Large three-phase power transformer demagnetizing coil structure

Abstract

The invention relates to a large three-phase power transformer demagnetizing coil structure, and belongs to the technical field of transformer equipment. The technical scheme is as follows: the largethree-phase power transformer demagnetizing coil structure comprises a first demagnetizing coil (1), a second demagnetizing coil (2) and a third demagnetizing coil (3), wherein the first demagnetizingcoil (1), second demagnetizing coil (2) and third demagnetizing coil (3) have the same winding direction and winding turns, the first demagnetizing coil (1) is arranged on an upper iron yoke at the middles of an A phase column (40 and a B phase column (5) of a transformer, the second demagnetizing coil (2) is arranged on an upper iron yoke at the middles of the B phase column (5) and a C phase column (6) of the transformer, and the third demagnetizing coil (3) is arranged on an upper iron yoke between the C phase column (6) of the transformer and a side pillar. The large three-phase power transformer demagnetizing coil structure provided by the invention has the beneficial effects that the demagnetizing coils are arranged on the iron core of the transformer, so that the main flux distribution of the whole iron core is improved, and at last the main flux is uniformly distributed in the iron core.

Description

technical field [0001] The invention relates to a large-scale three-phase power transformer degaussing coil structure, belonging to the technical field of transformer equipment. Background technique [0002] In large-scale three-phase power transformers, in order to consider the transportation limit, three-phase five-column iron cores are often used. However, since the magnetic potential and angle of each frame of the iron core are different, and the magnetic resistance of each frame is also different, resulting in the The main magnetic flux distribution of the upper and lower yokes and side columns is not equal (the size and angle are not the same); and in the three-phase five-column independent four-frame core, this phenomenon becomes more serious; so in the design, it is often necessary to add Larger iron yoke cross section and smaller side column cross section are used to change the reluctance of each frame to achieve the effect of improving main magnetic flux distributi...

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Problems solved by technology

[0003] However, this method consumes a lot of materials, and because the magnetic potential and magnetic resistance are very different, it cannot guarantee the complete balance of the main magnetic flux distribution; The manufacturability in the process is poor, and the material utilization rate is also poor; for the same reason, it also brings certain difficulties to the design of the core laminations

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