Excitation-free positive-negative voltage-regulation tap changer

Abstract

The invention relates to a non-excitation forward and reverse voltage regulating tap changer for transformers, which is characterized in that each layer of static contacts arranged on the insulator includes taps (K) of each phase connected to the main coil, output contacts Head (X) and the static contact connected to the voltage regulating coil, wherein the static contacts connected to the main coil tap (K) and the static contacts connected to the voltage regulating coil tap are equal in number and arranged alternately on one side of the insulator On the half circle, the number of static contacts of the output contact (X) is equal to the number of static contacts connected to the taps of the voltage regulating coil, and they are arranged alternately on the half circle on the other side of the insulator, corresponding to the static contacts of each layer. Two moving contact assemblies are arranged on the insulating shaft. The invention not only simplifies the contact structure of the switch, compresses the axial structure of the switch, greatly reduces the height of the switch, but also improves the overall rigidity of the switch, which is more conducive to the arrangement of the external tap lead wires of the switch and the insulation treatment between them, and is convenient maintain.

Description

technical field [0001] The invention relates to an off-excitation forward and reverse voltage regulating tap changer used in a transformer, which is an improvement on the existing off-excitation tap changer. Background technique [0002] In Chinese patents 00230482.1 and 03275712.3, several non-excitation positive and negative voltage regulating tap-changers with different structures are proposed. These switches have the characteristics of compact structure, small size, and slender shape, which can make full use of the effective space of the transformer. However, due to the staggered layout of the upper and lower layers of the K layer and the X layer, the axial length of the switch is too high with the increase of the voltage level of the switch and the increase of the current, so that some transformers cannot be arranged in the internal height. In addition, because the main shaft of the switch is too long and there are too many parallel contacts, the rigidity of the main s...

AI Technical Summary

Problems solved by technology

However, due to the staggered layout of the upper and lower layers of the K layer and the X layer, the axial length of the switch is too high with the increase of the voltage level of the switch and the increase of the current, so that some transformers cannot be arranged in the internal height.

In addition, because the main shaft of the switch is too long and there are too many parallel contacts, the stiffness of the main shaft of the switch is insufficient, and at the same time, the stiffness of the main body of the switch is also deteriorated, thus limiting the scope of use.

For many three-coil on-load tap-changing transformers, the on-load switch and the off-excitation tap-changer are generally arranged at the same terminal. There is enough space here to arrange off-excitation positive and negative tap-changers with a large outer diameter range. The above-mentioned switches Structural advantages are no longer obvious

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