Method for remarkably reducing impulse voltage gradient of regulating winding of auto-transformer

Abstract

The invention provides a method for remarkably reducing the impulse voltage gradient of a regulating winding of an auto-transformer. The regulating winding of the auto-transformer is divided into a first half regulating winding and a second half regulating winding, which are electrically connected in series, so that the electrical strength of the whole regulating winding adopting serial connection is twice that of a regulating winding adopting parallel connection, and the impulse voltage gradient of adjacent turns inside the regulating winding is greatly reduced. The method overcomes the disadvantages of the prior art and can remarkably reduce the impulse voltage gradient of the adjacent turns of the regulating winding of the auto-transformer, so that the overall development cost of the transformer is reduced and the overall reliability of the transformer is greatly enhanced.

Description

technical field [0001] The invention relates to the technical field of oil-immersed self-coupling transformers, in particular to a self-coupling transformer with a voltage-regulating winding whose head end of a high-voltage winding adopts a middle outlet mode. Background technique [0002] For the self-coupling transformer whose head end of the high-voltage winding adopts the middle outlet method, because the head end is drawn from the middle of the high-voltage winding and must pass through the outer voltage regulating winding, the voltage regulating winding will be divided into upper and lower parts, such as figure 1 As shown, low-voltage winding 1, medium-voltage (common) winding 2, and high-voltage (series) winding 3 are arranged sequentially from the inside out. The upper and lower parts, that is, the upper half of the voltage regulating winding 4 and the lower half of the voltage regulating winding 5. figure 2 Schematic diagram for the winding wiring. The traditiona...

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Problems solved by technology

The former is because the voltage regulating winding adopts the tangled winding method, the wires are inevitably welded, and there are many welding points. A little careless handling will easily form partial discharge points. For some voltage regulating windings with very high gradient voltage, even through tangled The way of winding cannot solve the problem; the latter increases the cost of the transformer and the complexity of operation because of the addition of lightning arresters inside the transformer. On the other hand, because the reliability of the lightning arresters themselves cannot be guaranteed, many The user also does not accept the method of limiting the overvoltage of the winding by installing an arrester

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