Abridgment of field tests of the Deion circuit breaker

The operating principles of a new type of air circuit breaker for alternating currents are herein outlined, together with results of field test of a 2000-ampere, 15,000-volt, three-phase unit. The special testing facilities of the Commonwealth Edison Company used for the test, the performances of the air circuit breakers under test, and the effects of the test currents on the power system are described.