提出了一种适用于带并联电抗器的输电线路的相间瞬时性和永久性故障判别的新方法，利用三相并联电抗器电感参数的识别结果实现三相自适应重合闸。相间瞬时性故障待故障点熄弧后，三相储能由各自的自振回路释放；而相间永久性故障时，故障相的储能由故障回路可靠释放，非故障相储能则由自振回路得以释放。因此，以瞬时性p模型为参考模型，利用三相并联电抗器电流量实现三相并联电抗器电感参数的识别，由电感参数识别值与真实值的差异来区分永久性故障和瞬时性故障。瞬时性故障情况下，三相自振回路与参考模型一致，三相并联电抗电感求解值与真实值十分吻合。永久性故障情况下，由于故障相故障回路存在，故障相的并联电抗电感求解值与实际值差异显著。大量ATP仿真结果验证了判别方法的正确性和有效性。

This paper proposes a new method to distinguish transient faults and permanent faults for transmission lines with shunt reactors, which uses the inductance parameter identification results of shunt reactors to realize three-phase adaptive reclosure (TPAR). For a transient phase-to-phase fault, the primary charging by the shunt reactors and the capacitances in the tripped phases is released respectively by the self-oscillating loop after the arc is fully extinguished. However, as for a permanent phase-to-phase fault, due to the existence of the fault point, the stored energy in the fault phases is released by the fault loop, but the charged energy in the non-fault-phase is weaken by its self-oscillating loop. Therefore, a current-based TPAR scheme is proposed to identify permanent faults from phase-to-phase faults, which uses the calculated inductances of the shunt reactors by the transient π-type model and employs the difference between the calculated inductances and the real ones to detect transient and permanent faults. Theoretically, in the case of transient faults, the calculated inductances of the shunt reactors are approximately same with real ones, but for permanent faults, the calculated inductances are different significantly from the real ones. ATP simulation results show that the proposed scheme is correct and valid.

国家自然科学基金项目(50677051，50877062)；高等学校博士学科点专项科研基金项目(20060698014)。