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Design method of high tension coil of dry on-load coarse and fine voltage regulation transformer

A high-voltage coil, coarse and fine adjustment technology, applied in the direction of transformer/inductor coil/winding/connection, transformer, variable transformer, etc., can solve problems such as large impedance voltage deviation, difficult control of partial discharge, large transverse magnetic flux leakage, etc.

Inactive Publication Date: 2012-06-06
XIAN TIANHONG ELECTRIC
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Problems solved by technology

When using the existing upper and lower two-section central voltage regulation structure to realize coarse and fine voltage regulation, the two middle sections are continuously wound and disconnected in the middle, and the interlayer voltage between the gear tap taps will vary with the on-load tap-changer. The corresponding partial discharge amount is difficult to control; when the number of adjustment steps is large, the tap tap is close to the deep layer of the coil, and a large transverse flux leakage channel is formed in the axial direction, causing a large transverse flux leakage , leading to a large deviation of impedance voltage under non-rated tapping

Method used

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  • Design method of high tension coil of dry on-load coarse and fine voltage regulation transformer
  • Design method of high tension coil of dry on-load coarse and fine voltage regulation transformer
  • Design method of high tension coil of dry on-load coarse and fine voltage regulation transformer

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Embodiment Construction

[0018] The present invention will be further described now in conjunction with accompanying drawing, wherein figure 2 and image 3 What is described is that its rated capacity is 1250kVA, its rated high voltage is 11kV, and its voltage regulation range is -15~+5%. ×1.25%kV high-voltage coil, the coil is wound with polyimide enameled wire, the thickness of the paint film is 0.16mm, the thickness of the inner and outer envelope insulation of the coil is 3mm, and the vacuum resin is poured and then cured and formed.

[0019] Such as figure 2 As shown, it is different from the conventional two-stage and four-stage voltage regulation structure with a voltage level of 10kV (see figure 1 ), this example uses a six-section structure, and is divided into normal turns zone 1, coarse turns zone 2, fine turns zone 3 and normal turns zone 4. Between the normal turns area 1 and 4, a coarse turn area 2 and a fine turn area 3 are connected in series. The coarse-tuning turns area 2 and ...

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Abstract

The invention relates to a design method of a high tension coil of a dry on-load coarse and fine voltage regulation transformer, at least comprising normal turn number zones (1, 4) of a high tension coil and an air passage (5). The invention is characterized in that a coarse tuning turn number zone (2) and a fine tuning turn number zone (3) are connected in series between the normal turn number zones (1, 4), and the coarse tuning turn number zone (2) and the fine tuning turn number zone (3) are in forward direction serial connection structure. The coil has strong practicality and high reliability. The method adjusts voltage within a larger range in the mode of combining coarse tuning with the fine tuning.

Description

technical field [0001] The invention relates to a design method of an on-load voltage-regulating transformer, in particular to a design method of a high-voltage coil of a dry-type cast thickness on-load voltage-regulating transformer. Background technique [0002] At present, the common dry-type cast on-load tap-changing transformers in China are all linear voltage-regulating methods, and the maximum number of voltage-regulating stages is 9, such as figure 1 As shown, the high-voltage coil is a segmented cylindrical middle pressure regulating structure, which is divided into upper and lower sections, with a break point in the middle, and the gear taps are drawn out from the break point, and the upper and lower sections are switched in turn. The tap connection is used to connect different turns in series to achieve the purpose of changing the voltage. When using the existing upper and lower two-section central voltage regulation structure to realize coarse and fine voltage r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F27/28H01F29/02
Inventor 安志强付银仓段新选梁霞马飞吕康博
Owner XIAN TIANHONG ELECTRIC
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