Innovative contact switching mechanism of tapping switch

Abstract

The invention relates to an innovative contact switching mechanism of a tapping switch for a transformer. A center hole of moving contacts penetrates an integrated pin; two bearings are embedded at two ends of the integration pin respectively; each bearing is embedded into a sliding block; each sliding block abuts against a spring; each spring is supported on a support; the supports are fixed on a main shaft; fixed contacts are circumferentially distributed on the main shaft; every fixed contact is connected with a transformer coil tap through a cable. The operation mode of the innovative contact switching mechanism includes that every moving contact is driven to be circumferentially switched and in bridging joint between the two corresponding adjacent fixed contacts to switch on a circuit when the main shaft is controlled to rotate and accordingly a shift regulating task of the tapping switch is achieved. The innovative contact switching mechanism is characterized in that the penetration serial connection is performed on the butterfly-shaped moving contacts which are pairwise folded through squeezing caps which are arranged at two ends of the integration pin respectively to apply the elastic pre-tightening force for axial condensation. According to the innovative contact switching mechanism of the tapping switch, the contact is simultaneous, the structure is simplified, the combination is flexible, the switching is synchronous, the reversing is accurate, the temperature rise is low in value, the resistance is stable, the operation is reliable, and the torque is light.

Description

technical field [0001] The invention relates to the core structure in the tap changer of the transformer voltage regulating component in the field of power transmission and transformation. Specifically, the tap changer can realize the voltage regulation of the transformer by switching the movable contact piece to switch between different fixed contacts to complete the conversion gear and then lift up and down Instant voltage body. [0002] Among the contact switching mechanisms of the same kind for tap changers, the present invention embodies the respective advantages of the circular moving contact ring mechanism and the plate type moving contact piece mechanism in contact switching, overcomes their respective deficiencies, and improves the advantages of both. Performance is innovative design. technical background [0003] At present, the voltage regulating components for large transformers suitable for high voltage and high current mainly include drum tap changers. Please ...

AI Technical Summary

Problems solved by technology

[0003] At present, the voltage regulating components for large transformers suitable for high voltage and high current mainly include drum tap changers. Please refer to figure 1 and tube tap-changers see figure 2 , the drum-shaped tap-changer adopts a circular dynamic contact ring rolling contact switching mechanism, which is described in the background technology of the patent No. The advantages of the contact switch are: "strong operating feel, precise positioning"; the disadvantages are: "the previous rolling contact switching mechanism of the moving contact ring, when the diameter of the moving contact is too large, its own stability is poor and it is easy to be skewed. When the insulation level between the static contacts is high, the distance between them increases, so that the moving contact ring bridged between them sinks too deep, the switching torque increases or even cannot rotate, and the application of the contact structure is limited. ";

[0004] The tubular tap changer adopts a sliding contact switching mechanism with a sheet-like moving contact plate, which is described in the content of the invention of the patent No. ZL03264291. The advantage of the tap changer is that the laminations of the sheet-shaped moving contact plate are thick and thin, so the axial dimension of the high-current type tap-changer with many moving contact plates can be reduced a lot, so the overall height of the tubular switch can be made Shorter, sheet-like moving contact plate no matter how wide the pressure-resistant distance between two adjacent fixed contacts, it can still span and switch smoothly, which makes up for the shortcomings of the drum-shaped tap changer; the disadvantage is: the operating feel is not strong , there is a misalignment difference between the moving contact plate and the fixed contact when the gear is reached, which is exactly the advantage of the drum tap changer; then, is there an innovative contact switching mechanism for the tap changer that has both advantages, and the two What about lack of nothing?

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