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Dielectric gelling composition, the use of such dielectric gelling composition, insulated electric dc-cable comprising such gelling composition

A gel composition, dielectric technology, applied in the field of insulating DC cables, electrical insulating oil, manufacturing such DC-cables, dielectric gel compositions, and insulating DC-cables, can solve problems such as voltage increase

Inactive Publication Date: 2001-02-21
ABB (SCHWEIZ) AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the near future, the voltage may also increase

Method used

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  • Dielectric gelling composition, the use of such dielectric gelling composition, insulated electric dc-cable comprising such gelling composition
  • Dielectric gelling composition, the use of such dielectric gelling composition, insulated electric dc-cable comprising such gelling composition

Examples

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Effect test

Embodiment 1

[0051] A gel dielectric composition comprising a mineral oil and a combined gelling agent system was prepared. The gelling agent system comprises polystyrene grafted or adsorbed onto silica particles with a particle size in the nm range. below the transition temperature T t At a temperature of 50-80°C, the polystyrene molecules in the gelling agent system will thus contact each other to form a three-dimensional physical cross-linked network. The bonding in the network is sufficiently strong that the composition is below T t At a temperature of 50°C, it behaves like an elastic or viscoelastic gel. A roll of porous fibrous paper is impregnated with this gel composition, and the gel composition is completely retained within the porous fibrous insulation and between the paper layers at a temperature not exceeding 50°C.

Embodiment 2

[0053] A roll of polypropylene solid film was impregnated with the same gel composition as prepared in Example 1. The gel composition is completely retained between the film layers of the laminated insulation.

Embodiment 3

[0055] A roll of laminated polypropylene-paper sheets, each sheet comprising a paper film and a polypropylene solid film laminated together, was impregnated with the same gel composition as prepared in Example 1. The gel composition is completely retained in the paper portion of the insulation and between laminate layers.

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Abstract

Disclosed is a dielectric gelling composition, exhibiting a thermo-reversible liquid-gel transition at a transition temperature, Tt, wherein the gel comprises an oil and a combined gelator system having molecules of a polymer compound together with fine dielectric particles with a particle size in the nanomneter range, preferably a particle size within the range from 0.001 to 1000 nm, the use of this dielectric gelling composition in an electric device comprising one or more conductors, a casing or enclosure and an insulation system comprising the dielectric gelling composition. An electric DC-cable having a conductor and an electrical insulation comprising a solid part with a porous, fibrous and / or laminated structure impregnated with the dielectric gelling composition and a method for production of such DC-cable wherein the combined gelator is prepared prior to impregnation are also disclosed.

Description

technical field [0001] The present invention relates to a kind of dielectric gel composition, and it comprises a kind of dielectric fluid and a kind of gel additive, especially a kind of wherein has added one or more gel additives, gelling agent, promptly can Electrically insulating oil of compounds that impart gelling behavior to the dielectric fluid. In particular, the present invention relates to a gel composition that undergoes a thermally reversible transition between a high-temperature flowable liquid state and a low-temperature highly viscous elastic gel state, ie, a thermally reversible liquid-gel transition. [0002] In another aspect, the invention relates to the use of such a gel composition as a component of an electrical insulation system in electrical equipment. [0003] In a particular aspect, the invention relates to an insulated direct current cable, ie an insulated DC-cable, with an insulation system comprising such a dielectric gel capable of a thermally re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00C08L51/00C08L101/00H01B3/20H01B9/06H01B13/30
CPCH01B3/20Y10T428/2933Y10T428/2971Y10T428/294Y10T428/2927
Inventor A·科恩菲尔德特J·菲利克斯M·贝里奎斯特P·诺德贝里C·特恩奎斯特T·许特
Owner ABB (SCHWEIZ) AG
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