Voltage-regulating and capacity-adjusting tap-changer with vacuum interrupter

Abstract

The tap-changer for voltage regulation and capacity regulation using vacuum interrupter includes a capacity regulation switch group and a capacity regulation operating mechanism. The capacity regulation switch group includes three high-voltage double-break vacuum interrupters and six low-voltage double-break vacuum interrupters. Three high-voltage double-break vacuum interrupters are respectively connected to the tap contacts of the high-voltage side winding of the transformer, so as to realize star connection and delta connection conversion of the high-voltage side winding; six low-voltage double-break vacuum interrupters are connected to the transformer low-voltage side winding respectively The tap contacts are connected to realize the series and parallel conversion of the low-voltage side winding; the tap changer also includes two voltage regulating switch groups and a voltage regulating operating mechanism, and each voltage regulating switch group includes three double-break vacuum interrupters and A voltage regulating mechanism and three double-break vacuum interrupters are respectively connected to the high, medium and low winding tap contacts on the high voltage side of the transformer coil, so as to realize the voltage regulation of the transformer. The invention has the characteristics of high safety, small size, simple installation and convenient operation.

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...

AI Technical Summary

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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