Static Voltage Sharing Design of a Sextuple-Break 363 kV Vacuum Circuit Breaker

Xiao Yu, Fan Yang, Xing Li, Shaogui Ai, Yongning Huang, Yiping Fan and Wei Du
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Xiao Yu: State Key Laboratory of Power Transmission Equipment & System Security and New Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, China
Fan Yang: State Key Laboratory of Power Transmission Equipment & System Security and New Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, China
Xing Li: State Key Laboratory of Power Transmission Equipment & System Security and New Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, China
Shaogui Ai: Electric Power Research Institute of Ningxia Electric Power Company of State Grid Corporation of China, Yinchuan 750001, China
Yongning Huang: Electric Power Research Institute of Ningxia Electric Power Company of State Grid Corporation of China, Yinchuan 750001, China
Yiping Fan: Electric Power Research Institute of Ningxia Electric Power Company of State Grid Corporation of China, Yinchuan 750001, China
Wei Du: Wuhan NARI Limited Company of State Grid Electric Power Research Institute, Wuhan 430074, China

Energies, 2019, vol. 12, issue 13, 1-12

Abstract: A balanced voltage distribution for each break is required for normal operation of a multi-break vacuum circuit breaker (VCB) This paper presented a novel 363 kV/5000 A/63 kA sextuple-break VCB with a series-parallel structure. To determine the static voltage distribution of each break, a 3D finite element method (FEM) model was established to calculate the voltage distribution and the electric field of each break at the fully open state. Our results showed that the applied voltage was unevenly distributed at each break, and that the first break shared the most voltage, about 86.3%. The maximum electric field of the first break was 18.9 kV/mm, which contributed to the reduction of the breaking capacity. The distributed and stray capacitance parameters of the proposed structure were calculated based on the FEM model. According to the distributed capacitance parameters, the equivalent circuit simulation model of the static voltage distribution of this 363 kV VCB was established in PSCAD. Subsequently, the influence of the grading capacitor on the voltage distribution of each break was investigated, and the best value of the grading capacitors for the 363 kV sextuple-break VCB was confirmed to be 10 nF. Finally, the breaking tests of a single-phase unit was conducted both in a minor loop and a major loop. The 363 kV VCB prototype broke both the 63 kA and the 80 kA short circuit currents successfully, which confirmed the validity of the voltage sharing design.

Keywords: vacuum circuit breaker; multi-break; voltage distribution; FEM; stray capacitance; grading capacitor (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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