Vegetable Dielectric Fluid for Transformers
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Solution Overview
Problem
Current dielectric fluids used in electrical transformers, such as mineral oils and synthetic oils, pose environmental risks due to poor biodegradability and high environmental impact, and vegetable oils face challenges with oxidation stability and low pour points, necessitating the development of a biodegradable, oxidation-resistant dielectric fluid with improved properties for use in current transformers.
Innovation Solution
A composition of vegetable oils with a high oleic acid content, combined with specific additives like antioxidants and copper inhibitors, is formulated to enhance oxidation stability, maintain flowability at low temperatures, and ensure compatibility with transformer materials, thereby addressing the limitations of existing dielectric fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mineral oils are used as dielectric fluids, then good dielectric properties and cooling properties are achieved, but environmental biodegradability is poor and ecosystem damage occurs
Solution Approach 1:
The patent changes the chemical composition parameters of the dielectric fluid by using vegetable oils with specific fatty acid profiles (high oleic acid content, controlled linoleic and linolenic acid levels) to achieve both good dielectric properties and environmental biodegradability
Solution Approach 2:
The patent creates a composite dielectric fluid system by combining multiple vegetable oils (sunflower, olive, rapeseed, hazelnut) with specific proportions to achieve optimal balance between dielectric strength, oxidation stability, and biodegradability
2Object-affected harmful factors
If vegetable oils with high polyunsaturated acid content are used, then biodegradability is improved, but oxidation stability deteriorates
Solution Approach 1:
The patent precisely controls the fatty acid composition parameters, limiting polyunsaturated acids (linoleic and linolenic) to specific ranges while maintaining high oleic acid content, thereby achieving both biodegradability and oxidation stability
Solution Approach 2:
The patent introduces antioxidants as intermediary substances that prevent oxidation of the vegetable oil, allowing the use of biodegradable oils without suffering from oxidation instability
3Object-affected harmful factors
If vegetable oils are used as dielectric fluids, then environmental friendliness is improved, but pour point is too high for low temperature operation
Solution Approach 1:
The patent adjusts the fatty acid chain length and saturation parameters by selecting specific vegetable oils and blending ratios to achieve a pour point below -20°C while maintaining environmental biodegradability
Solution Approach 2:
The patent blends different vegetable oils with varying pour points to create a composite mixture with optimized low-temperature flow properties, combining oils with shorter chains to reduce pour point
4Object-affected harmful factors
If vegetable oils are used as dielectric fluids, then biodegradability is improved, but viscosity at operating temperature is not optimal
Solution Approach 1:
The patent optimizes the viscosity parameter by controlling the fatty acid chain length and unsaturation level, achieving a viscosity between 30-50 cSt at 40°C through careful selection of vegetable oil composition
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 vegetable oil composition provides a biodegradable, non-toxic dielectric fluid with high oxidation stability, optimal viscosity, and anti-corrosion properties, suitable for a wide range of operating conditions, reducing environmental risks and production costs while maintaining insulating and cooling performance.
Implementation Method 1
vegetable oils with a high oleic acid content, combined with specific additives like antioxidants and copper inhibitors, is formulated to enhance oxidation stability
Implementation Method 2
act for cooling and insulating the parts in contact thereto
Implementation Method 3
insulating and cooling systems typical of current transformers
Implementation Method 4
maintain flowability at low temperatures, and ensure compatibility with transformer materials
Implementation Method 5
high dielectric strength, biodegradability and oxidation resistance to be used within insulating and cooling systems
Data Source
AI summary
Composition of one or more vegetable oils intended as triglycerides of natural origin with an oleic acid (C18:1) content less than 75%, preferably less than or equal to 74% which composition can be used for preparing dielectric fluids to be used in electrical transformers.