection component includes: a UHF sensor, a overvoltage protector, and a connection joint; the UHF sensor is disposed inside the box body and passes through the box body to be connected to the antenna, the connection joint is connected to the UHF sensor, and the overvoltage protector is disposed on one side of the connection joint and connected to the connection joint.

[0011] Preferably, the detection component further includes: a waterproof joint and a waterproof plug; one end of the waterproof joint is disposed inside the box body and connected to the connection joint, and the other end is disposed outside the box body, and the waterproof plug is connected to the waterproof joint and disposed outside the box body.

[0012] Preferably, a waterproof hole for connecting to the waterproof joint is provided on the side surface of the box body.

[0013] Preferably, a pressure relief plug and a pressure relief hole are provided on the side surface of the box body, and the pressure relief hole is provided on the side surface adjacent to the waterproof joint.

[0014] Preferably, the cover plate is of a disc structure, and sealing holes are uniformly provided on the circumference of the cover plate.

[0015] By fixedly connecting the acquisition component and the receiving component, the sensor is installed in the GIS and hermetically connected, and is used to acquire partial discharge signals inside the GIS, which can capture more minute partial discharge events, improving the sensitivity, accuracy and reliability of detection; adopting a passive design, it avoids the problem of possible interference with the operation of the secondary system of the substation, ensures the safety and stability of the sensor, significantly improves the anti-current impact ability of the sensor, and reduces the safety risk of maintenance personnel during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic three-dimensional structure diagram of the present invention;

[0017] Figure 2 is a schematic structure diagram of the receiving component of the present invention;

[0018] Figure 3 is a schematic internal structure diagram of the acquisition component of the present invention;

[0019] The reference numerals in the drawings are denoted as: 1 - acquisition component; 2 - receiving component; 3 - junction box; 4 - detection component; 5 - cover plate; 6 - antenna; 7 - fixing ring; 8 - insulator; 9 - upper cover; 10 - box body; 11 - box gasket; 12 - UHF sensor; 13 - overvoltage protector; 14 - connection joint; 15 - waterproof joint; 16 - waterproof plug; 17 - waterproof hole; 18 - pressure relief plug; 19 - pressure relief hole; 20 - sealing hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The technical solution of the present utility model will be further described below in conjunction with embodiments and the accompanying drawings.

[0021] A very high frequency partial discharge built-in sensor is installed at the pot-type insulator 8 and the earthing knife earthing basin of GIS (non-fully metal shielded) to receive the transverse electric wave and transverse magnetic wave in GIS, and includes: a connected acquisition component 1 and a receiving component 2. The acquisition component 1 is arranged inside GIS and is used for detecting partial discharge signals. The receiving component 2 is arranged on GIS and extends to the outside, integrated with GIS, hermetically connected, and transmits partial discharge signals.

[0022] The acquisition component 1 includes: a junction box 3 and a detection member 4 arranged inside the junction box 3. Among them, the junction box 3 is attached to and fixed on the receiving component 2.

[0023] In a further implementation manner of this embodiment, the receiving component 2 includes: a cover plate 5, an antenna 6, a fixing ring 7, and an insulator 8. Among them, the junction box 3 is arranged on one side surface of the cover plate 5, the insulator 8 is arranged at the center of the other side of the cover plate 5 opposite to the junction box 3 and is connected through the fixing ring 7, and the antenna 6 is arranged at the center of the insulator 8.

[0024] In a further implementation manner of this embodiment, the junction box 3 includes: an upper cover 9, a box body 10, and a box gasket 11 connected in sequence from top to bottom. The upper cover 9 covers the box body 10, the box gasket 11 is arranged on the other side surface of the cover plate 5 opposite to the insulator 8, the box body 10 is arranged on the box gasket 11, and the detection member 4 is arranged inside the box body 10 and is connected to the antenna 6.

[0025] In a further implementation manner of this embodiment, the detection member 4 includes: a very high frequency sensor 12, a overvoltage protector 13, and a connection joint 14; the very high frequency sensor 12 is arranged inside the box body 10 and passes through the box body 10 to be connected to the antenna 6, the connection joint 14 is connected to the very high frequency sensor 12, and the overvoltage protector 13 is arranged on one side of the connection joint 14 and is connected to the connection joint 14. The effective working frequency band of the very high frequency sensor 12 is 300 - 1500 MHz, and it can detect most partial discharge signals with a size of ≥ 13 mm, up to 16 mm at most.

[0026] In a further implementation manner of this embodiment, the detection member 4 further includes: a waterproof joint 15 and a waterproof plug 16. One end of the waterproof joint 15 is arranged inside the box body 10 and is connected to the connection joint 14, and the other end is arranged outside the box body 10. The waterproof plug 16 is connected to the waterproof joint 15 and is arranged outside the box body 10.

[0027] In a further implementation manner of this embodiment, a waterproof hole 17 for connecting with the waterproof joint 15 is arranged on the side surface of the box body 10.

[0028] In a further embodiment of this example, a pressure relief plug 18 and a pressure relief hole 19 are provided on the side surface of the box body 10, and the pressure relief hole 19 is provided on the adjacent side surface of the waterproof connector 15.

[0029] In a further embodiment of this example, the cover plate 5 has a disc structure, and sealing holes 20 are uniformly arranged on the circumference of the cover plate 5. The sealing holes 20 are in threaded fit and are fixed on the GIS.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A UHF partial discharge built-in sensor, characterized in that: include: A connected collection component and a receiving component, wherein the collection component is arranged inside the GIS, and the receiving component is arranged on the GIS and extends to the outside; The collection component includes: a junction box and a detection component arranged in the junction box, wherein the junction box is fitted and connected to the receiving component.

2. The ultra-high frequency partial discharge built-in sensor according to claim 1, characterized in that: The receiving component includes: a cover plate, an antenna, a fixing ring and an insulator, wherein the junction box is arranged on one side of the cover plate, the insulator is arranged on the center of the other side of the cover plate relative to the junction box and is connected through the fixing ring, and the antenna is arranged at the center of the insulator.

3. The ultra-high frequency partial discharge built-in sensor according to claim 2, characterized in that: The junction box includes: an upper cover, a box body and a box gasket connected in sequence from top to bottom, the upper cover is arranged on the box body, the box gasket is arranged on the other side of the cover plate opposite to the insulator, the box body is arranged on the box gasket, and the detection component is arranged in the box body and connected to the antenna.

4. The ultra-high frequency partial discharge built-in sensor according to claim 3, characterized in that: The detection component includes: a UHF sensor, an overvoltage protector and a connecting joint; the UHF sensor is arranged in the box body and passes through the box body to be connected to the antenna, the connecting joint is connected to the UHF sensor, and the overvoltage protector is arranged on one side of the connecting joint and connected to the connecting joint.

5. The ultra-high frequency partial discharge built-in sensor according to claim 4, characterized in that: The detection component also includes: a waterproof joint and a waterproof plug, wherein one end of the waterproof joint is arranged inside the box body and connected to the connecting joint, and the other end is arranged outside the box body, and the waterproof plug is connected to the waterproof joint and arranged outside the box body.

6. The ultra-high frequency partial discharge built-in sensor according to claim 5, characterized in that: The side surface of the box body is provided with a waterproof hole for connecting with the waterproof joint.

7. The ultra-high frequency partial discharge built-in sensor according to claim 5, characterized in that: A pressure relief plug and a pressure relief hole are arranged on the side surface of the box body, and the pressure relief hole is arranged on the side surface adjacent to the waterproof joint.

8. The ultra-high frequency partial discharge built-in sensor according to claim 2, characterized in that: The cover plate is a disc structure, and sealing holes are evenly arranged on the circumference of the cover plate.

Images