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Three-phase modeling of 40.5-kV vacuum circuit breaker switching off shunt reactors and overvoltage suppression measure analysis
Electric Power Systems Research ( IF 3.9 ) Pub Date : 2021-02-03 , DOI: 10.1016/j.epsr.2021.107058
Yun Geng , Jinlong Dong , Xinggui Chen , Luyang Zhang , Jing Yan , Yingsan Geng , Jing Peng , Ke Wang

Shunt reactors are commonly used in substations to compensate the capacitive reactive power of electric power systems. When a vacuum circuit breaker (VCB) switches off shunt reactors, an overvoltage with high amplitude and high frequency (HF) is generated because of the current chopping and multireignition of the VCB. The objective of this paper is to build the 40.5 kV statistical VCB model, simulate the overvoltage caused by switching off shunt reactors in a 35 kV substation, and analyze the impact of five types of overvoltage suppression measures under identical VCB conditions and substations. The statistical VCB model is established in MATLAB/Simulink and verified by the field tests. Three basic factors are considered in this model: chopping current value, dielectric dynamic insulation strength and HF current quenching capability of the VCB. The simulation results show that the suppression effects in descending order are the phase-controlled VCB, adding surge arresters, adding RC snubbers, double-break VCB and increasing the cable length.



中文翻译:

40.5 kV真空断路器关断并联电抗器的三相建模和过压抑制措施分析

并联电抗器通常用于变电站,以补偿电力系统的容性无功功率。当真空断路器(VCB)关闭并联电抗器时,由于VCB的电流斩波和多次点火,会产生高振幅和高频(HF)的过电压。本文的目的是建立40.5 kV统计VCB模型,模拟在35 kV变电站中因关闭并联电抗器而引起的过电压,并分析在相同VCB条件和变电站下五种过压抑制措施的影响。VCB统计模型是在MATLAB / Simulink中建立的,并通过现场测试进行了验证。该模型考虑了三个基本因素:斩波电流值,介电动态绝缘强度和VCB的HF电流淬灭能力。

更新日期:2021-02-03
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