Adaptive Protection of Parallel Transmission Lines Using Combined Cross-Differential and Impedance-Based Techniques

摘要: This paper introduces a state-diagram-based protective algorithm for parallel circuit transmission lines using local information obtained at the relay bus. A new cross-differential technique is proposed which compares currents in corresponding phases of circuits 2-D space. companion impedance-based used to cover evolving faults and some conditions not able discriminate internal alone. The effect mutual coupling between on measured impedances adaptively compensated according status segmented combines outputs techniques provide reliable response under all operating statuses circuits. Extensive simulation studies PSCAD/EMTDC software indicate that approach provides very protection double-circuit lines. It covers intercircuit faults, reliably select faulted phases.