Lightning Multi-Tripping Accidents and Flashover Phases Distribution in 220 kV Double-Circuit Transmission Lines

doi:10.3969/j.issn.1000－7229.2014.01.010

Abstract

Abstract:

The multi-tripping accidents often occur in 220 kV double-circuit transmission lines under lightning, which has serious influence on the reliability of power system. Firstly, two lightning multi-tripping accidents that happened in Lishui and Ningbo were analyzed. Then, the model with considering grounding resistance, induced voltage component and other factors was built based on EMTP program. The simulation results show that it can realize the accurate reappearance of the four-phase flashover accident caused by the lightning current with-179 kA amplitude in Lishui Xianghe/Xiangmu line, as well as the three-phase flashover accident caused by the lightning current with-140 kA amplitude in Ningbo Xiaochang/Xiaozhou line. The lightning current amplitude and the phase of power frequency voltage can be good match with flashover phases, and their values derived from the model match the real data perfectly. Based on the simulation model, this paper further studied the flashover phase distribution law of multi-tripping accidents in 220 kV double-circuit transmission lines. The results show that the power frequency voltage is the key issue that decides the flashover phases of multi-tripping accidents.

Key words: double circuit transmission line, multi-tripping accidents, simulation reappearance, power frequency voltage, flashover phase distribution, lightning

SHI Jidong, DENG Xu, ZHOU Hao, SHEN Zhiheng, GONG Jiangang, JIANG Wendong. Lightning Multi-Tripping Accidents and Flashover Phases Distribution in 220 kV Double-Circuit Transmission Lines[J]. ELECTRIC POWER CONSTRUCTION, 2014, 35(1): 50-56.

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