Fixed contact of tapping selector of combined on-loading tapping switch

Abstract

The disclosed composite-type fixed contact for a tap selector of on-load tap changer comprises: a terminal, a voltage equalizing end, a transitional coupling end, and a contact end with some part inserted in the mounting hole of mounting plate as cuboid and the part contacted with movable contact as column arc shape. This invention is simple and smart to improve action reliability greatly for spread.

Description

Technical field: [0001] The invention relates to a component in a power transmission and transformation system, in particular to a static contact of a tap selector of a combined on-load tap changer. Background technique: [0002] The on-load tap changer is used in power transformers or industrial transformers. It performs tap change when the transformer does not interrupt the load current (that is, on-load condition), changes the turns ratio of the transformer, and adjusts the output voltage of the transformer. [0003] Although the static contact of the existing combined on-load tap-changer tap selector can play the role of connecting the tap of the transformer and being selected by the passive contact, and is widely used, due to structural reasons, There are following disadvantages: [0004] 1. Since the cylindrical surface where the static contact and the moving contact are clamped and connected is perpendicular to the running track of the moving contact, the moving cont...

AI Technical Summary

Problems solved by technology

[0004] 1. Since the cylindrical surface where the static contact and the moving contact are clamped and connected is perpendicular to the running track of the moving contact, the moving contact must stop at a certain point during the operation to make reliable contact with the static contact. Therefore, the precision requirements of the entire transmission system are very high. If the position of the static contact is skewed or the moving contact is not in place, it will cause poor contact or even tripping, resulting in potential accidents.

[0005] 2. Since the static contact is a cylinder, and it is only clamped by bolts and cylindrical pins, it is difficult to fasten. Therefore, when the tap of the transformer is connected by bolt fastening, the static contact is easy to twist or even loosen, which affects the dynamic and static contact. Reliable opening and closing of contacts

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