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ABSTRACT
This study aims to develop a new relaying scheme for the complete protection of transmission line based on only voltage data. Fault detection and classification is obtained from the fundamental component of the voltage signal collected from one end of the line. Magnitudes of positive sequence component of voltage signals from both ends of the line have been considered for fault location. As only magnitude of voltage signal is used, the requirement for data synchronization can be avoided, and the error caused by current transformers (CT) is eliminated. Moreover, positive sequence components exist for all types of faults, unlike negative sequence components. Hence, all types of faults can be located. Fuzzy decision approach has been proposed to avoid computationally expensive training of expert systems. The proposed scheme has been tested for different dynamic situations in MATLAB/Simulink software. The superiority of the scheme has been established by considering coupling capacitor voltage transformer (CCVT) transient error, weak infeed condition, change of transmission voltage level and line loading.
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Notes on contributors
Biswapriya Chatterjee
Biswapriya Chatterjee received his MEE degree from Jadavpur University in 2010. Presently, he is working as an assistant professor with the Electrical Engineering Department of Aliah University, Kolkata, India.
Sudipta Debnath
Sudipta Debnath received her PhD in 2007 from IIEST Shibpur (formerly, BESU, Shibpur). Presently, she is working as a Professor with the Electrical Engineering Department of Jadavpur University, Kolkata, India. Email: [email protected]