ABSTRACT
Various factors a¡ect the reliability of an electrical substation or switchyard facility, one of which is the arrangement of switching devices and buses. e following are the six types of arrangements commonly used:
1. Single bus 2. Double bus-double breaker 3. Main and transfer (inspection) bus 4. Double bus-single breaker 5. Ring bus 6. Breaker-and-a-half
Additional parameters to be considered when evaluating the con™guration of a substation or a switchyard are maintenance, operational ³exibility, relay protection, cost, and also line connections to the facility. is chapter will review each of the six basic con™gurations and compare how the arrangement of switching devices and buses of each impacts reliability and these parameters.
