Fault Detection During Power Swing Using Fast Discrete S-transform

This paper presents a method for detection of fault during power swing on the transmission line using fast discrete S-transform (FDST). The energy of FDST coefficients is calculated in one-cycle moving window for each of the three-phase current signals. This FDST energy is considered as fault detection index. A 400 kV 9-bus IEEE system is simulated in EMTP, and three-phase fault currents are recorded at one end of the transmission line to find the fault detection index. In this paper, various kinds of faults are diagnosed quickly and accurately for different locations, fault resistances with various fault inception times. It will be shown that the fault detection delay is less than a cycle in both noisy and noise-free condition.

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