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The pie coil with the neutral point voltage regulating section in the middle

A pancake coil, neutral point technology, applied in the direction of transformer/inductor coil/winding/connection, etc., can solve problems such as increasing cost, reduce loss, simplify coil structure, and avoid the danger of electrical breakdown.

Active Publication Date: 2016-08-10
福州许继电气有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the M-type switch is used for voltage regulation, due to the limitation of the switch structure, the structure of the basic section winding plus an independent voltage regulation winding or the structure of the neutral point reverse voltage regulation is used in the past. Both structures have their inevitable defect, increased cost

Method used

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  • The pie coil with the neutral point voltage regulating section in the middle
  • The pie coil with the neutral point voltage regulating section in the middle
  • The pie coil with the neutral point voltage regulating section in the middle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment one: if Figure 1~3 As shown, a pie-shaped coil with a neutral-point voltage-regulating section in the middle includes a basic section and a voltage-regulating section AV. The voltage regulating section AV is arranged in the middle of the coil, the voltage regulating section AV is connected in series at the end of the basic section, and part or all of the voltage regulating section AV participates in the operation of the transformer.

[0018] In Embodiment 1, the coil is wound on a frame made of struts CT and pads with a flat wire DX, and the number of the struts CT is uniformly distributed from 8 to 8 in the circumferential direction according to the size of the iron cores of the coil. 24 pieces; the two ends of the coil are respectively provided with insulating end coils JD, the ends of the coil are provided with end taps, and the middle part of the coil is provided with taps (1, 2, 3, 4, 5, 6, 7).

Embodiment 2

[0019] Embodiment two: if Figure 4~6 As shown, a pie-shaped coil with a neutral-point voltage-regulating section in the middle includes a basic section and a voltage-regulating section AV. The voltage regulation section AV adopts the parallel structure of the upper voltage regulation section AV1 and the lower voltage regulation section AV2 according to the large current requirements, the voltage regulation section AV is arranged in the middle of the coil, and the voltage regulation section AV is connected in series in the basic section At the end, part or all of the voltage regulating section AV participates in the operation of the transformer.

[0020] In Embodiment 2, the coil is wound on a frame made of struts CT and pads with a flat wire DX, and the number of struts CT is uniformly distributed from 8 to 8 in the circumferential direction according to the size of the iron cores of the coil. 24 pieces; the two ends of the coil are respectively provided with insulating end ...

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Abstract

The invention relates to a novel cake-shaped coil with a neutral point voltage regulating section in the middle. The novel cake-shaped coil comprises a basic section and the voltage regulating section. The basic section is formed by an upper basic section and a lower basic section, wherein the upper basic section and the lower basic section are symmetrically distributed at two ends of the coil and are connected in parallel. The voltage regulating section is arranged in the middle of the coil and is connected to the tail portion of the basic section in series. The voltage regulating section partially or fully participates in running of a transformer. The novel cake-shaped coil eliminates a main empty path between a high-voltage coil and a voltage regulating coil, and improves filling rate in an iron core window. When running voltage of the transformer is lower than rated voltage, the number of turns participating in the operation and the running voltage decrease in direct proportion, and loss of the transformer is reduced. Turns of the voltage regulating section and turns of the basic section linearly and gradually increase and decrease according to geometric positions, abrupt potential difference does not exist, therefore, the coil structure is simplified, the danger of electrical breakdown between the sections is avoided, an oil channel between the sections is decreased, transverse magnetic flux leakage, load loss and axial electric power of the transformer are reduced, and the filling rate in the iron core window is improved.

Description

technical field [0001] The invention relates to a pie-shaped coil with a neutral point voltage regulating section in the middle. Background technique [0002] According to the national standard of 35kV and below, the power transformer adopts Yd11 connection method. When the transformer capacity is greater than 1000kVA, the high and low voltage windings use cake coils. When the M-type switch is used for voltage regulation, due to the limitation of the switch structure, the structure of the basic section winding plus an independent voltage regulation winding or the structure of the neutral point reverse voltage regulation is used in the past. Both structures have their inevitable Defects increase costs. Contents of the invention [0003] The present invention makes improvements to the above-mentioned problems in the prior art, that is, the technical problem to be solved by the present invention is to provide a low-cost pie-shaped coil with a neutral point voltage regulating...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F27/28H01F27/30
Inventor 陈伯根付国武林光莺
Owner 福州许继电气有限公司
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