Dynamic Analysis of Spring Operated Drive Mechanism in Circuit Breaker

Abstract

In any power system, Circuit breaker is used to operate any electrical equipment in, on load condition as well as in case of severe short circuit faults, which require handling of large mechanical stresses. Hence, the drive used to operate the Circuit breaker shall have su cient energy to overcome the said stresses and open or close the circuit breaker in reliable manner maintaining adequate operating times (opening and closing) within permissible limits. The objective of this dissertation is primarily to study the dynamic behavior of the drive used to operate the Circuit breaker during opening and closing operations. The analysis of dynamic stresses imposed on di erent component of the drive dur- ing closing and opening operations is performed using Multi-body Dynamics (MD) software-ADAMS. As outcome of above study it is possible to reduce (4.8 %) the opening time of circuit breaker by changing the preload condition of opening spring of the drive, maintaining other requirement as per applicable standards.