Method of preventing insulated wire breakage and momentary interruption

摘要

Method of generating creeping discharge with certainty without causing puncture is applied on the basis of researching the creeping discharge characteristic of insulated wire. An overhead distribution system including insulated wire is provided with an insulated wire for field relaxation having twice such a predetermined length that creeping flashover is occurred by lightening surge from supported point of the insulated wire by an insulator, but is not followed by AC follow current, and the insulated wire for field relaxation is disposed in parallel to the insulated wire, supported at its central portion by the insulator and connected at both ends of the conductor of the insulated wire for field relaxation to the conductor of the insulated wire and covered at their connected portion with an insulating cover.