# US 9,753,079 B2 · Testing device for propagation characteristic of electromagnetic wave in gas insulated switchgear and testing method therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,753,079 B2 - Document ID: US9753079B2 - Status: Granted - Kind: B2 - Application number: 14/654,532 - Filed: 2013-11-14 - Published: 2015-12-24 - Granted: 2017-09-05 - Earliest claimed: 2013-01-11 - Assignees: State Grid Hubei Electric Power Research Institute; China Electric Power Research Institute; Xi'an Jiaotong University; State Grid Corporation of China - Applicants: State Grid Corporation of China; State Grid Hubei Electric Power Research Institute; China Electric Power Research Institute; Xi' An Jiao-Tong Univeristy - Inventors: Jun Chen; Jinbin Li; Jun Lu; Haiqiong Liu; Min Chen; Hao Wang; Jiangang Bi; Shuai Yuan; Yuan Yang; Junhao Li; Jianfeng Liang; Yanming Li - Web page: https://patentgrep.com/patent/US9753079B2 ## CPC - G01R 31/1254: {of gas-insulated power appliances or vacuum gaps (testing switches G01R31/327; detecting electrical or mechanical defects in encased switchgear H02B13/065)} - H01Q 1/362: {for broadside radiating helical antennas} - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - H01Q: ANTENNAS, i.e. RADIO AERIALS (radiators or antennas for microwave heating H05B6/72) ## 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. ## Claims ### Claim 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). ### Claim 2 (depends on 1) 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. ### Claim 3 (depends on 2) 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. ### Claim 4 (depends on 2) 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). ### Claim 5 (depends on 2) 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. ### Claim 6 (depends on 1) The testing device, as recited in claim 1, wherein the ultrahigh frequency signal generator (1) is a picosecond pulse generator. ### Claim 7 (depends on 1) 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. ### Claim 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.