EHV/UHV Transmission Line Protection Using Traveling Waves

Abstract

In this paper, a protection methodology based on traveling waves has been proposed for reinforcing extra high voltage (EHV)/ultra high voltage (UHV) transmission lines’ protection. The proposed methodology detects a fault using the magnitude of d-axis components of traveling wave. The magnitude of d-axis components is found using the d-q transformation of traveling wave (detail coefficients) obtained from the 3-ɸ current signals after passing through DWT, multi-resolution analysis (MRA). Once the fault is identified, the arrival time of the first incident traveling waves received at transmission line’s both ends is employed for the fault distance estimation within a quarter cycle. The performance of the proposed methodology has been corroborated on the Western System Coordinating Council (WSCC)—9 bus system in EMTP/PSCAD platform. The results presented on this paper indicates the efficacy of the proposed methodology.