Detection and Classification of Fault in Transmission Line Using PAC Technology Based Real Time SCADA System

The paper presents the hardware realization of detection and classification of fault in the π-model based 360 km transmission line by using Programmable Automation and Control (PAC) technology based real time SCADA system. The power system is monitored by means of National Instrument Compact Reconfigurable I/O (CRIO) devices and Labview software is used to interface the CRIO devices with computer. When any fault is experienced by the system, the waveforms of voltage and current are distorted due to transients and their change of patterns depends on the type of fault. The current signals (3-phase alternating current, zero and positive sequence currents) are processed directly for relaying and those signals are acquired during fault. Extensive studies have been carried out to verify and validate the proposed methodology. The protection of power system with digital technology and fuzzy logic approach can be achieved very fast and the system becomes highly reliable, and secure.