Condenser Bushing Insulation With Ester Oil and Thermal Paper
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Solution Overview
Problem
Existing high voltage bushings with condenser bodies face challenges in withstanding high temperatures and maintaining insulation integrity over time, leading to reduced safety and life expectancy, and they are not eco-friendly due to the use of mineral oil.
Innovation Solution
The bushing incorporates thermally upgraded paper with synthetic fibers, impregnated with ester oil, which provides higher thermal resistance and biodegradability, allowing for increased temperature tolerance and reduced aging, while being more environmentally friendly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mineral oil is used for impregnation, then good insulation properties are achieved, but environmental friendliness deteriorates
Solution Approach 1:
The patent changes the chemical composition parameter of the impregnating liquid from mineral oil to ester-based liquid, maintaining insulation properties while improving biodegradability and environmental compatibility
Solution Approach 2:
The patent uses a composite structure combining ester-based liquid with thermally upgraded paper containing synthetic fibers, creating a material system that provides both excellent insulation and environmental friendliness
2Ease of manufacture
If conventional paper is used, then manufacturing simplicity is maintained, but thermal resistance deteriorates
Solution Approach 1:
The patent applies thermal upgrading treatment to the paper through chemical modification with nitrogen-containing compounds, increasing the thermal class rating from conventional standards to at least 120°C while maintaining paper-based structure
Solution Approach 2:
The patent creates a composite paper structure combining cellulose base material with heat-resistant synthetic fibers, achieving enhanced thermal resistance while preserving the fundamental paper characteristics and manufacturability
3Reliability
If larger diameter is used, then insulation capacity is improved, but aging rate increases
Solution Approach 1:
The patent changes the thermal stability parameter of the insulation material through thermal upgrading and synthetic fiber addition, enabling the bushing to withstand higher temperatures without accelerated aging, thus extending service life
Solution Approach 2:
The patent employs a composite insulation system with thermally upgraded paper and synthetic fibers that provides both adequate insulation capacity and resistance to thermal aging, allowing optimized bushing dimensions
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 solution enhances the thermal class rating of the bushing, increasing operational safety and life expectancy, reduces the risk of fire hazards, and lowers environmental impact by using biodegradable ester oil, making the bushing suitable for high voltage applications with improved eco-friendliness and safety.
Implementation Method 1
ester oil has a high moisture saturation point and, thus, removes moisture from the paper, which may increase the lifetime of the paper
Implementation Method 2
The paper may be thermally upgraded. A thermally upgraded paper has been chemically modified to reduce the decomposition rate of the paper
Implementation Method 3
The condenser body may provide a uniform potential gradient of the electric field from the conductor to the wall
Data Source
AI summary
A bushing comprises an electrical conductor and a condenser body through which the electrical conductor extends, wherein the condenser body comprises electrically insulating layers and electrically conducting layers, wherein the electrically insulating layers comprise an oil-impregnated paper comprising at least one of a thermally upgraded paper and a paper comprising synthetic fibers.