An Investigation of Circuit Breaker Switching Transients for Shunt Reactor

Abstract

Reactor banks play an important role in mitigating the voltage rise, otherwise known as Ferranti rise, which is characteristic to long lightly loaded transmission lines having high capacitive charging current .The energizing and de-energizing of the reactor bank introduces high frequency transient that might stress the insulation of the switching equipment leading to equipment failure. The different phenomenon associated with reactor bank energization and de-energization addresses the issue of circuit breaker application when interrupting low inductive currents from an engineering stand point. In order to study the various transients occurring during the switching of reactor bank in normal switching and switching of reactor bank during fault condition, I thought of publishing the paper in which the topic relates to occurrence of restrikes in circuit breaker. The reason for the occurrence of restrikes in circuit breakers is also to be studied. The simulation model and result of the implemented system are also analyzed. Several parameters affecting this phenomenon, such as arcing time, switching transient over voltages and dielectric co-ordination of interrupter are also to be studied in this dissertation work.