The spacer is one of the most widely used fittings on transmission lines. With the increase of time, the spacers are prone to appear defects such as aging of rubber ring and pin fallen off, causing potential safety hazards. There are problems such as high labor intensity, high risk, low operation efficiency, and poor construction and maintenance process by using manpower to eliminate spacer defects. Therefore, this paper  designed a robot that can eliminate spacer defects, through the electric field simulation, the maximum field strength on the surface of the robot is mainly located at the tip of the corner, which may exceed 30kV/cm during the online process. When the distance is within 0.1m, the electric field is much larger than the halo field strength, and a stable arc discharge will be formed. Therefore，the electrical part of the robot must use a shielded chassis, the incoming and outgoing cables should be shielded. The metal should be well connected, and the discharge gap should be calculated between different metals with isolation, and the capacitance between the circuit board and the casing should be minimized.
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spacers,liveworking,Robot,electric field distribution