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High voltage direct current cable having an impregnated stratified insulation

A high-voltage direct current and insulator technology, applied in the direction of insulated cables, insulated conductors, organic insulators, etc., can solve the problems of low-viscosity oil impregnation that is not suitable for overall impregnation of cables

Active Publication Date: 2012-10-03
PRYSMIAN SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The cables disclosed by the above mentioned patents are impregnated with low viscosity oils which are not suitable for impregnating cables in their entirety

Method used

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  • High voltage direct current cable having an impregnated stratified insulation
  • High voltage direct current cable having an impregnated stratified insulation
  • High voltage direct current cable having an impregnated stratified insulation

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0055] 0.025 mm thick, 0.93 g / ml density and 100,000 Gurley seconds air impermeability -1 Two layers of kraft paper (pure conifer cellulose) and one layer of Pro-fax TM Combined with PF611 (Basell), this layer of Pro-fax TM PF611 (Basell) is a propylene homopolymer (PP) with a density of 0.902 g / ml (ASTM D 792) and an MFI of 30.0 g / 10 min (ASTM D 1258) at 230°C / 2.16 kg. The resulting paper / PP / paper laminate had a thickness of 0.100 mm, a PP percentage of 60% by weight and a weight of 100 g / m2. In the dry laminate, the peel strength between PP and paper was measured according to standard ASTM D1876-08 and the result was 13 g / 15 mm.

[0056] The laminate thus obtained was dried under vacuum in a thermostat at 135°C for 8 hours, followed by impregnation at 125°C with an insulating fluid having a viscosity of 1200 cSt at 100°C (commercial product T2015 of H&R ChemPharm (UK) Ltd.) . During the impregnation, the thickness change (swelling) was measured at regular intervals: the...

example 2

[0059] 0.025 mm thick, 0.93 g / ml density and 100,000 Gurley seconds air impermeability -1 Two layers of kraft paper (pure coniferous cellulose) combined with one layer of HD601CF (Borealis) which has a density of 0.90 g / ml (ISO 1183) and an MFI of 8 g / 10 at 230°C / 2.16 kg minutes (ISO 1133) of propylene homopolymer (PP). The resulting paper / PP / paper laminate had a thickness of 0.100 mm, a PP percentage of 60% by weight and a weight of 100 g / m2. In dry laminates, the peel strength between PP and paper was measured according to standard ASTM D 1876-08 and the result was 100 g / 15 mm.

[0060] The laminate thus obtained was dried under vacuum in a thermostat at 135°C for 8 hours, followed by impregnation at 125°C with an insulating fluid having a viscosity of 1200 cSt at 100°C (commercial product T2015 of H&R ChemPharm (UK) Ltd.) . During the impregnation, the thickness change (swelling) was measured at regular intervals: the results are reported in the graph of FIG. 4 . The to...

example 3

[0061] Example 3 (comparison)

[0062] 0.025 mm thick, 1.01 g / ml density and 40,000 Gurley seconds air impermeability -1 Two layers of kraft paper (mixed pine / hardwood pure cellulose) and one layer of Pro-fax TM Combined with PF611 (Basell), this layer of Pro-fax TM PF611 (Basell) is a propylene homopolymer (PP) with a density of 0.902 g / ml (ASTM D 792) and an MFI of 30.0 g / 10 min (ASTM D 1258) at 230°C / 2.16 kg. The resulting paper / PP / paper laminate had a thickness of 0.100 mm, a PP percentage of 60% by weight and a weight of 100 g / m2. In the dry laminate, the peel strength between PP and paper was measured according to standard ASTM D1876-08 and the result was 50 g / 15 mm.

[0063] The laminate thus obtained was dried under vacuum in a thermostat at 135°C for 8 hours, followed by impregnation at 125°C with an insulating fluid having a viscosity of 1200 cSt at 100°C (commercial product T2015 of H&R ChemPharm (UK) Ltd.) . During the impregnation, the thickness change (swel...

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Abstract

The present invention relates to a high voltage direct current (DC) cable comprising: at least one electrical conductor, at least one semiconducting layer, at least one stratified insulation made from windings of at least one paper-polypropylene laminate, said stratified insulation being impregnated with at least one electrically insulating fluid having a kinematic viscosity of at least 1,000 cSt at 60 DEG C, wherein the laminate includes at least one paper layer having an air impermeability of at least 100,000 Gurley sec"1. Such a high air impermeability of the paper layer(s) allows to remarkably reduce the swelling of the polypropylene layer(s) during impregnation with a high viscosity insulating fluid, thus preventing delamination, up to the end of the impregnation process for the whole stratified insulation.

Description

technical field [0001] The present invention relates to high voltage direct current (DC) cables with impregnated layered insulation. In particular, the present invention relates to a high voltage DC cable having a layered insulation made of paper-polypropylene laminate impregnated with an electrical insulating fluid, said cable being suitable for land installations or, preferably, for in underwater facilities. Background technique [0002] For the purposes of this specification and the appended claims, the term "high voltage" means a voltage of at least 35kV. For the purposes of this description and the appended claims, the term "very high voltage" means a voltage of at least 200 kV, preferably a voltage of at least 300 kV. [0003] Electric cables with impregnated layered insulation are known, in which the electrical conductors are electrically insulated by winding a thin tape made of paper or, preferably, a multilayer paper-polyolefin (usually polypropylene) laminate . ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/10H01B3/52H01B3/54H01B7/02H01B9/06
CPCH01B7/0225H01B3/54H01B9/0688H01B3/52
Inventor M·马里塔诺G·米拉蒙蒂
Owner PRYSMIAN SPA
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