Excitation-free positive-negative voltage-regulation tap changer

Abstract

The invention involves a kind of off-circuit tap-changer without field excitation that is used for transformer, the features of which are the fixed contactor on each layer that is arranged on the insulator including the main coil tap (K) that connects with each phase, the output contactor (X) and the fixed contactor that connects with the pressure regulation coil, among which the quantity of the fixed contactor that connect with the main coil tap (K) and the quantity of the fixed contactor that connect with the pressure regulation coil tap is same and are arranged on a half circumference of one side of the insulator crisscross and intervalic, the quantity of the fixed contact of the output contactor (X) and the quantity of the fixed contactor that connnect with the tap of pressure regulation coil is same and are arranged on the opposite half circumference of the other side of the insulator crisscross and intervalic, two movable contacts subassembly are designed on the insulation axis by corresponding to the fixed contact on each layer. The invention does not only simplify the contact structure of switch, compress the axial structure of switch, reduce the height of switch dramatically, but also enhance the whole stiffness of switch, and makes it more beneficial to be connected outside and to be connected separated, distribute and arrange wirings as well as the disposal of the insulation among which, and makes it convenient to 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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