METHOD FOR CLEANING PCB IN ELECTRIC APPARATUS

PROBLEM TO BE SOLVED: To obtain a simple and safe method for cleaning PCB in an electric apparatus, for simultaneously detoxifying and cleaning not only insulating oil but also an internal member present in the electric apparatus, while dissolving and detoxifying a small amount of PCB in the insulating oil containing PCB at normal temperature and normal pressure.SOLUTION: The method for cleaning PCB in a transformer 2 which stores the insulating oil 3 internally containing PCB includes: a process to successively extracting the insulating oil 3 from the transformer 2; a process to make the extracted insulating oil 3 be brought into contact with a ceramic treatment agent with alkali metal impregnated thereto and to dissolve the PCB thereby detoxifying the insulating oil; and a process to return the detoxified insulating oil 3 to the transformer 2. The processes are successively repeated at the normal temperature and normal pressure and the insulating oil 3 is circulated between the inner part of the transformer 2 and the ceramic treatment agent. Thus, the insulating oil 3 and the internal member 8 inside the transformer 2 are detoxified and cleaned.