Effect of Current Limiting Reactors on Turbo-Generator Systems under Conditions of Short Circuit

An account of a cable breakdown near one of the generating stations of the Commonwealth Edison Company´s system. The breakdown resulted in a second breakdown on same line within the station, which prevented the oil switch from automatically disconnecting the fault. The system is amply protected by reactors for generators and between bus sections. Their effect on the stability of synchronous apparatus on sections protected by them is very marked. The protection to generating station apparatus was complete. Comparison of maximum stresses encountered in the short circuit as it occurred with what they might have been without reactors present are made, and the conclusion is drawn that without them the damage resulting would have been considerable and the service interruption far more general and serious.