Voltage-regulating capacitance-regulating tap switch adopting vacuum arc-extinguishing chambers

Abstract

A voltage-regulating capacitance-regulating tap switch adopting vacuum arc-extinguishing chambers comprises a capacitance regulating switch set and a capacitance regulating operation mechanism. The capacitance regulating switch set comprises three high-voltage double-break vacuum arc-extinguishing chambers and six low-voltage double-break vacuum arc-extinguishing chambers, the three high-voltage double-break vacuum arc-extinguishing chambers are connected with a tap contact of a transformer high-voltage side winding, and therefore conversion of star connection and triangular connection of the high-voltage side winding is achieved. The six low-voltage double-break vacuum arc-extinguishing chambers are connected with tap contacts of transformer low-voltage side windings, and therefore conversion of series connection and parallel connection of the low-pressure side windings is achieved. The tap switch further comprises two voltage regulating switch sets and a voltage regulating operation mechanism, each voltage regulating switch set comprises three double-break vacuum arc-extinguishing chambers and a voltage regulating mechanism, the three double-break vacuum arc-extinguishing chambers of each voltage regulating switch set are connected with tap contacts of a high-gear winding, an intermediate-gear winding and a low-gear winding of a transformer coil high-voltage side respectively, and therefore voltage regulation of a transformer is achieved. The voltage-regulating capacitance-regulating tap switch has the advantages of being high in safety, small in size, easy to mount and convenient to operate.

Description

technical field [0001] The invention relates to the technical field of electric switches, in particular to a tap changer for voltage regulation and capacity regulation using a vacuum interrupter. Background technique [0002] In the power supply and distribution system, the number of transformers is large, the capacity is large, and the total loss is very large, accounting for about 10% of the total power generation. Transformer loss is the sum of no-load loss and on-load loss. The no-load loss of a transformer is fixed, generally accounting for 6% of the transformer capacity. Because the selection of transformer capacity is based on the highest load, and a certain margin must be left, when the transformer is operating at a large load rate or full load, the loss is the largest at this time, which is unavoidable, but when the load decreases, due to The transformer capacity is fixed, and its no-load loss is constant, so there is a lot of waste, especially in some occasions wh...

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Problems solved by technology

[0007] The problem existing in the existing vacuum tap changer is that the contact parts of the static contacts used to connect the three-phase taps of the transformer windings A, B and C are jointly packaged in a vacuum cavity, and the arc generated during switching makes the contacts The head material is vaporized, and after cooling, its metal particles are randomly adsorbed on the inner wall of the vacuum container. As the metal particles on the inner wall of the vacuum container accumulate more and more, it will inevitably cause phase-to-phase insulation breakdown, causing phase-to-phase short circuit and causing accidents. , when the vacuum degree in the vacuum container is reduced, the insulation capacity will also cause phase-to-phase short circuit accidents

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