The high-speed circuit breaker in service on the Illinois central railroad

The purpose of this paper is to describe briefly the distribution system of the Illinois Central Suburban Electrification and to state considerations influencing the selection of high-speed circuit breakers for d-c. feeder and machine protection. The knowledge gained by nearly two years´ operating experience with this system, which contains 98 high-speed circuit breakers, and the conclusions reached, are also presented.