On-load voltage and capacitance regulation transformer

Abstract

An on-load voltage and capacitance regulation transformer comprises a tap switch and other components. The tap switch is composed of three operating mechanisms, three capacitance regulation switches and two voltage regulation switches. Each operating mechanism is provided with a bistable permanent magnet assembly and a poking rod of the bistable permanent magnet assembly. Each switch comprises a sealed vacuum insulating cylinder. All switching surfaces of movable contact pieces and static contact pieces are located inside vacuum cylinder cavities of the insulating cylinders. The width of the switching surfaces of the high-voltage side static contact pieces in the three capacitance regulation switches is smaller than the width of the switching surfaces of the low-voltage side static contact pieces in the three capacitance regulation switches. Due to the fact that the switching surfaces of the movable and static contact pieces are located inside the vacuum cylinder cavities, the on-load voltage and capacitance regulation transformer has the advantages that arc extinguishing performance is reliable, the service life is long and transformer oil is not polluted by electric arcs; in addition, after the technology that a high-voltage winding and a low-voltage winding are cut off in sequence, and the low-voltage winding and the high-voltage winding are connected in sequence is adopted, the small electric arcs are obtained, residual magnetism inside an iron core of the transformer is eliminated, inrush current and overvoltage formed when the high-voltage winding is connected again are avoided, and the voltage fluctuation amplitude in the switching process is effectively reduced.

Description

Technical field [0001] The invention relates to an on-load voltage 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 and low voltage coil, an automatic controller, and 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-adjusting and voltage-adjusting transformer, the transformer shell is filled with oil, and the tap changer and coil are immersed in the transformer oil. In operation, when the automatic controller connected to the bistable permanent magnet component of the tap switch receives the electrical signal related to the capacity and voltage regulation, the output circuit of its execution module is triggered to start the correspondingly connected capacity and voltage regulation switch Action, control the dynamic and static contact ...

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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