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| Suppression Effects of Circuit Breaker Characteristics on Switching Overvoltage of Cutting Shunt Reactor on 35kV No-Load Busbar |
| Zheng Yiming1, Xu Hua2, Jin Jiamin3, Liu Haojun1, Liu Shi1 |
1. State Grid Zhejiang Electric Power Research Institute Hangzhou 310014 China;
2. State Grid Zhejiang Electric Power Company Hangzhou 310007 China;
3. State Grid Zhejiang Power Company Ltd. Wenzhou Electric Power Supply Company Wenzhou 325028 China |
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Abstract When cutting shunt reactor on no-load busbar, the phenomena, such as current chopping, arc reignition and equivalent current chopping, are easy to occur during the switching process. The resulting overvoltage caused by the operations can cause phase-to-phase short-circuit of the related equipment and inter-turn insulation damage of the shunt reactor, which threatens the safety of electrical equipment. Equipment breakdowns caused by switching overvoltage of 35kV shunt reactor on no-load busbar in 220kV substation occur frequently, endangering the safe and stable operation of the power grid. In this paper, the mechanism, perniciousness and suppression of shunt reactor switching overvoltage were systematically analyzed. The suppression effects of circuit breaker characteristics and position on overvoltage were compared, and the overvoltage measurement and PSCAD simulation analysis were carried out, which provides solutions and engineering experience for the overvoltage suppression of 35kV shunt reactor on no-load busbar.
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Received: 21 September 2017
Published: 27 November 2018
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2018, Vol. 33 
