Elastomeric Insulation Material for High-Voltage Stress Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing polymer insulators for high-voltage electrical power cables suffer from low electrical stress tolerance, high dissipation factor, and unstable dielectric characteristics, leading to issues such as partial discharge and corona discharge, and are prone to chemical deterioration.
Innovation Solution
An elastomeric material comprising high structure carbon black and inorganic fillers like barium titanate or titanium dioxide is developed, which enhances electrical stress tolerance, maintains low dissipation factor, and provides high permittivity, suitable for high-voltage applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional polymer insulators are used for high-voltage cable insulation, then the material provides basic insulation properties, but the electrical stress tolerance is low and dielectric characteristics are unstable
Solution Approach 1:
The patent applies composite materials by combining elastomeric base material with inorganic fillers (alumina tri-hydrate, silica, barium titanate, strontium titanate) and carbon black. This composite structure provides both high electrical stress tolerance through the dielectric properties of inorganic fillers and stable dielectric characteristics through the synergistic interaction of multiple components, resolving the contradiction between reliability and compositional stability.
Solution Approach 2:
The patent utilizes parameter changes by carefully controlling the volume percentages of different fillers (5-50% inorganic filler, 5-40% carbon black) and adjusting the permittivity of the composite material to be higher than the cable insulation. This parameter optimization enables the material to withstand high electrical stress while maintaining stable dielectric properties across varying operating conditions.
2Reliability
If inorganic fillers are incorporated into elastomeric materials to increase permittivity, then electrical stress control is improved, but dissipation factor increases
Solution Approach 1:
The patent applies local quality by using platelet-shaped inorganic fillers with specific orientation and aspect ratio (2-20:1) rather than randomly distributed spherical particles. This localized structural arrangement optimizes the electric field distribution and permittivity enhancement while minimizing energy dissipation, allowing high electrical stress control with reduced dissipation factor compared to conventional filler distributions.
Solution Approach 2:
The patent optimizes the dissipation factor by carefully selecting the volume percentage of inorganic fillers (5-50%) and carbon black (5-40%), and by controlling the permittivity ratio between the composite material and cable insulation. This parameter optimization ensures that electrical stress control is enhanced while keeping energy losses minimal, resolving the contradiction between improved stress control and reduced energy dissipation.
3Reliability
If multiple insulation layers of differing permittivity are used to reduce electrical stress, then electrical stress is redistributed, but device complexity increases
Solution Approach 1:
The patent extracts the complex multi-layer insulation structure and replaces it with a single-layer elastomeric composite material that has inherently higher permittivity than the cable insulation. This single material layer provides the same electrical stress redistribution function as multiple layers but with simplified structure, manufacturing, and installation, resolving the contradiction between electrical stress reduction and device complexity.
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 material effectively controls electrical stress, maintains low dissipation factor across a broad range of frequencies and voltages, and can be used as both hot and cold shrink materials, offering improved insulation for electrical cables.
Implementation Method 1
Other fillers such as BaTiO3 are incorporated into dielectric materials to increase the relative permittivity for applications involving stress relief in insulation systems
Implementation Method 2
These fillers enhance the thermal conductivity of materials, thereby removing heat from the area of dry band arcing
Implementation Method 3
The layer at the cable insulation can be seen as an additional capacitance, resulting in a redistribution of the electrical potential
Data Source
AI summary
The present disclosure relates to an elastomeric material for providing electrical stress control comprising high structure carbon black and high permittivity inorganic fillers. The elastomeric material of the present disclosure exhibits high permittivity and low dissipation factor.