The primary disadvantages of this scheme include the following: Low cost-essentially one breaker per line or transformer.Accommodation of circuit breaker maintenance while maintaining service and line protection.The main advantages of this scheme include: Figure F.1 shows the typical configuration of a main and transfer bus scheme. The circuit is then protected by the bus transfer breaker. The circuit breaker to be maintained and its switches are opened, the bus transfer switches are closed, the switch from the transfer bus to the circuit is closed, and then the bus transfer breaker is closed to re-energize the circuit. If it becomes necessary to remove a circuit breaker from service for maintenance or repairs, circuit operation can be maintained through use of the isolating switches and bus transfer equipment. Under normal operating conditions, all incoming and outgoing circuits are fed from the main bus through their associated circuit breakers and switches. The switches, which have limited ability to interrupt current, serve to isolate components and bus sections.Ī main and transfer bus configuration consists of two independent buses, one of which, the main bus, is normally energized. The squares represent circuit breakers that open the electrical circuit under load or short-circuit conditions. In each of the four figures in this appendix, the bus work or node is depicted as a solid line.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |