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Built-in ultrahigh frequency sensor for online detection of partial discharge of gas insulated switchgear

A gas-insulated combination, ultra-high-frequency sensor technology, applied in the direction of testing dielectric strength, etc., can solve the problems of sensor fault detection, inconvenient maintenance, easy coupling to power frequency signals, inability to disassemble, etc., to achieve simple structure and detection accuracy. High, the effect of preventing GIS accidents

Inactive Publication Date: 2013-06-26
CHONGQING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Capacitive voltage division is easily formed between the GIS high-voltage metal conductive rod and the microstrip antenna, and the microstrip antenna and the metal base plate, which is easy to be coupled to the power frequency signal or overvoltage signal, causing misjudgment
[0005] 2. The microstrip antenna is integrally cast with the metal patch and the dielectric layer, and cannot be disassembled, causing inconvenience to sensor fault detection and maintenance

Method used

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  • Built-in ultrahigh frequency sensor for online detection of partial discharge of gas insulated switchgear
  • Built-in ultrahigh frequency sensor for online detection of partial discharge of gas insulated switchgear
  • Built-in ultrahigh frequency sensor for online detection of partial discharge of gas insulated switchgear

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A built-in UHF sensor for on-line partial discharge monitoring of gas-insulated combined electrical appliances is mainly composed of a back plate 5, a sensor sealing cover 1, an antenna bearing pillar 2, a spiral microstrip antenna 3, and a signal transmission cable 4. Its characteristics are:

[0026] The material of the back plate 5 is duralumin. The back plate 5 is disc-shaped with an outer diameter of 500 mm and a thickness of 90 mm. At the center of the back plate 5 , a through hole with a diameter of 20 mm (ie, the signal transmission cable insertion hole 10 ) is provided for the passage of the signal transmission cable 4 . At the peripheral edge of the back plate 5, 10 screw holes with a diameter of 30 mm (ie back plate fixing holes 6) are uniformly arranged, and the back plate 5 is fixed through the ten back plate fixing holes 6 and bolts On the flange of the GIS being tested. On the disk of the back plate 5 , 8 screw holes with a diameter of 20mm (ie sensor ...

Embodiment 2

[0032] A built-in ultra-high frequency sensor for partial discharge on-line monitoring of gas-insulated combined electrical appliances, the same as in Example 1, wherein:

[0033] The material of the back plate 5 is aluminum alloy. The back plate 5 is disc-shaped with an outer diameter of 250 mm and a thickness of 45 mm. At the center of the back plate 5 , a through hole with a diameter of 10 mm (ie, the signal transmission cable insertion hole 10 ) is provided for the passage of the signal transmission cable 4 . At the peripheral edge of the back plate 5, 8 screw holes with a diameter of 15mm (ie, the back plate fixing holes 6) are uniformly arranged, and the back plate 5 is fixed through the eight back plate fixing holes 6 and bolts On the flange of the GIS being tested. On the disc of the back plate 5 , 6 screw holes with a diameter of 10 mm (ie sensor sealing cover installation holes 7 ) are evenly arranged at positions corresponding to the mounting holes on the sensor s...

Embodiment 3

[0038] A built-in ultra-high frequency sensor for partial discharge on-line monitoring of gas-insulated combined electrical appliances, the same as in Example 1, wherein:

[0039] The back plate 5 is disc-shaped with an outer diameter of 375 mm and a thickness of 60 mm. At the center of the back plate 5, a through hole with a diameter of 15 mm is provided. At the peripheral edge of the back plate 5, 9 screw holes with a diameter of 20mm are uniformly arranged. On the disk of the back plate 5 , 7 screw holes with a diameter of 15 mm (ie sensor sealing cover installation holes 7 ) are uniformly arranged at positions corresponding to the mounting holes on the sensor sealing cover 1 . In the inner side of the mounting hole 7 of the sensor sealing cover, a groove depth 6mm, groove width 6mm, and an inner groove 8 with an outer diameter of 165mm are set for placing a rubber sealing ring. On the inner side of the inner groove 8 , and on the outer side of the insertion hole 10 for t...

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Abstract

The invention relates to a built-in ultrahigh frequency sensor for online detection of partial discharge of a gas insulated switchgear, and belongs to the technical field of online detection technologies of the partial discharge inside electrical equipment. The built-in ultrahigh frequency sensor mainly comprises a back plate, a sensor sealed cover, an antenna bearing supporting support, a spiral microstrip antenna, and a signal transmission cable, etc. The built-in ultrahigh frequency sensor has a simple structure, is convenient to disassemble, can detect the partial discharge inside a GIS (gas insulated switchgear) online at real time, has strong anti-jamming capacity, high sensitivity, high detection accuracy and small size, and can guarantee that the GIS can operate safely and stably. The built-in ultrahigh frequency sensor can be widely used for the online detection of the partial discharge inside the electrical equipment, and especially suitable for the online detection of the partial discharge inside the GIS.

Description

technical field [0001] The invention belongs to the technical field of on-line monitoring of internal partial discharge of electrical equipment, and in particular relates to a structure of an ultra-high frequency sensor applied to on-line detection of internal partial discharge of a gas-insulated combined electrical appliance. Background technique [0002] Gas-insulated combined electrical appliances (GIS for short) have the advantages of compact structure, small footprint, safe and reliable operation, small maintenance workload, long maintenance cycle, etc., and are widely used in power plants and substations in power systems. However, in GIS, the defects caused by various reasons will gradually expand, and will cause partial discharge (PD for short) under the action of a strong electric field, and excite electromagnetic waves with a frequency up to several gigahertz (GHz). The continuous development of partial discharge inside the GIS will cause insulation breakdown, lead ...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 张晓星唐炬李松辽刘恒刘锦平
Owner CHONGQING UNIV