Single-Phase Autoreclosure on the 330-Kv Kariba Transmission System

The paper reviews the application of autoreclosure to extra-high-voltage (EHV) transmission systems and examines the relative merits of 3-phase and singlephase autoreclosure. Laboratory experiments for determining the behavior of the residual are during single-phase autoreclosure are described, and results given of tests at a switchgear test plant simulating conditions for 270 miles of 330-kv line. Corroborative field tests and system operating experience are recorded indicating satisfactory performance of single-phase autoreclosure on 330-kv lines up to 200 miles long.