Grafted crosslinked polyethylene insulating layer for high voltage direct current cable and preparation method thereof

By introducing the polar group of propylene chloroacetate into the polyethylene molecular chain and combining it with chemical cross-linking methods to prepare a graft-cross-linked polyethylene insulation layer, the problem of space charge accumulation in the traditional insulation layer under a DC high-voltage electric field is solved. It has excellent electrical properties and electrical resistance, and is suitable for the industrial production of high-voltage DC cables.

CN107698711AInactive Publication Date: 2018-02-16HARBIN UNIV OF SCI & TECH
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Patent Information

Application Number
CN201711131360.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2017-11-15
Publication Date
2018-02-16
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

The traditional cross-linked polyethylene insulation layer easily accumulates space charge under DC high-voltage electric field conditions, resulting in distortion of the electric field distribution and aging of the insulation layer, affecting the service life of the cable. Nanocomposites are difficult to apply on a large scale in cable production.

Method used

Using a grafted cross-linked polyethylene insulation layer, the polar group of propylene chloroacetate is introduced into the polyethylene molecular chain, using its deep trap to capture external charges, and combined with chemical cross-linking methods to prepare it under high temperature and high pressure, forming an excellent Insulating layer with space charge suppression properties.

Benefits of technology

It effectively suppresses space charge accumulation, improves breakdown strength and conductivity, extends the service life of the insulation layer, and is suitable for industrial cable manufacturing processes and mass production.

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Abstract

The invention belongs to the field of insulating layers of transmission equipment and particularly relates to a grafted crosslinked polyethylene insulating layer for a high voltage direct current cable and a preparation method thereof. By taking a thermoplastic polyethylene material as a base body, a polyethylene composition containing graftable polar groups can be prepared by proportioning raw materials provided by the invention. After the composition is melted and extruded in an extruder, the composition is chemically crosslinked through a crosslinking pipeline, and small molecules with polar groups are grafted to the molecular chains thereof while a polyethylene material is crosslinked to obtain the grafted crosslinked polyethylene insulating layer, wherein the spatial charge can be inhibited obviously. The polar group grafted crosslinked polyethylene insulating layer provided by the invention is applied to the high voltage direct current cable, so that the problem of charge accumulation in the transmission material under the action of the direct current electric field can be inhibited. The grafted crosslinked polyethylene insulating layer prepared by the preparation method notonly is excellent in spatial load inhibiting property, but also has relatively high direct current disruptive strength and relatively low conductivity.
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