Abstract :
Data from a large number of tests on several types of oil circuit breakers are given in this paper. The tests were made on breakers with the following ratings: (a) 150 kv., 1,500,000 kv-a.; (b) 35 kv., 250,000 kv-a.; (c) 7000 volts, 7500 kv-a.; (d) 132 kv., 1,250,000 kv-a., and (e) 132 kv., 750,000 kv-a. These tests were made on power systems having sufficient connected capacity to make the tests conclusive. Complete data are tabulated and oscillograms are shown. Some valuable conclusions resulted from the tests.
