阻容均压方式下双断口真空断路器预击穿特性研究  

Study on Pre-strike Characteristics of Double-break Vacuum Circuit Breaker with Grading Capacitance and Resistance

作　　者：王成龙 李洪伟 徐学帅 熊晓川 黄博 WANG Chenglong;LI Hongwei;XU Xueshuai;XIONG Xiaochuan;HUANG Bo(Puer Power Supply Company of Yunnan Power Grid Corporation,Yunnan Puer 665099,China)

机构地区：[1]云南电网有限责任公司普洱供电局,云南普洱665099

出　　处：《高压电器》2025年第3期27-41,共15页High Voltage Apparatus

基　　金：南网云南电网有限责任公司科技项目资助(050800KK52222038)。

摘　　要：双断口真空断路器能够充分利用短真空间隙的优异绝缘性能,显著降低容性电流开合过程中的重击穿概率,提高投切电容器组的性能。文中通过实验研究了双断口真空断路器采用阻容均压方式时的预击穿特性,包括预击穿电压、预击穿开距及其分散性,并计算其威布尔分布。研究结果表明,无论电压幅值如何,高压电阻都可以通过阻断从均压电容流向真空灭弧室的放电电流来延缓击穿过程,显著提升了双断口真空断路器的预击穿特性。对于串联电阻和桥接电阻两种阻容均压方式,桥接电阻可以减少电路中使用的电阻数量,降低断路器成本和体积,同时也有助于改善真空断路器在工作时的散热问题。文中的研究结果可以为阻容均压方式下降低双断口真空断路器关合的电气分散性角度和提高相控关合精度提供依据。The double-break vacuum circuit breaker can remarkably reduce the re-strike probability and improve the performance of switching the capacitor bank during capacitive current switching period by way of sufficiently using the perfect insulation performance of short vacuum gap.In this paper,the pre-strike characteristics,in including pre-strike voltage,pre-strike clearance and its dispersion of the double-break vacuum circuit breaker in the case of using grading capacitance and resistance,is studied by experiment and its Weibull distribution is calculated.The study result shows that no matter how the voltage amplitude is,the high-voltage resistance can mitigate the breakdown process by obstructing the discharge current flowing from the grading capacitor to the vacuum interrupter,and considerably enhance the pre-strike characteristics of the double-break vacuum circuit breaker.As for such two resistance and compactness grading modes as serial resistor and bridge resistor,the latter can reduce the number of resistors used in a circuit,thereby decreasing both cost and volume of the circuit breaker and,at the same time,helping to improve heat dissipation of the vacuum circuit breakers during operation.The study result presented in this paper can provide technical support for reducing the electrical dispersion angle and improving the phase-controlled making accuracy of the double-break vacuum circuit breaker.

关 键 词：双断口真空断路器 阻容均压 预击穿特性 相控关合 

分 类 号：TM561.2[电气工程—电器]