A Research on Modeling of High Impedance Fault Detection for Protection of Dc Distribution System

Abstract

Abstract: High ohmic resistance faults area unit troublesome to find by standard overcurrent relays principally thanks to their low current magnitudes. This paper describes a model for representing high ohmic resistance faults in electrical distribution systems. The model is predicated in a very non-linear resistance representing the high ohmic resistance path throughout this sort of faults. Supported this model, the performance of many electrical variables associated to high ohmic resistance faults is analyzed and an algorithmic rule for top ohmic resistance fault detection in electrical distribution systems is given. Field activity and pc simulations validate the high ohmic resistance fault model and therefore the projected fault detection algorithmic rule. A high ohmic resistance fault (HIF) is generated once an energized conductor (of a primary feeder) makes contact with the bottom or with neighboring objects like branch trees, overgrown vegetation, building walls, asphalt, any object to ground. Such faults area unit undetectable by standard overcurrent devices like overcurrent relays and fuses as a result of their low current magnitude. What is more, arcing accompanies high ohmic resistance faults (hifs) and represents a risk of security to folks and injury to physical infrastructure. Thus, so as to get a trustworthy detection algorithmic rule, it's necessary to possess a reliable high ohmic resistance fault model. This paper presents an analysis of the HIF trial run results and a technique for modeling hifs by considering one nonlinear resistance to represent the fault.