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针对带并联电抗器的超高压输电线路,详细分析了发生单相瞬时及永久性故障时,故障相并联补偿电流自由分量的故障特征,并在此基础上提出一种利用并联补偿电流自由分量的变化特征进行故障识别的单相自适应重合闸新判据。永久性故障时,故障点一直存在,并联电抗器通过线路和故障点对地放电,自由分量呈现衰减趋势;瞬时性故障时,二次电弧的熄灭和重燃以及彻底熄弧后自由振荡分量的出现,使得自由分量也随之变化。可见,在不同故障类型下,并联补偿电流自由分量的变化特征有明显差异,因此可用于进行故障识别。大量ATP/EMTP电磁暂态仿真表明,所提出的方法能够快速、准确地识别故障性质,且基本不受线路长短、熄弧时间、故障位置、采样频率等因素的影响,适用于带并联补偿输电线路的快速单相自适应重合闸。
For EHV transmission lines with shunt reactors, the fault characteristics of the free component of parallel compensation current in single-phase instantaneous and permanent faults are analyzed in detail. Based on this, a method is proposed to make use of the parallel compensation current free components The New Criterion of Single-phase Adaptive Recloser for Fault Identification Based on Variation Characteristics. Permanent fault, the point of failure has always been shunt reactor shunt through the line and the fault point, the decay trend of free components; instantaneous failure, the secondary arc extinguishing and re-ignition and after the complete extinction of the free oscillation component Appears, so that the free component also changes. It can be seen that under different types of faults, there are significant differences in the characteristics of free-component compensation of shunt compensation current, so it can be used for fault identification. A large number of ATP / EMTP electromagnetic transient simulations show that the proposed method can quickly and accurately identify the nature of the fault and is basically independent of line length, arc time, fault location, sampling frequency and other factors, and is suitable for power transmission with shunt compensation Line fast single-phase adaptive reclosing.