Abstract :
THE RAPID EXPANSION of electric power requirements in the Tennessee Valley area has created a demand for circuit breakers which has greatly exceeded previous records both for size and number of units involved. Present requirements call for over 100 3-pole units, all rated at 10,000,000 kva 161 kv, and applicable on highspeed, single-, double-, and triple-reclosing duty at rating factors of 84, 64, and 51 per cent, respectively.
