Transformer with zero sequence filtering function

Abstract

The invention relates to a transformer, particularly to a transformer used for an AC power supply and provided with a zero sequence wave filtering function, and provides a transformer of a zero sequence wave filter, which is provided with an amorphous power transformer and capable of filtering zero sequence wave. The invention can greatly reduce the dead time loss of a distribution transformer so as to energy resource, and can filter zero sequence wave. The invention comprises a transformer which is an amorphous power transformer. A pure sensing zero sequence wave filter is connected to the amorphous power transformer and comprises a linear reactance and a wave filtering reactance. The invention not only can greatly reduce the dead time loss of the distribution transformer, thereby saving energy source, but also provides a simple and efficient technical proposal which can solve the zero sequence harmonic current problem and generate no interference for an AC power grid, where the transformer is installed.

Description

technical field [0001] The invention relates to a transformer, in particular to a transformer with zero-sequence filtering function used in an AC power supply. Background technique [0002] At present, most of the domestic transformer manufacturers have noticed the harmfulness of zero-sequence harmonics. The distribution transformers they produce (whether oil transformers or dry transformers) have been in line with the international market, and they have adopted the method of filtering zero-sequence harmonics. One of the most commonly used measures is: make the load side of the power transformer into a delta connection structure, including: Δ| and Y| two connection methods, when the zero-sequence harmonics generated by the nonlinear load enter the transformer Finally, because the delta connection is adopted on the load side of the transformer, the zero-sequence harmonic current forms a circulating current in the transformer, thereby effectively weakening the harmonics and se...

AI Technical Summary

Problems solved by technology

LC circuit, the connection method and circuit are very complicated, and it is difficult to match the device

Although the power transformer connected in delta connection on the load side can effectively filter out the zero-sequence harmonics, the circulating current formed by the zero-sequence harmonics in the transformer will also increase the loss on the winding and core of the transformer. It will cause additional loss and increase the temperature of the winding, and the higher zero-sequence harmonic frequency will increase the magnetic loss and eddy current loss

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