Fault Detection of a Hybrid Energy Source Integration with Multiterminal Transmission Line Using Wavelet Analysis

In our current environment, reliability and continuity of service have become extremely important to customers. It is quite common for utility networks to have transmission lines with one or more taps on them between substations.The faults are locatedon a transmission line with multiple line taps and then isolating the effected section of the transmission line, to reduce outage time, is a significant challenge for operators of power transmission grids.In an ideal world, there would be a substation with protection and isolating devices at each tap. As a result, most transmission lines have been built with multiple taps that may or may not have a disconnect switch for isolation. Current solutions being applied for the detecting and isolation of a faulted transmission lines. This paper adopts a new approach for detection, discrimination of faults for five terminal transmission line protection in presence of PV and Wind Energy system. It deals about transient current based protection scheme for multi terminal transmission system with discrete wavelet transform. Fault indices of all phase currents at all terminals are obtained by analyzing the detail coefficients of current signals using bior 1.5 mother wavelet. This scheme is tested for various types of faults in multi terminal transmission system in presence of hybrid generation and it is found effective for detection of faults with various fault inception angle, fault impedance at different distances.