【摘要】 随着同杆多回线路同塔架设的发展,不同电压等级线路并行的情况随之出现。同塔架设的各回线路之间同时存在线间互感,为了解决不同电压等级同塔架设线路的故障计算问题,本文利用传统的对称分量法,用标幺值制的算法,首先求解考虑互感后故障点的正序、负序、零序综合阻抗,然后求出故障点的各序电流,再通过求解综合阻抗的矩阵,求出流过各回线路的各序电流,最后可以得到故障情况下的各回线路的各相电流。由此完成了同杆四回线单回线路发生短路故障时的短路电流计算。EMTP仿真结果表明,该方法用于不同电压等级的同杆四回线的短路电流计算的误差不超过2%。更多还原

【Abstract】 With the development of multi-circuits transmission lines on single tower,multi-circuit lines of different voltage grades have already been applied in some power grids.However,inductance between multi-circuit lines of different voltage grades is a new problem to fault calculation.In this paper,both traditional symmetrical-component-method and per-unit value are employed to calculate fault current with mutual inductance between lines.With this method,single-line short-circuit fault calculation is addressed.To solve phase current of each line,integrated positive sequence,negative sequence and zero sequence impedance considering mutual inductance are calculated.And then sequence currents at fault point are calculated.Therefore,phase currents can be obtained through sequence current solved from an integrated matrix of resistance.The result of EMTP simulation indicates that the calculating error is less than 2%.更多还原