Resistance effect on 230-kv faults at Grand Coulee

Early studies and calculations^1,2 concerning the bussing at 230 kv of the generators at the Grand Coulee Power Plant and the lines emanating therefrom indicated that the asymmetrical fault currents to be encountered as the Coulee installation grew would increase very rapidly and the development of ultrahigh interrupting-capacity circuit breakers, as well as means of limiting the fault current, were investigated thoroughly.