【摘要】 对开关分断操作引起的电快速瞬变脉冲群(EFT/B)骚扰信号的时域和频域特性进行研究。分析了开关分断操作时电感中的电流对杂散电容充电引起EFT/B骚扰的过程,采用电力系统电磁暂态仿真软件ATP仿真电力系统一次回路中开断空载变压器和空载长线时形成的EFT/B骚扰。采取金属氧化物避雷器(MOV)保护、RC保护和选相分闸等防护措施可抑制开关分断操作引起的EFT/B骚扰的幅值,减小EFT/B骚扰的振荡频率。更多还原

【Abstract】 The time-domain and frequency-domain characteristics of EFT /B(Electrical Fast Transient /Burst) caused by switch operations are studied.The EFT /B generation process is analyzed:the current of inductors during switch-open operation charges the parasitic capacitance,which is simulated for no-load transformer trip and no-load long transmission line trip using the electromagnetic transient simulation software ATP.Countermeasures,such as MOV(Metal Oxide Varistor),RC protection and selected phase-trip,may suppress the EFT /B caused by trip operation and lower its frequency.更多还原