Cathodic protection of transmission and distribution underground cables

This paper contains a brief description of the original 125-kv Somastic-coated pipe cable system of the Florida Power Corporation, and the additions to that pipe cable system. The graphite anode-rectifier type of cathodic protection system originally installed, and the deep ground bed-rectifier addition are discussed. Operation of the pipe cables is tied in with the type of cathodic protection installation selected. In one area, both pipe cables and 12-kv lead-sheath cables are being protected by a common rectifier. The operation of this deep ground bed on the pipe cable and lead-sheathed cables is explained. Mention is also made of damage made by shellfish to a 12-kv submarine cable crossing.