Development of Busbar Termination Scheme to offer Lower Cross-section for Same Current Rating of Air Circuit Breaker

Abstract

Air Circuit Breaker (ACB) is an upstream protection device for LV distribution sys- tem. ACB is designed to protect the system in case its downstream protective device fails to clear the fault. Busbar termination schemes generally used for ACB termina- tion where proper termination of ACB plays very important role in healthy working of ACB. There exist standardize practices & guidelines for ACB termination. Any deviation in above standardize practice may cause overheating of breaker inside dis- tribution panel. IEC standard has recommended busbar cross-section for defined current rating but deviation to use recommended cross-section was observed at cus- tomer end to reduce cost impact. To overcome that new busbar termination scheme has to be developed to offer lower cross-section for same current rating without any compromise in thermal performance. Which will serve cost-effective termination for customer.