Power Cable Resin Composition for Space Charge Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing DC power cables face challenges in maintaining stable insulation properties due to space charge accumulation, which is exacerbated by the use of inorganic fillers that cause mesh clogging and modified polyolefins that gelate during high-temperature processing, leading to degraded insulation properties.
Innovation Solution
A resin composition comprising polyolefin, a styrene-based elastomer, and a copolymer with styrene and maleic anhydride units, where the copolymer does not contain side chains eliminated by pyrolysis or hydrolysis at 300°C or less, ensuring a minimum content of the copolymer and maleic anhydride units to trap space charges effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic fillers are used to improve insulation properties, then insulation stability is improved, but mesh clogging occurs during processing
Solution Approach 1:
The patent removes inorganic fillers from the resin composition entirely, using only organic components (polyolefin, styrene-based elastomer, and copolymer with maleic anhydride units) to achieve the desired insulation properties without causing mesh clogging during processing
Solution Approach 2:
The patent creates a composite resin system combining polyolefin base resin with styrene-based elastomer and copolymer containing maleic anhydride units, achieving both processing ease and insulation stability through organic material compatibility
2Reliability
If modified polyolefin is used to improve insulation properties, then insulation stability is improved, but gelation occurs during high-temperature processing
Solution Approach 1:
The patent eliminates modified polyolefin from the composition, using unmodified polyolefin base resin combined with styrene-based elastomer and copolymer to achieve insulation stability without gelation during high-temperature processing
Solution Approach 2:
The patent changes the chemical composition parameters by introducing copolymer with maleic anhydride units and styrene-based elastomer in specific ratios, achieving insulation stability through compositional adjustment rather than polyolefin modification
3Reliability
If copolymer with side chains is used to trap space charges, then space charge accumulation is reduced, but side chains are eliminated by pyrolysis or hydrolysis at 300°C or less
Solution Approach 1:
The patent specifies that the copolymer should not contain side chains that are eliminated by pyrolysis or hydrolysis at 300°C or less, ensuring thermal stability of the copolymer structure while maintaining space charge trapping capability through maleic anhydride units
Solution Approach 2:
The patent adjusts the copolymer selection criteria to exclude unstable side chains, changing the chemical parameter requirements to ensure both space charge control and compositional stability at processing temperatures
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The resin composition achieves stable insulation properties with improved volume resistivity, reduced space charge accumulation, and enhanced heat resistance, enabling reliable DC power transmission.
Implementation Method 1
a copolymer containing styrene units and maleic anhydride units... the total content of the maleic anhydride units is set to 0.1 parts by mass or more... to trap space charges effectively
Data Source
AI summary
A resin composition includes a base resin containing polyolefin, a styrene-based elastomer containing styrene units, and a copolymer containing styrene units and maleic anhydride units, wherein a content of the copolymer is 0.5 parts by mass or more with respect to the total content of the base resin and the styrene-based elastomer being 100 parts by mass, a content of the styrene-based elastomer is equal to or more than the content of the copolymer, and the copolymer does not contain side chains that are eliminated by pyrolysis or hydrolysis at 300° C. or less.