Abstract
In this paper, a novel adaptive single-phase auto-reclosing method for high voltage transmission lines with shunt reactors is presented. The proposed method applies a low-pass filter and the cascaded delayed signal cancellation (CDSC) technique to the fault phase voltage in order to reveal different characteristics between transient and permanent faults. For transient fault, the fundamental and oscillation components of arc voltage are retained, while in permanent fault situation, only the fundament component is preserved. Based on the above analysis, the average distortion rate (ADR) and the corresponding threshold are designed to discriminate transient and permanent faults and also to identify the arc extinction time if the fault is transient. The proposed method is easy to implement with small computation. Simulation results based on EMTP and calculation results based on Matlab as well as the result of a real case relate to a 500 kV transmission line validate the performance of the proposed method.
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