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An Enhanced Zone 3 Algorithm of a Distance Relay using Transient Components and State Diagram  

허정용 (성균관대 공대 정보통신공학부)
김철환 (성균관대 공대 정보통신공학부)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers A / v.53, no.3, 2004 , pp. 161-167 More about this Journal
Abstract
Zone 3 of the distance relay is used to provide the remote back-up protection in case of the failure of the primary protection. However, the risk lot mal-operations under stressed conditions such as heavy loading, voltage and transient instability is usually high. Zone 3 is used in combination with the derivatives of the voltage, and current, etc to prevent mal-operations. Sometimes, the impedance characteristics that restrict the tripping area of relay are used to avoid the mal-operations due to load encroachment. This paper presents a novel Zone 3 scheme based on combining the steady-state components (i.e. 60Hz) and the transient components (TCs) using a state diagram that visualizes the sequence of studies that emanate from the sequence of events. The simulation results show that the novel zone 3 distance relay elements using the proposed method operates correctly for the various events.
Keywords
Zone 3; Distance Relav; Transients; State Diagram; Voltage Instability; Power System;
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