MOF FOR RELIABILITY IMPROVEMENT

摘要

PURPOSE: A voltage/current transformer for metering service in order to improve reliability is provided to improve a partial discharge property by relieving an electric field concentration in an upper plate hole cutting plane of an electrical box by burring the upper plate part of the electrical box. CONSTITUTION: An electrical box (110) accommodates multiple bushings (120), a current transformer for metering service, and a voltage transformer for metering service. The internal space of the electrical box is filled with insulating oil (150). An electric field concentration in an upper plate hole cutting plane is relieved by burring the upper plate part of the electrical box. A bracket (125) is arranged in the upper part of the electrical box of the voltage/current transformer for metering service and fixes the bushing. The bracket prevents an electrical field concentration phenomenon of electrical box structure which is caused by a high voltage conductor inside of the bushing by being comprised of an insulator which has a high mechanical strength.