High-Impedance Impedance Fault Identification on Distribution Networks
Abstract: This paper presents a transient transient-based algorithm for high-impedance impedance fault identification on distribution networks. It uses the discrete wavelet transform to monitor high- and low-frequency frequency voltage components at several points of the power system, being able to indicate the most likely area within which the disturbance has occurred, without requiring data synchronization nor the knowledge of feeder or load parameters. The propos proposed ed algorithm is evaluated through electromagnetic transients program simulations of high high-impedance impedance faults in a 13.8 kV system modeled from actual Brazilian distribution grid data. Solid faults, capacitor bank switching, and feeder energization are also simulated, sim considering the system with and without distributed generation. Obtained results show that the algorithm significantly reduces the search field of the highhigh impedance fault, reliably distinguishing it from other disturbances.