A Review of UHV AC GIL Ex-factory Test Technology

doi:10.11930/j.issn.1004-9649.202004008

Electric Power ›› 2020, Vol. 53 ›› Issue (12): 151-158.DOI: 10.11930/j.issn.1004-9649.202004008

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A Review of UHV AC GIL Ex-factory Test Technology

CHEN Shuang^1,2, LIU Yan², BIAN Chao¹, ZHANG Pengfei³, CUI Boyuan², CHEN Yun², XU Jiazhong⁴

1. State Grid Jiangsu Electric Power Company Maintenance Branch, Nanjing 211100, China;
2. China Electric Power Research Institute, Beijing 100192, China;
3. State Grid Corporation of China, Beijing 100031, China;
4. SDEE Hitachi High-Voltage Switchgear Co., Ltd., Jinan 250300, China

Received:2020-04-03 Revised:2020-04-19 Published:2020-12-16
Supported by:
This work is supported by Science and Technology Project of SGCC (Research on Technical Characteristics and Quality Control of UHV GIL Insulators, Expansion Joints and Plug-in Contacts, No.GYB11201801457).

Abstract

Abstract: Based on the application of UHV gas-insulated metal-enclosed transmission line(GIL)in the Sutong GIL Utility Tunnel Project, this paper firstly introduces the structural characteristics of UHV GIL, and analyzes its main technical parameters, type test and performance requirements for ex-factory test. And then a partial buckle dynamic vacuum positive-pressure helium leak detection method is proposed, which can effectively improve the efficiency of the UHV GIL gas sealing test. In addition, a four-station insulation test switching tool and a SF₆ gas-insulated tank-type impulse voltage generator that meets the requirements of the UHV GIL standard lightning impulse voltage withstand test are introduced. The time for ex-factory insulation test of the UHV GIL is reduced to 1/4 of the traditional method. The testing practice introduced in this paper can provide a reference for the large-scale application of GIL.

Key words: UHV GIL, Sutong project, helium leak detection, four-station insulation test, switching tool, standard lightning impulse

CHEN Shuang, LIU Yan, BIAN Chao, ZHANG Pengfei, CUI Boyuan, CHEN Yun, XU Jiazhong. A Review of UHV AC GIL Ex-factory Test Technology[J]. Electric Power, 2020, 53(12): 151-158.

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https://www.electricpower.com.cn/EN/Y2020/V53/I12/151

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A Review of UHV AC GIL Ex-factory Test Technology

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