A Novel Travelling Wave Based Relaying Scheme Using Wavelet Transforms for Arcing Faults Detection on Series Compensated Transmission Lines

Conventional distance protection relays used in transmission line protection are based on measurement of impedance at the relaying point. In the case of series compensated transmission lines, this impedance is not a reliable parameter to estimate the fault distance. Ultra high speed (UHS) protection can be the proper solution for the protection of series compensated transmission lines. UHS relays can help avoid electric brownouts and grid utility system rotating Blackouts like the one that spanned the north-eastern United States and eastern Canada in August 2003. In this paper, the authors have studied the performance of a novel scheme for detection of arcing nonlinear faults caused across the insulator string on an extra high voltage (EHV) transmission tower. A novel wavelet transform based unit protection relaying scheme for series compensated transmission line is presented. The authors have made novel improvements in UHS relaying using wavelet transforms.