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Transformer

A technology for power transformers and high-voltage windings, applied in transformer/inductor components, transformer/inductor coils/windings/connections, electrical components, etc., can solve problems such as coil optimization, avoid thermal damage, reduce inductance, reduce Effect of coil short-circuit force

Inactive Publication Date: 2004-11-24
ABB (SCHWEIZ) AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Coils must be distributed and proportional to provide some tolerance for error, therefore, coils are not designed for optimal performance in normal operation

Method used

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Experimental program
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Effect test

Embodiment Construction

[0039] image 3 is a sectional view through the winding portion inside the transformer core 22 of a power transformer according to the present invention. A layer of low voltage winding 26 is placed between two layers of high voltage winding 28 . The transformation ratio of this embodiment is 1:2.

[0040]The direction of current flow in the low voltage winding 26 is opposite to the direction of current flow in the high voltage winding 28, so the forces generated by the current flow in the low voltage and high voltage windings partially cancel each other out. This greatly reduces the effect of current-induced forces, which is especially important in the event of a short circuit.

[0041] A post 27 of laminated magnetic material including a spacer 29 to provide an air gap is located between the windings 26, 28 to improve the efficiency of the transformer.

[0042] If the turns of the low-voltage winding are separated into many turns connected in parallel, and it is best to ma...

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Abstract

A power transformer comprising at least one high voltage winding (32) and one low voltage winding (30). Each of the windings includes at least one currentcarrying conductor, a first layer having semi-conducting properties provided around said conductor, a solid insulating layer provided around said first layer, and a second layer having semi-conducting properties provided around said insulating layer. The windings are intermixed such that turns of the high voltage winding are mixed with turns of the low voltage winding.

Description

technical field [0001] The invention relates to a power transformer comprising at least one high voltage winding and one low voltage winding. Background technique [0002] The term "power transformer" mentioned here is such a transformer whose rated output ranges from hundreds of KVA to more than 1000MVA, and its rated voltage is from 3-4KV to very high transmission voltage, such as 400-800KV or higher . [0003] in e.g. [0004] A.C. Franklin and D.P. Franklin, "The J & P Transformer Book, [0005] A Practical Technology of the Power Transformer″, Published [0006] By Butterworths, 11th edition, 1990. [0007] Conventional power transformers are described in . [0008] In e.g. H.P.Moser, "Transformerboard, Die Verwendung von [0009] Transformerboard in Grossleistungstransformatoren″, [0010] published by H. Weidman AG, Rapperswil mit [0011] Gesamtherstellung: Birkhauser AG, Basle, Switzerland. [0012] Issues with internal electrical insulation and related top...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F27/28H01F27/32
CPCH01F27/2823H01F27/323H01F27/288H01F27/32
Inventor T·许特P·霍姆贝里J·布兰格费尔特C·萨瑟P·卡斯滕森
Owner ABB (SCHWEIZ) AG