【摘要】 输电线路参数是影响潜供电流的主要因素之一,对于超高压长距离输电线路必须要考虑线路的分布参数特性。本文基于分布参数的超高压长线建立了单相弧光接地引起线路两端开断后潜供电流和恢复电压的动态模型,在相模变换的基础上,采用二次模变换的方法对潜供电流与恢复电压的稳态值进行了精确计算,分析了不同线路模型对潜供电流的影响,基于RTDS对采用不同输电线路模型时的潜供电流进行了仿真分析,仿真结果验证了理论分析的正确性。更多还原

【Abstract】 In the Extra High Voltage(EHV) transmission system,the transient single-phase to ground faults are the most frequent to occur.Even after the opening of breakers in the two sides of the fault line,an induced current still exists in the arc because of the electrostatic and the electromagnetic coupling from the other two sound phases.Along with the raise of the voltage grade,the influence of the secondary arc becomes more and more,and may probably lead to the failure of the re-closing if the secondary arc is not extinguished promptly.In this paper,the dynamic secondary arc model(including recovery voltage and the secondary arc current) in single-phase asymmetric breaking is established based on the distribution parameters of EHV long-line.The method of twice-mode transformation is adopted to calculate the steady-state value of the secondary arc current and recovery voltage.Furthermore,the affects of different overhead line models on the secondary arc current are also analyzed through the real time digital simulation.更多还原