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Pressing of transformer windings during active part drying

A technology for transformers and transformer cores, applied in transformer/inductor parts, transformer handling devices, magnetic core manufacturing, etc., can solve problems such as complexity, time-consuming, and loss of winding stabilization effect.

Inactive Publication Date: 2014-04-16
ABB RES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] A problem with both methods is that complex and time-consuming processes are used for the manufacture of transformers
Another problem is that part of the stabilizing effect of the windings is lost during the subsequent work to assemble the windings onto the transformer and during the drying of the movable parts of the transformer

Method used

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  • Pressing of transformer windings during active part drying
  • Pressing of transformer windings during active part drying
  • Pressing of transformer windings during active part drying

Examples

Experimental program
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Effect test

Embodiment Construction

[0024] figure 1 Illustrated is the pressing of the movable part of the transformer, ie the pressing of the windings mounted to the transformer core, according to one embodiment of the invention. figure 1 A three-phase transformer core 101 is shown having three legs 108, 108', 108" each coaxially mounted with a set of windings 102, 102', 102". In addition, an upper core clamp 103a and a lower core clamp 103b are mounted to the core to stabilize the core and hold the core together. Core clamps are further used to help apply individual clamping pressures to the respective winding sets 102, 102', 102". During the drying of the movable parts of the transformer, the upper and lower platens 104a, 104a', 104a " and 104b, 104b', 104b" are respectively arranged to apply individual pressures to the respective winding sets, and to control the drying of the winding sets 102, 102 after the transformer is to be transported and when the transformer is in operation. ', cl...

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Abstract

The present invention relates to a method and arrangement for pressing of windings assembled onto a transformer. The method comprises applying pressing force on the windings, and controlling the pressing force on the windings during drying of transformer active part. Thus, before the drying process commences, the windings are assembled onto the transformer core and pressing force is applied to the windings assembled onto a respective transformer core limb, wherein an individual pressing force is applied to the respective winding. This individual pressing force applied to the respective winding is then controlled during the process of drying the transformer active part. The windings will as a result advantageously be effectively compressed onto the core and stabilized.

Description

technical field [0001] The present invention generally relates to a method and apparatus for pressing windings assembled to transformers. Background technique [0002] It is important that the transformer windings are well clamped and secured during transport to site and subsequent operation. To achieve this, the windings are axially compressed and clamped in place on the transformer core after the transformer movable parts have dried. Since the cellulose insulation of the winding must be kept away from moisture, it is guaranteed to be dry. Moisture in the winding insulation deteriorates the operation of the transformer; firstly the cellulose-coated winding dimensions change as the moisture leaves the cellulose material. Second, the material may partially lose its insulating properties, causing subsequent electrical problems in the transformer. [0003] However, despite the dryness of the movable parts of the transformer, the clamping force applied to the pressure plates ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F27/00
CPCH01F27/002H01F27/306H01F41/0206Y10T29/5313Y10T29/49073
Inventor J·安杰U·加夫维特O·格兰达D·戈兰森Z·卡布拉吉克
Owner ABB RES LTD
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