An on-load voltage regulating and capacity regulating transformer

Abstract

An on-load voltage regulating and capacity regulating transformer, including tap changer and other components, the tap changer is composed of three sets of operating mechanisms, three capacity regulating switches and two voltage regulating switches, and each operating mechanism has a set of bistable permanent magnets The component and its toggle rod, and the switch each include 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 high-voltage side static contact of the three capacity adjustment switches The width of the switching face of the slice is smaller than that of the low voltage side. Since 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 the low-voltage winding is connected first, and then the high-voltage winding is connected, the arc is small, which is beneficial to eliminate the residual magnetism in the transformer core, avoids the inrush current and overvoltage when the high-voltage side winding is connected again, and effectively reduces the voltage fluctuation amplitude during the switching process value purpose.

Description

technical field [0001] The invention relates to an on-load voltage regulating and capacity regulating transformer. Background technique [0002] The structure of the existing capacity-regulating and voltage-regulating transformer usually includes a transformer housing, a high-voltage and low-voltage coil, an automatic controller, and structural components such as a tap switch composed of an operating mechanism, a capacity-regulating switch and a voltage-regulating switch. There is a type of on-load capacity regulating transformer, the transformer shell is filled with oil, and the tap changer and coil are immersed in the transformer oil. During operation, when the automatic controller connected to the bistable permanent magnet component of the tap changer receives an electrical signal related to capacity and voltage regulation, the output circuit of its execution module is triggered, so that the correspondingly connected capacity and voltage regulation switch starts The acti...

AI Technical Summary

Problems solved by technology

Before the present invention was made, the problems existing in this type of on-load capacity-adjusting voltage-regulating transformer were: 1. During the process of capacity-adjusting and voltage-regulating, the electric arc generated by the switching of the moving and static contacts would pollute the arc-extinguishing medium transformer oil, causing the transformer The insulation performance of the oil decreases rapidly, 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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