HHT based protection for series compensated double circuit transmission lines considering evolving and cross-country faults

In this paper a fault detection and classification technique has been pro- posed for series compensated double circuit transmission line (SCDCTL) using Hilbert Huang Transform (HHT). The series compensation makes the fault detection a difficult task in SCDCTL. Furthermore, the traditional protection schemes may fail to detect the faulty phase when complex and simultaneous faults occur in the line. From the Ensemble Empirical Mode Decomposition (EEMD) of the current signals, Current signals have been collected from the two ends of the line and Discrete Tea ger Energy has been calculated for each phase to detect and classify faults. The performance of the proposed scheme has been validated for variation of series compensation level, close in faults, reverse power flow, evolving fault, cross-country and complex cross-country faults through extensive simulation results. Power swing and time delay in obtaining data from the remote end has also been considered to test the suitability of the proposed technique in SCDCTL. Comparison with other recent approaches establishes the superior performance of the proposed technique.