Transformer DC magnetic bias inhibition system
A technology of DC bias suppression and DC bias, applied in the direction of transformer/inductor coil/winding/connection, preventing/reducing unwanted electric/magnetic influence, electrical component structure association, etc., can solve problems such as weakening, Achieve the effect of eliminating influence, strong anti-electromagnetic interference ability and low cost
Active Publication Date: 2016-02-17
CHINA ELECTRIC POWER RES INST +2
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[0006] The above methods mainly focus on installing additional devices on the neutral point of the transformer, so as to weaken or block the DC current at the neutral point of the transformer. There is not much research on changing the structure of the transformer itself to reduce the DC bias effect.
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[0028] In order to better understand the present invention, the content of the present invention will be further described below in conjunction with the accompanying drawings and examples.
[0029] The structure of the transformer DC bias suppression system provided by the present invention is as follows: figure 1 As shown: the transformer includes a closed rectangular frame-shaped iron core composed of vertical iron core columns 2 on both sides connected with upper and lower horizontal iron yokes 5, and primary iron core columns respectively wound on the vertical iron core columns on both sides Composed of winding 1 and secondary winding 8, the transformer is a three-phase air-cooled transformer, and the connection groups of primary winding 1 and secondary winding 8 of the transformer are YNd11.
[0030] The DC bias suppression system includes a magnetic flux detection sensor 4 arranged on one of the two horizontal iron yokes 5 of the transformer and a DC bias suppression win...
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The invention provides a transformer DC magnetic bias inhibition system. A transformer comprises a closed rectangular frame shaped iron core formed by connecting vertical iron core columns on two sides, and an upper horizontal yoke and a lower horizontal yoke, and a primary winding and a secondary winding respectively winded on the vertical iron core columns on two sides. The system comprises a flux detection sensor which is arranged on one of the two horizontal yokes, and a DC magnetic bias inhibition winding whose winding direction is opposite to the winding direction of the primary winding. The flux detection sensor is connected with the DC magnetic bias inhibition winding through a control system. The structure of the technical scheme is simple and reliable, and influence of DC magnetic bias on safe and stable operation of a transformer can be eliminated.
Description
technical field [0001] The invention relates to a DC bias suppression system, in particular to a transformer DC bias suppression system. Background technique [0002] With the implementation of the power grid strategy of "power transmission from west to east, mutual supply between north and south, and national networking", ultra-high voltage direct current transmission (HVDC) technology suitable for high-power and long-distance transmission has been more and more widely used. Using DC transmission technology for long-distance power transmission can improve the economy, stability and scheduling flexibility of power system operation, and has broad development prospects. [0003] However, in actual operation, it is found that when the DC transmission system operates in a single-pole ground loop mode, it is easy to cause DC bias phenomena in the transformers of the surrounding AC substations, and DC bias phenomena in the converter transformers will also occur. The geomagnetic i...
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IPC IPC(8): H01F27/38H01F27/30H01F27/40
Inventor邱进王晓琪吴士普陈江波徐思恩费烨毛安澜陈晓明汪本进冯宇王玲杜砚李璿余春雨周翠娟朱丝丝黄琴
OwnerCHINA ELECTRIC POWER RES INST