A new single-pole service restorer

The widespread and general use of three-phase automatic service-restoring equipment on low-cost low-revenue distribution lines has created a field for a single-pole service-restoring device having continuously adjustable characteristics for trip current and time delay, and powered by a prestored source of energy. The device described in this paper utilizes a new and unique application for the prestoring of the operating energy and the restoration of the utilized operating energy after transient fault conditions.