Testing device for propagation characteristic of electromagnetic wave in gas insulated switchgear and testing method therefor

Patent metadata

Field	Value
Publication number	US-9753079-B2
Application number	US-201314654532-A
Country	US
Kind code	B2
Filing date	Nov 14, 2013
Priority date	Jan 11, 2013
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

A testing device for propagation characteristic of electromagnetic wave in gas insulated switchgear includes an ultrahigh frequency signal generator, a GIS testing chamber, an emitting antenna and a receiving antenna which are provided inside the GIS testing chamber. A detachable disc insulator is provided between the emitting antenna and the receiving antenna. Both terminals of a GIS testing chamber are sealed by polyurethane wave-absorbing sponge; the ultrahigh frequency signal generator is connected with the emitting antenna, and the receiving antenna is connected with a oscilloscope. A guide rod which is fixed by the disc insulator is provided in the GIS testing chamber. The present invention is capable of achieving testing propagation characteristic of partial discharge ultrahigh frequency electromagnetic wave signal of a gas insulated switchgear in a laboratory, so as to master attenuation characteristics of the partial discharge ultrahigh frequency electromagnetic wave signal.

First claim

What is claimed is:

1. A testing device for propagation characteristic of electromagnetic wave in a gas insulated switchgear (GIS), comprising:
an ultrahigh frequency signal generator ( 1 ), a GIS testing chamber ( 3 ), an emitting antenna ( 2 ) and a receiving antenna ( 12 ) which are provided inside the GIS testing chamber ( 3 );
wherein a detachable disc insulator ( 9 ) is provided between the emitting antenna ( 2 ) and the receiving antenna ( 12 );
two terminals of the GIS are sealed by polyurethane wave-absorbing sponge ( 4 );
the ultrahigh frequency signal generator ( 1 ) is connected with the emitting antenna ( 2 );
the receiving antenna ( 12 ) is connected with an oscilloscope ( 11 ); and
a guide rod ( 5 ) is provided in the GIS testing chamber ( 3 ) and is fixed by the detachable disc insulator ( 9 ).

2. The testing device, as recited in claim 1 , wherein the GIS testing chamber ( 3 ) comprises two chamber sections which are connected by the disc insulator ( 9 ) in a middle portion of the GIS testing chamber ( 3 ) to form an integral chamber.

3. The testing device, as recited in claim 2 , wherein the two chamber sections are connected by the disc insulator ( 9 ) via a flange ( 8 ), a fixing bolt ( 6 ) and a fixing nut ( 7 ); and the disc insulator ( 9 ) and the flange ( 8 ) are sealed by a sealing ring ( 10 ) therebetween.

4. The testing device, as recited in claim 2 , wherein external ends of each of the two chambers are sealed by metal cover plates ( 13 ), and the polyurethane wave-absorbing sponge ( 4 ) is adhered on an internal side of the metal cover plates ( 13 ).

5. The testing device, as recited in claim 2 , wherein a valve ( 15 ) and a barometer ( 14 ) are respectively provided on each chamber section, wherein the valve ( 15 ) is for charging SF6 gas, and the barometer ( 14 ) is for measuring gas pressure.

6. The testing device, as recited in claim 1 , wherein the ultrahigh frequency signal generator ( 1 ) is a picosecond pulse generator.

7. The testing device, as recited in claim 1 , wherein both the emitting antenna ( 2 ) and the receiving antenna ( 12 ) adopts small sale Archimedean double spiral antenna.

8. A testing method for propagation characteristic of electromagnetic wave in a gas insulated switchgear (GIS), comprising following steps of:
step (1): replacing a disc insulator ( 9 ) between two chamber sections with a hollow cylinder and keeping a length of the chamber sections, wherein electromagnetic waves are not transmitted via the disc insulator ( 9 ), sending an ultrahigh frequency electromagnetic wave signal via an emitting antenna ( 2 ) and a partial discharge ultrahigh frequency signal generator ( 1 ), receiving an ultrahigh frequency electromagnetic wave signal via a receiving antenna ( 12 ) and an oscilloscope ( 11 ), so as to obtain electromagnetic wave signal without access to the disc insulator;
step (2): installing the disc insulator ( 9 ) and repeating a process in the step (1), receiving the receiving antenna ( 12 ) and the oscilloscope ( 11 ) to obtain electromagnetic wave signal passed through the disc insulator ( 9 ); and
step (3): respectively comparing time domain and frequency domain of the electromagnetic wave signal obtained in the step (1) with the time domain and the frequency domain with electromagnetic wave signal obtained in the step (2);
wherein the time domain of the electromagnetic wave signal comprising three characteristics of a maximum amplitude, an average amplitude and a signal energy; and
wherein to a frequency domain signal, a frequency distribution characteristic is compared;
obtaining influence of the disc insulator on propagation characteristic of the electromagnetic wave signal by comparing the time domain and the frequency domain, so as to obtain the propagation characteristic of the electromagnetic wave signal in the GIS.

Assignees

• State Grid Corp China
• State Grid Hubei Electric Power Res Inst
• China Electric Power Res Inst
• Xi' An Jiao-Tong Univeristy
• Univ Xian Jiaotong

Inventors

• Chen Jun
• Li Jinbin
• Lu Jun
• Liu Haiqiong
• Chen Min
• Wang Hao
• Bi Jiangang
• Yuan Shuai
• Yang Yuan
• Li Junhao
• Liang Jianfeng
• Li Yanming

Classifications

• H04B17/00

  Monitoring; Testing (of line transmission systems H04B3/46; arrangements for monitoring or testing transmission systems employing electromagnetic waves other than radio waves H04B10/07) · CPC title

• H01Q1/36

  Structural form of radiating elements, e.g. cone, spiral, umbrella; {Particular materials used therewith}(H01Q1/08, H01Q1/14 take precedence) · CPC title

• G01R31/1254 Primary

  of gas-insulated power appliances or vacuum gaps (testing switches G01R31/327; detecting electrical or mechanical defects in encased switchgear H02B13/065) · CPC title

• H01Q1/362

  for broadside radiating helical antennas · CPC title