Breakdown accident analysis occurred in 750kV AC circuit breaker for filter banks in ±800kV UHVDC transmission system

IF 3.3 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

Electric Power Systems Research Pub Date : 2025-04-09 DOI:10.1016/j.epsr.2025.111670

Weirong Qian , Zhaojun Jiang , Ao Li , Xu Cai , Junbo Deng , Bo Niu , Feiyue Ma , Hui Ni

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引用次数: 0

Abstract

The circuit breaker is of vital importance to the operation of the ultra-high voltage direct current (UHVDC) power transmission systems. This paper analyzes a breakdown accident which occurred in 750 kV AC circuit breaker for filter banks during the power decline process of the Lingshao ±800 kV UHVDC transmission system. Combined with on-site internal inspection, fault recording analysis and electric field simulation, it reveals that the electric filed distorted by a falling fastening nut was the primary cause to the first insulation breakdown on the grid side of the circuit breaker. Subsequently, the deteriorated insulation performance resulted in the second breakdown on the load side of the circuit breaker. The two breakdown paths in the circuit breaker are identified and verified by electric field simulation and PSCAD transient simulation together. This paper can provide references for the subsequent accident analysis of circuit breakers with controlled switching device in UHVDC power transmission systems.

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±800kV特高压直流输电系统750kV滤波组交流断路器击穿事故分析

断路器对特高压直流输电系统的正常运行至关重要。分析了凌绍±800kv特高压直流输电系统在功率下降过程中发生的750kv滤波组交流断路器击穿事故。结合现场内部检查、故障记录分析和电场模拟分析，发现紧固螺母掉落造成的电场畸变是导致断路器电网侧首次绝缘击穿的主要原因。随后，绝缘性能的恶化导致断路器负载侧的第二次击穿。通过电场仿真和PSCAD暂态仿真，对断路器的两条击穿路径进行了识别和验证。本文可为特高压直流输电系统控制开关断路器的后续事故分析提供参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Electric Power Systems Research 工程技术-工程：电子与电气

CiteScore

7.50

自引率

17.90%

发文量

963

审稿时长

3.8 months

期刊介绍： Electric Power Systems Research is an international medium for the publication of original papers concerned with the generation, transmission, distribution and utilization of electrical energy. The journal aims at presenting important results of work in this field, whether in the form of applied research, development of new procedures or components, orginal application of existing knowledge or new designapproaches. The scope of Electric Power Systems Research is broad, encompassing all aspects of electric power systems. The following list of topics is not intended to be exhaustive, but rather to indicate topics that fall within the journal purview. • Generation techniques ranging from advances in conventional electromechanical methods, through nuclear power generation, to renewable energy generation. • Transmission, spanning the broad area from UHV (ac and dc) to network operation and protection, line routing and design. • Substation work: equipment design, protection and control systems. • Distribution techniques, equipment development, and smart grids. • The utilization area from energy efficiency to distributed load levelling techniques. • Systems studies including control techniques, planning, optimization methods, stability, security assessment and insulation coordination.