Substation Area Backup Protection Algorithm for Phase Comparison of Segregated Current Fault Component

Abstract

Substation area backup protection currently only relies on the traditional relay protection principle, and does not fully exploit the inherent fault characteristics in the multi-source data of the station domain. In response to these problems, this paper proposes a substation area backup protection algorithm for phase comparison of segregated current fault component. The algorithm takes all electrical elements in the substation station as the protection object. In light of the phase relationship between external faults and internal faults of the protected electrical elements, the phase relationship is quantified and the fault elements are identified according to the quantified results. A typical 220 kV intelligent substation model was built by using electromagnetic transient software PSCAD. The different fault types, fault locations and transition resistance operating states were simulated. The results show that the fault recognition method based on substation area backup protection for phase comparison of segregated current fault component is accurate and effective.