Co-ordinated protection for open-wire joint use - minneapolis tests

THE rapid growth of suburban areas in the vicinity of the larger cities has created many problems for both power and communication companies. A number of power companies have chosen to meet load growth in such areas by increasing their primary distribution voltage. Such increases in voltage have in general been accompanied by substantial increases in substation, feeder, and subtransmission capacity. These changes have in turn introduced problems concerning the maintenance and operation of overhead lines jointly occupied by the power and communication companies.