The Minimum Effective Insulation Length of Insulating Tools for Live Working on ±1100 kV Grounding Electrode Lines

doi:10.11930/j.issn.1004-9649.202106065

Abstract

Abstract: The minimum effective length of insulating tools is an important parameter to ensure the safety of live working personnels, but there are no such provisions or references for live working on grounding electrode lines in existing standards or researches. In order to ensure the safety of live working on the grounding electrode lines, simulation is carried out on a ±1 100 kV grounding electrode line to obtain the maximum over-voltage and its waveform characteristics. AC, DC, and standard operating impulse discharge tests are conducted on typical insulating tools for live working, and the influence of test layout, types of insulating tools, and applying voltage types on the discharge voltage are analyzed. The results show that the DC discharge voltage is the lowest in the case of short insulating tools. Finally, based on the test results, fitting formula are proposed respectively for determing the AC, DC, and standard switching impulse discharge characteristics for short insulating tools. In addition, the minimum effective insulation length of insulating tools are proposed for live working on ±1 100 kV grounding electrode lines.

Key words: grounding electrode line, live working, insulating tools, discharge characteristics, minimum effective insulation length

LEI Xinglie, CHENG Dengfeng, CAO Songyuan, PENG Yong, XIA Lingzhi. The Minimum Effective Insulation Length of Insulating Tools for Live Working on ±1100 kV Grounding Electrode Lines[J]. Electric Power, 2022, 55(4): 117-122.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202106065

https://www.electricpower.com.cn/EN/Y2022/V55/I4/117

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