An on-load voltage regulating capacity regulating tap changer

Abstract

An on-load pressure regulating tap changer, including three sets of operating mechanisms, three capacity regulating switches and two pressure regulating switches, each operating mechanism has a set of bistable permanent magnet components and a toggle rod, each switch It includes a vacuum-sealed insulating cylinder, the switching surfaces of the moving contact piece and the static contact piece are located in the vacuum cylinder cavity of the insulating cylinder; the width of the switching surface of the high-voltage side static contact piece among the three capacity-adjusting switches is smaller than that of the low-voltage side width. Because the switching surface of the dynamic and static contacts is located in the vacuum cylinder cavity, the present invention has the advantages of reliable arc extinguishing performance, long service life and transformer oil will not be polluted by arcs; moreover, the high-voltage winding is cut off first, and then the low-voltage winding is cut off. After connecting the low-voltage winding first, and then connecting the high-voltage winding, the arc is small, which is conducive to eliminating the residual magnetism in the transformer core, avoiding the inrush current and overvoltage when the high-voltage side winding is connected again, and effectively reducing the voltage fluctuation during the switching process. Amplitude purpose.

Description

【Technical field】 [0001] The invention relates to a part of a voltage regulating and capacity regulating transformer, in particular to an on-load voltage regulating and capacity regulating tap changer matched with a voltage regulating and capacity regulating transformer. 【Background technique】 [0002] The on-load capacity and voltage regulation tap changer is a device for adjusting the capacity and voltage of the transformer under the state of excitation or uninterrupted load. It is especially suitable for capacity and voltage regulation distribution transformers with large load changes and grid fluctuations to achieve energy saving and consumption reduction. . It is placed in the oil tank of the distribution transformer and immersed in the transformer oil. The structure includes a capacity regulating part composed of several operating mechanisms and capacity regulating switches, a voltage regulating part composed of several operating mechanisms and voltage regulating switc...

AI Technical Summary

Problems solved by technology

The problems are: 1. During the process of capacity regulation and voltage regulation, the arc generated by the switching of the dynamic and static contacts will pollute the arc extinguishing medium transformer oil, resulting in a rapid decline in the insulation performance of the transformer oil, which seriously endangers the service life of the transformer and poses a great safety hazard

2. When the capacity is switched, all the contacts of the high and low voltage groups are switched synchronously, and the arc is greatly affected by the high current of the low voltage side winding, which makes the dynamic and static contacts easily burned

Images