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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π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。
A new method of instantaneous and permanent fault identification for transmission line with shunt reactors is proposed. Three-phase adaptive reclosing is realized by using the identification results of three-phase shunt reactor inductance parameters. Interphase transient fault To be out of arc fault, the three-phase energy storage by the release of the respective self-resonant circuit; and the permanent fault phase, the fault phase of the energy storage by the fault release circuit reliably, non-fault phase energy storage by the natural vibration The circuit is released. Therefore, using the instantaneous π model as a reference model, the inductance of the three-phase shunt reactor is identified by the current of three-phase shunt reactor, and the permanent fault and transient fault are distinguished by the difference between the identification value and the real value of the inductance parameter. Under the condition of instantaneous fault, the three-phase self-resonant circuit is consistent with the reference model. The solution of the three-phase parallel reactance inductance is in good agreement with the real value. In the case of permanent fault, due to the existence of fault phase fault circuit, the difference between the solution value of parallel reactance of fault phase and actual value is significant. A large number of ATP simulation results verify the correctness and validity of the discriminant method.