When loading tap selector and this load time vacuum valve for tap selector

摘要

This invention with the wire-wound tap and the wire-wound tap of the step-down transformer cutoff dying when loading in order to change regards the tap selector. Two load divergence sections, are provided vis-a-vis each phase which it should change. Each load divergence section, has one vacuum valve which operates as a main contact one current-limiting resistance at least possesses one which consists of one at a time with another vacuum valve series circuit in parallel vis-a-vis the aforementioned vacuum valve. Each load divergence section two at a time vacuum valves becoming independent, at least, separately mutually the operational two movable contacts it is connected to one vacuum valve which possesses with one common stationary contact structurally.