ARC-FLASH INCIDENT ENERGY DETERMINATION FOR ENERGIZED 11KV PANEL IN RUMUODOMAYA 33/11KV INJECTION SUBSTATION

Abstract

Electricity distribution networks often require a change in configurations as a result of inclusion of new electrical loads and in some cases older loads being increased or expanded in terms of their capacity. The use of distribution equipment can occasionally cause a very dangerous incident known as an arc flash hazard, which could damage the equipment and cause greater harm to workers or operators of the equipment. Analysis is crucial in determining the level of arc flash hazard and improving worker’s protection. The National Fire Protection Association (NFPA) 70E standard is used in this paper to perform an arc flash analysis on 11kV panels. Rumodomaya 33/11kV injection substation facility was investigated. The Electrical Transient and Analysis Program (ETAP) software is used to analyze the Arc Flash Hazard (AFH) of a 11kV distribution network. This research entails the use of bolted fault and arc fault currents, for the estimations of the incident energy, the permissible protection and restriction boundaries. It as well as determines the appropriate personal protective equipment (PPE) and warning label. The incident energy obtained for 18 – 36 inch working distance, range from 2.510 - 4.256 cal/cm². As the relay's clearing time increases or distance from the panel decreases, so does the risk increases. This work provides useful analytic technique for designers and engineers who engage in risk assessment of energized panels determine PPE for workers.