Off-circuit tap-changer

Abstract

The invention provides an off-circuit tap-changer. The off-circuit tap-changer comprises a static contact bearer and a main shaft mounted on the static contact bearer through penetration, wherein an upper portion of the main shaft is connected with an operation mechanism, a lower portion of the main shaft is connected with moving contact assemblies, the static contact bearer is circumferentially provided with static contacts with intervals, moving contact assemblies are correspondingly in bridge connection with two adjacent static contacts and further closely contact with the static contacts, the moving contact assemblies comprise annular elastic moving contacts and supporting members, the supporting members are connected with the main shaft, the annular elastic moving contacts are sleeved on the supporting members, inner circumferential surfaces of the annular elastic moving contacts are matched with the supporting members, and outer circumferential surfaces are matched with the static contacts. The off-circuit tap-changer has advantages of stable contact, high reliability and convenient shifting.

Description

technical field [0001] The invention belongs to the technical field of tap changers, in particular to an off-excitation tap changer. Background technique [0002] The existing off-excitation tap changer contacts include a fixed contact and a moving contact that bridges between two adjacent fixed contacts. The ring moving contact is in reliable contact with the fixed contact under the spring force. When shifting gears, under the action of the torque of the main shaft and the supporting member, the annular moving contact overcomes the pressure of the spring and runs along the surface of the columnar static contact from one side to the other side of the fixed contact to complete the gear shifting process. The ring-shaped moving contact has the characteristics of simple structure, strong operation feel, precise positioning and the like. However, the size of the cantilever at the front end of the radial spring pin of this contact structure is too large, and the size of the rear...

AI Technical Summary

Problems solved by technology

However, the size of the cantilever at the front end of the radial spring pin of this contact structure is too large, and the size of the rear end matched with the support is too small, resulting in a too small ratio of the mating section of the radial spring pin to the cantilever section, and the operating torque is too large, which is easy to When the stroke of the annular moving contact is too large, the switching torque increases or even does not turn (not self-shrinking).

Especially the high current and multi-phase combination switch is more difficult to realize when the insulation level between the static contacts is high, which limits the application of this contact structure

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