【摘要】 推导出了基于贝瑞隆模型的差动判据在三相耦合线路区内故障时的故障相差流和非故障相差流表达式,并在此基础上,提出一种新的基于贝瑞隆模型的实用判据,新判据在区外故障时能完全补偿暂态和稳态电容电流,区内故障时灵敏度高、允许过渡电阻能力强。仿真结果表明分析正确、新判据可靠。更多还原

【Abstract】 A criterion of current differential protection of EHV transmission lines based on Bergeron model is proposed in Literature. This paper educes the criterion’s differential current expressions of fault-phase and nonfaulted-phase when internal fault occurs in three phase coupling lines. A new applied criterion of current differential protection based on Bergeron model is proposed, which can compensate steady capacitance current and transient capacitance current perfectly to external faults. Further more, it has high sensibility to internal faults that means it can response sensibly the earth fault via a high resistance. Simulation results show that the analysis is correct and the new criterion is reliable.更多还原