A NEW PROTECTION RELAY BASED ON FAULT TRANSIENT ANALYSIS USING WAVELET TRANSFORM

Abstract

The paper presents novel approach in distribution protection technic of fault line selection based on analysis of generated transient. Advantages of discrete wavelet transform for signal analysis are discused. The potential of using discrete wavelet transform in protective relay is examined and model of relay using transient phenomena to fault line selection in distribution system is proposed and next integrated into ATP simulation program. Detailed model of distribution system was made in ATPDraw with connected relay through CT model for consideration of possible saturation effect. Simulations were performed for algorithm evaluation with included detailed model of arc fault or high impedance ground fault and results show excellent discrimination function under various operating conditions. K e y w o r d s: digital relay model, discrete wavelet transform, fault transient, arc model 1