Arc Flash Hazard Assessment in Medium Voltage Switchgear: A Case Study in Cement Plant

Abstract

This paper presents the procedures for performing arc flash hazard assessment in medium voltage switchgear. A cement plant is used as an example to demonstrate the assessment procedures. The results shown that the assessment should consider the operating conditions of the system, to ensure the arc flash hazard level. The contribution of generator changes the short circuit current, which in turn changes the operating time of the protective relays. This results in the significance of increase in the incidentl energy and hazard level at switchgear.