A novel phasor-based adaptive single-phase auto-reclosing scheme for transmission lines with shunt reactors

A novel adaptive single-phase auto-reclosing method is proposed, which utilizes the internal product ratio of mode voltage to accurately determine the fault natures and the secondary arc extinction time of high-voltage transmission lines equipped with shunt reactors. In this paper, the correlation between the sum of the fault phase voltage and the healthy phase voltage under different fault conditions is deduced by using the equivalent circuit model, and the correlation is extracted by converting the voltage phasor into modulus by using the Karrenbauer matrix. Based on this, the setting values and threshold values are established as the criteria of fault natures and arc extinction time. The method is simple to implement, requires little computation, does not need frequency domain calculation, is not affected by low frequency oscillation components, and has low latency. The proposed scheme is applied to 500 kv transmission lines by EMTP, which simulates the transient and permanent faults under various fault conditions. Multiple simulation results validate the effectiveness and reliability of the proposed scheme.