IEC 62271-101:2017附录A畸变电流公式分析与讨论

Analysis and Discussion of the Distortion Current Formula in Appendix A of IEC 62271—101:2017

高压交流断路器合成试验标准《IEC 62271—101:2017高压开关设备和控制设备—第101部分:合成试验》附录A中论述了断路器在开断短路电流时,大电流阶段的畸变电流产生机理及表达式。文中应用线性电流叠加原理,理论上推导了电弧电压为恒值和线性增长时大电流阶段的畸变电流计算公式,并与IEC标准中给出的公式进行了对比分析,结果表明:电弧电压恒定时畸变电流的计算公式与IEC标准一致,电弧电压线性增长时IEC标准中畸变电流计算公式存在问题需要进行修正。文中的研究内容为大容量试验站执行合成试验时畸变电流的评估与计算提供了参考与依据。

In the case of circuit-breakers breaking the short-circuit current the mechanism and formulas of distortion current in high-current interval are discussed in appendix A of IEC 62271-101：2017 high-voltage switchgear and controlgear- Part 101 ：Synthetic testing. By applying the superposition principle of linear current, this paper theoreti- cally deduced the distortion current formulas in high-current interval with constant arc voltage and linearly rising arc voltage, and compares it with the formulas given in the IEC standard. The results show that the distortion current formulas of this paper is the same as the IEC standard when the arc voltage is constant, but the distortion current formulas of the IEC standard are in problem and need to be amended when the arc voltage is linearly rising. The research contents of this paper provide reference and basis for the evaluation and calculation current distortion of synthetic test in high power station.