An innovative transient-based protection scheme for MV distribution networks with distributed generation

This paper presents a new transient based scheme to detect single phase to ground faults (or grounded faults in general) in distribution systems with high penetration of distributed generation. This algorithm combines the fault direction based approach and the distance estimation based approach in order to determine the faulted section. The wavelet coefficients of the transient fault currents measured at the interconnection points of the network are used to determine the direction of fault currents and to estimate the distance of the fault. The simulations have been carried out by using DigSilent software package and the results have been processed in MATLAB using the Wavelet Toolbox.