Overview

This switch is a kind of imbedded on-load tap-changer of composite resistance transition. The switch has its separate oil container which is isolated from the transformer, and uses the transformer oil as the medium of insulation and arc suppression; therefore, its construction is simple, the volume is compact, its is also convenient for the user to check and repair it and replace the oil. The upper part of the mounting flange of the switch, namely the part that appears above the plane surface of the oil tank of the transformer, it is the mechanical driving part, with the one-phase motor driving the second grade worm-and –gear doing gearing down, with the bow plate under the upper baffle plate driving the main spring to stretch for energy storage, using the energy released by the “over-die-point” of the spring to drive the slot-dialing part and the slot-dialing part to drive the slot-wheel to transfer the movement with a certain angle, so that it completes the operation task of the switch. Between the main movable contact on the supporting shelf of the movable contact and the auxiliary contact, the transition resistor completes the current-limiting function in the course of switching, there is copper-tungalloy inlaid respectively on the movable and stationary contacts, which makes the service life of the switch full enough to reach the required technical index.

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