Identification Method for Incipient Intermittent Arc Ground Fault of High-Voltage Cables

doi:10.11930/j.issn.1004-9649.202004153

Abstract

Abstract: Persistence partial discharge accelerates aging of cable insulation, and the insulation defect point will produce an instantaneous intermittent grounding arc before its complete breakdown. For the incipient fault of this type of cables, a recognition strategy is proposed based on combination of change point detection and improved adaptive neural network under time domain sequence. Firstly, the non-parametric bilateral CUSUM algorithm is used to monitor the cumulative sum of the positive and negative offsets of the three-phase current to determine the abnormal phase. And then the improved ADAline weight formula is used to express the harmonic content of the transient abnormal phase, and the amplitude variation trend of harmonic content curves and its transient duration exceeding the set threshold can be used to identify the half-cycle and multi-cycle incipient faults of cables. The PSCAD / EMTDC simulation results show that the strategy has a good distinction for constant resistance faults or other overcurrent disturbances. Finally, the on-site monitoring data of live cables have verified the algorithm's fault recognition rate and anti-interference.

Key words: high-voltage cable, fault identification, incipient fault, change point detection, bilateral accumulation

ZHOU Zhengxiong, XIA Xiangyang, ZHU Peng, LI Mingde, HUANG Hai, CHEN Shanqiu, XIA Junshan, WANG Ruiqi. Identification Method for Incipient Intermittent Arc Ground Fault of High-Voltage Cables[J]. Electric Power, 2020, 53(12): 167-176.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202004153

https://www.electricpower.com.cn/EN/Y2020/V53/I12/167

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