Carrier-current selector supervisory equipment

R. J. Wensley: There are many applications for remote control of power apparatus where the distance is such that control conductors become prohibitively expensive. Such applications are usually in connection with high-voltage systems where inductive interference would be severe should control circuits be constructed along the transmission right-of-way. The Alabama Power Company solved such a problem in a very ingenious manner. They have an extensive 110-kv., “H”-type wooden-pole transmission system. Their southern loop is to be sectionalized at intervals of about 15 mi. by motor-operated disconnecting switches. As there are several hundred miles of this loop, the construction of separate control circuits would have been very expensive.