Abstract
A new reclosure scheme applied to parallel transmission lines with shunt reactors is proposed to improve the adaptability of the autoreclosure. Detailed analysis of the fault phase voltage is performed to derive the criteria to distinguish the temporary fault from permanent fault. For different types of ground faults, the integral of fault phase's recovery voltage is used for identifying the permanent grounded faults. For different types of cross-line ungrounded faults, the integral of the modulus of fault phase's recovery voltage is used for identifying the permanent cross-line ungrounded faults. Besides, the phase reclosure sequence principle is used for all the fault types. The performance of the proposed scheme is verified by the digital and analog simulation test for a 500-kV parallel transmission line with shunt reactors for several cases on different fault types and fault conditions. The EMTP-based and physical analog simulation results both show that the proposed scheme is effective.
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