港湾施設の複式変圧外部電源方式による陰極防食法

抄録

In the conventional catholic protection by impressed current system of one-step transformer-rectifier type, there has been the disadvantage that the power loss in the direct current wiring circuits was quite large because of large current in the circuits.
A new cathodic protection system, which consisted of a main control transformer and some numbers of small transformer-rectifier sets installed in short distance from electrodes, has been developed.
In the new cathodic protection system, the power loss in the wiring circuits is almost negligibly small because of much shorter direct current wiring circuits.
Some technical problems concerning the design, installation and field experiences of the newly developed two-step transformer-rectifier cathodic protection system for marine structure are discussed.