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Electric DC-cable with insulation system

A technology for insulators and cables, applied in the direction of insulators, organic insulators, plastic/resin/wax insulators, etc., can solve problems such as inappropriate

Inactive Publication Date: 2001-03-07
ABB (SCHWEIZ) AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing known cross-linked polyethylene compositions used as extruded insulation systems in AC cables have a tendency to accumulate space charge which makes them unsuitable for use as insulation systems in DC cables

Method used

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  • Electric DC-cable with insulation system
  • Electric DC-cable with insulation system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1 comparative test

[0046] Test panels treated with prior art compositions for insulated AC cables and with compositions for insulated DC cables according to the invention were prepared and space charge accumulation trends were assessed by recording space charge shapes using pulsed electroacoustic (PEA) techniques. PEA technology is well known in the art and disclosed by Takada, IEEE Trans. Electr. Insul. Vol. E1-22 (No. 4) pp 497-501 (1987).

[0047] a. Molded at 130° C. into a 2 mm thick polyethylene composition test plate, the composition contains: about 98 wt % of low density polyethylene (922 kg / m 3 ); about 0.4 wt% trade name SANTONOX R  (manufactured by Flexsys Co), its chemical name is 4,4'thio-bis(6-tert-butyl-m-cresol), and 1.6 wt% of cross-linking agent, its trade name is DICUP R  (manufactured by Hercules Chem) The chemical name is dicumyl peroxide.

[0048] Two semiconductor electrodes were molded on the test board...

Embodiment 2

[0060]The compounding of the polyethylene-based resin composition is explained below. MFR is that in the low-density polyethylene of 1.2g / 10min, add following additive:-1.7wt% peroxide dicumyl peroxide crosslinking agent;-0.3wt% compound (D), 2,4-diphenyl base - 4-methyl-1-pentene type anti-scorch agent; and - a total amount of 0.3% by weight antioxidant system consisting of DSTDP type compound (B) distearoyl-thiodipropionate and compound (C), a diester composition of 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid and thiodiglycol. The ratio of compound (B) to (C) is 1:3. The compounded resin composition was extruded with 8mm insulation on shielded stranded stranded wire conductors and crosslinked at a fabrication temperature of 225C for a process time of 5 minutes.

[0061] No appreciable amount of water was detected on the extruded crosslinked insulator.

[0062] No obvious moisture was detected on the extruded cross-linked insulator, because in the system containing...

Embodiment 3

[0067] The compounding of the polyethylene-based resin composition will be described below. The made MFR is that the following additives are added in the low density polyethylene resin of 1.0g / 10min:-1.4wt% dicumyl peroxide type peroxide crosslinking agent;-0.4wt% compound (D), 2 , 4-diphenyl-4-methyl-1-pentene anti-scorch agent; -0.3wt% only consists of compound (C), 3-(3,5-di-tert-butyl-4-hydroxyphenyl ) Antioxidant composed of propionic acid and diester of thiodiglycol. The compounded resin composition was extruded and crosslinked at 300C.

[0068] The tendency for space charge accumulation measured in the present invention is small and greatly reduced compared to the space charge accumulation typically detected in conventional extruded crosslinked polyethylene based compositions for use in AC cables. Therefore, the cable is considered suitable for use as a DC cable.

[0069] It is also found that the amount of peroxide crosslinking agent remaining in the cable insulatio...

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Abstract

An insulated DC-cable and method for production of an insulated DC-cable with an insulating system comprising an extruded cross-linked polyethylene based insulation disposed around the conductor. The extruded polyethylene based compound comprises additives such as cross-linking agent, scorch retarding agent and antioxidant. The scorch retarding agent comprises a compound (D), 2,4-diphenyl-4-methyl-pentene-1 and the antioxidant comprises a compound (C), a diester of 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionicacid and thiodiglycol. The compounded polyethylene based resin composition is extruded and cross-linked at a temperature and for a period of time sufficient enough to cross link the insulation. The temperature and the period of time upon extrusion and cross-linking are limited so as to substantially suppress or essentially avoid undesired polar by-products being formed in the cross-linked composition.

Description

technical field [0001] The invention relates to an insulated DC cable with a current- or pressure-carrying entity, a DC cable (DC cable), ie a conductor, and an insulation system around the conductor, wherein the insulation system comprises an extruded crosslinked polyethylene composition. [0002] The invention specifically relates to an insulated DC cable for power transmission and distribution in a power station. Extruded insulation systems include multiple layers, eg, a semiconducting inner shield, insulation and a semiconducting outer shield. The extruded insulation comprises at least an electrical insulating composition based on crosslinked polyethylene with a series of additives such as crosslinking agents, antiscorch agents and antioxidants. Background technique [0003] Although many of the first power supply systems for power transmission and distribution in power stations were based on DC technology, these DC systems are rapidly being replaced by alternating curr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K5/01C08K5/134C08K5/375H01B3/44H01B9/00
CPCC08K5/1345C08K5/01H01B3/441C08K5/375C08L23/04H01B3/44
Inventor P·卡斯滕森A·古斯塔夫松A·法卡斯A·艾利松J·O·波斯特伦B·古斯塔夫松U·尼尔松F·坎普斯
Owner ABB (SCHWEIZ) AG
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