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对带并联电抗器线路发生瞬时性单相接地故障时跳开相的恢复电压特征进行了分析,应用拉普拉斯变换对恢复电压中的各种暂态分量进行了定量求解,从原理上揭示了恢复电压中衰减周期分量的产生原因。通过瞬时性故障与永久性故障时故障相端电压波形的对比,提出了识别永久性单相接地故障的跳开相端电压衰减周期分量幅值判据,并给出一种从跳开相端电压中提取低频衰减周期分量幅值的实用方法,该方法计算简单,判定迅速准确,且不受过渡电阻影响,可有效应用于带并联电抗器的超高压输电线路单相自适应重合闸故障性质的识别及重合时刻的选择。
The characteristics of the recovery voltage of the jump-open phase in transient single-phase-to-ground fault with shunt reactors are analyzed. The Laplace transform is used to quantitatively solve various transient components in the restoration voltage, which is revealed theoretically Reasons for the generation of decay period components in the recovery voltage. By comparing the phase voltage waveform of instantaneous fault with that of permanent fault, the criterion of amplitude component of voltage decaying phase component of jump open phase end to identify permanent single-phase ground fault is proposed, The method is simple, accurate and accurate, and it is not affected by the transition resistance. It can be effectively applied to the fault characteristics of single-phase self-adaptive reclosing of EHV transmission lines with shunt reactors The recognition and coincidence moment of choice.