A Relaying Scheme for Detection and Classification of Shunt Faults in Six-Phase Transmission System Based on DFT-FIS Approach

Anamika Yadav, V. Ashok

Abstract


Hitherto many schemes based on the fuzzy system have been protected by a three-phase transmission system, but not by
a six-phase transmission system. This paper sets out a novel protection scheme based on DFT-FIS approach for detection/
classification of shunt faults in a six-phase transmission system. In this scheme, two separate DFT-FIS modules have
been designed to detect the presence of fault in any of the six-phase(s) and to identify the presence of ground in the fault loop,
thus classifying all 120 types of fault in a six-phase transmission line. The six-phase voltage and current signals are collected
at one end of the transmission line only, thus circumvent dependence on a communication link for remote end data. A widerange
of fault simulation studies were carried out in MATLAB/Simulink environment for all possible shunt fault combinations
by varying fault locations, fault inception angle, fault resistance, short circuit capacity (SCC) of the source and at various fault
conditions such as: close-in faults, remote-end faults, high resistance faults, including CT saturation. Furthermore, the relay
operation time in fault detection/classification is less than one-cycle (<16.67ms) and since the scheme does not experience
any malfunction it is deemed reliable and adaptable.


Keywords


Fuzzy Logic; Discrete Fourier Transform; fuzzy inference system; protective relaying; fault detection; fault classification;

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References


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