Abdul W. Kumar, Harish Kumar Verma and Shashank Singh
Incremental power, incremental current, SVC, signum function, transmission line, fault detection
A fault detection and classification technique based on the use of signum function of instantaneous power, and proposed by Papiya Dutta et al., fails to detect faults with high resistance values. In another fault detection technique based on the use of a modified signum function of incremental power, the relay mal-operates in some cases. In this paper, a novel technique based on a modified signum function of incremental current has been proposed for the detection and classification of faults on a transmission line compensated with SVC. A 3-bus, 230-kV, 50-Hz system has been simulated in PSCAD/EMTDC to evaluate the accuracy of this technique. Fault resistance values in the range of 0.01–1000 ohms have been simulated. Two values of DC offset have been tested for each fault resistance value, i.e., 0 percent and 100 percent. The results show that the proposed technique detects and classifies all types of faults, i.e., LG, LLG, LL and LLL faults, for all fault resistances and for the two extreme values of DC offset in current signals. Moreover, the relay does not operate on any external fault with any amounts of fault resistance and DC offset. The proposed technique has also been validated on the IEEE-118 bus system.
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