On-load voltage regulating and capacitance regulating tapping switch

Abstract

An on-load voltage regulating and capacitance regulating tapping switch comprises three operating mechanisms, three capacitance regulating switches and two voltage regulating switches, each operating mechanism is provided with a bi-stable state permanent magnet assembly and a poking rod of the bi-stable state permanent magnet assembly, each switch comprises a sealed vacuum insulating cylinder, and the switching surfaces of movable contacts and static contacts are located in vacuum cylinder cavities of the insulating cylinders; the width of the switching surface of the static contacts on the high voltage sides of the three capacitance regulating switches is smaller than that of the switching surface of the static contacts on the low voltage sides. As the switching surfaces of the movable contacts and the static contacts are located inside the vacuum cylinder cavities, the on-load voltage regulating and capacitance regulating tapping switch has the advantages that the arc extinguishing performance is reliable, the service life is long and oil of a transformer is not polluted by electric arcs; besides, the technology that a high-voltage winding is cut off firstly, then a low-voltage winding is cut off, the low-voltage winding is switched on, and then the high-voltage winding is switched on is adopted, so that the electric arcs are small, residual magnetism inside an iron core of the transformer is eliminated conveniently, flashy flow and overvoltage generated when the high-voltage winding is switched on again are avoided, and the voltage fluctuation amplitude is effectively reduced in the switching process.

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 switches,...

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

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