Research on Security of Live Working on Compact 500 kV Transmission Line in Yunnan Power Grid

doi:10.11930/j.issn.1004-9649.2013.7.66.5

Abstract

Abstract: According to the characteristics of live working on 500 kV compact transmission lines in high altitude (less than 2 800 m) area of Yunnan Power Grid, a series of experiments have been carried out at outdoor proving ground of Kunming UHV Test & Research Base. On the basis of the calculation and analysis of switching overvoltage occurred in UHV transmission lines, the hazard rate of approach distance and complex gap of live working under the specific work position of various operation modes at high altitude area was acquired according to test results. This article proposes a novel method for determining the minimum approach distance of living work, which is based on the analysis of the variation tendency of hazard rate. This method clearly shows the relationship between hazard rate and distance, so that the optimization of verification mode for the distance of live working can be performed. The results show that it is safe and feasible to carry out live working on photogenic and lower phase conductor of 500 kV compact tangent towers in Yunnan Power Grid. Research results are able to provide reference to maintenance and live working on compact 500 kV transmission line in high altitude area.

Key words: live working, hazard rate, minimum approach distance, high altitude, compact transmission line

CLC Number:

TM85

ZHANG Wen-ying, DENG Hua, QIAN Jing, GAO Chao, GONG Ming-yi, PANG Feng. Research on Security of Live Working on Compact 500 kV Transmission Line in Yunnan Power Grid[J]. Electric Power, 2013, 46(7): 66-71.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.2013.7.66.5

https://www.electricpower.com.cn/EN/Y2013/V46/I7/66

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