Selecting Circuit Arrangements: Requirements and Reliability

Abstract

The basic function of circuit arrangements is to facilitate the operational functions of substations inside electrical networks. In the past, maintainability and accessibility of high voltage equipment were very important due to the requirements for frequent maintenance. Different kinds of circuit breaker designs such as oil-filled breakers and air-blast breakers and also the different types of operating mechanisms required regular maintenance in short intervals. These requirements meant that various configurations and arrangements of substations were developed to isolate the circuit breaker and current transformer in a bay for maintenance while ensuring availability of supply on adjacent equipment. Disconnectors are required to deal with safety requirements and provide physical isolation during maintenance activities.