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transformer insulation

A technology of transformers and insulators, applied in transformer/inductor magnetic cores, transformer/inductor cooling, transformer/inductor components, etc., can solve problems such as halving the life of paper insulation

Active Publication Date: 2019-05-10
HITACHI ENERGY SWITZERLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, for each temperature rise of 6 to 8 °C, the thermal deterioration of the paper is proportional to its moisture content, and the life of the paper insulation is halved

Method used

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Embodiment Construction

[0033] The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which certain embodiments of the invention are shown. However, this invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; The range fully conveys to those skilled in the art. Like numbers denote like elements throughout the specification.

[0034] Paschen's law is an equation that gives the breakdown voltage, ie, the voltage required to start a discharge or arc between two electrodes in a gas as a function of pressure and gap length. Within the contemplation of the present disclosure, the interstitial length is the smallest diameter of any pores / voids / channels within the composite material. The voltage required to induce an arc decreases as the gap size decreases, but only up to a point. As the gap decreases further, the voltage required to cause the arc increases again. The Paschen...

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Abstract

The present invention relates to an electrical transformer comprising an electrical insulator and a winding of an electrical conductor surrounding a core, said insulator being formed from a substantially non-porous composite material comprising a resin matrix and surrounded by a resin matrix. Winding up to 85% by weight of insulating fibers, the composite material has a maximum moisture content of less than 0.5% by weight at 23°C and a relative humidity of 50%.

Description

technical field [0001] The invention relates to an electrical transformer comprising an electrical insulator and a winding of an electrical conductor surrounding a core. Background technique [0002] In different parts of electrical transformers, insulating materials are used to avoid arcing etc. The insulating material is typically cellulose based since such paper or pressboard materials are inexpensive and easy to handle while imparting sufficient insulation. Examples of insulators in oil filled transformers are: [0003] Spacers, which are positioned between the coils / disks of the winding, allow oil to circulate between them. [0004] Axial rods, which are positioned between the windings and the core, or between different windings. [0005] A cylinder positioned around a winding, between a winding and its core, or between different windings. [0006] A winding table, positioned on top of and below the plurality of windings, supports the windings. [0007] The insulat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F27/32
CPCH01B3/47H01F27/32Y10T29/49021H01F27/14B29C45/0005H01F27/24H01F27/2823H01F41/00B29K2101/12B29K2309/00B29K2105/12B29L2031/3412B29K2995/0007
Inventor A·米查里克P·里科特斯M·卡米格诺托J·亚达瓦R·赞诺M·赫卡A·马托兹C·皮托伊斯E·洛加基斯H·马蒂尼S·伊拉里奥O·吉兰达R·维图伊斯S·特扎瓦拉斯
Owner HITACHI ENERGY SWITZERLAND AG