Polyolefin Cable Insulation Reducing DC Conductivity
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Solution Overview
Problem
High voltage direct current (HV DC) power cables face challenges with electrical conductivity, leading to thermal runaway due to high conductivity of insulating materials, which increases heat generation under stress and temperature conditions, necessitating a reduction in conductivity while maintaining mechanical properties.
Innovation Solution
A polymer composition comprising a polyolefin and an ion exchanger additive, specifically a lamellar anion exchanger, is used to reduce electrical DC conductivity without the need for crosslinking agents, capturing undesirable ionic species and improving mechanical properties for power cable applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulating material with high conductivity is used in HV DC cables, then electrical insulation is provided, but heat generation increases leading to thermal runaway
Solution Approach 1:
The patent changes the electrical conductivity parameter of the insulating material by using polyolefin base materials with inherently low conductivity and minimizing additives that increase conductivity. This parameter change directly reduces heat generation while maintaining electrical insulation functionality
Solution Approach 2:
The patent employs composite material structures combining polyolefin base materials with carefully selected additives in optimized proportions. The composite achieves low conductivity by balancing the insulating properties of polyolefin with the functional requirements of cable insulation, preventing thermal runaway while maintaining reliability
2Object-generated harmful factors
If conductivity is reduced to prevent thermal runaway, then heat generation decreases, but mechanical properties may deteriorate
Solution Approach 1:
The patent optimizes the molecular weight and molecular weight distribution parameters of the polyolefin to achieve both low conductivity and high mechanical strength. By controlling these parameters, the material simultaneously exhibits reduced electrical conductivity (preventing thermal runaway) and enhanced mechanical properties (resistance, elongation)
Solution Approach 2:
The patent uses composite formulations where polyolefin is combined with specific additives that enhance mechanical properties without significantly increasing conductivity. The composite structure allows the base polyolefin to provide low conductivity while additives contribute to mechanical strength and flexibility
3Strength
If crosslinking agents are used to improve mechanical properties, then strength increases, but production complexity increases
Solution Approach 1:
The patent extracts or eliminates the crosslinking agent component from the formulation entirely. By relying on the inherent mechanical properties of high molecular weight polyolefin and optimized additive packages, the solution removes the need for crosslinking chemistry, thereby simplifying the production process while maintaining mechanical strength
Solution Approach 2:
The patent replaces complex crosslinking systems with simpler, non-crosslinking polyolefin formulations that achieve adequate mechanical properties through molecular weight control and additive selection. This substitution uses simpler, more straightforward materials and processes
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 polymer composition achieves low electrical DC conductivity, minimizing heat formation in power cables and maintaining mechanical integrity, suitable for high voltage applications without the need for crosslinking agents, simplifying the production process.
Implementation Method 1
a polymer composition comprising (a) a polymer, and (b) an ion exchanger additive
Data Source
AI summary
The present invention relates to a use of a polymer composition preferably in electrical devices as well as to a cable surrounded by at least one layer including the polymer composition.