Washington 4-kv primary network systems

THE POTOMAC Electric Power Company started the use of 4-kv primary networks about 1939. Since that time the procedure has been to prevent load growth on existing substations supplying 4-kv radial feeders by establishing primary networks in the outlying portions of the areas served by the existing radial stations. It is in these areas that the load growth is most rapid. Studies have shown that, with distributed load, this method is more economical than expanding the use of 4-kv radial feeders if the radial system is made firm up to the point where distribution from the 4-kv feeder begins.