Thermally-Stable Dielectric Fluid Using Composite Antioxidants

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Solution Overview

Problem

Current dielectric fluids used in transformers and electrical components face challenges such as toxicity, environmental impact, and limited thermal stability, which affect their service life and safety, particularly due to high temperatures and viscosity issues.

Innovation Solution

A thermally-stable dielectric fluid composition comprising an oil, a substituted hindered phenolic antioxidant, and a substituted diphenyl amine antioxidant, which provides improved antioxidant properties and thermal management, suitable for use in transformers and electrical components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If vegetable oils are used as dielectric fluid, then environmental friendliness and dielectric characteristics are improved, but pour point increases and temperature operating window is limited

Engineering Contradiction:

Improveenvironmental friendlinessVSAvoidtemperature operating window

Core Design Contradiction:

Object-affected harmful factorsVSTemperature

Solution Approach 1:

The patent combines multiple vegetable oils (soybean oil, sunflower oil, canola oil) in specific proportions to create a composite dielectric fluid that maintains environmental friendliness while improving thermal stability and expanding the operating temperature range through synergistic effects of different oil components

Inventive Principle:

Principle #40Composite materials

2Object-affected harmful factors

If vegetable oils are used as dielectric fluid, then flash and fire resistance are improved, but viscosity increases and thermal stability decreases

Engineering Contradiction:

Improvefire resistanceVSAvoidthermal stability

Core Design Contradiction:

Object-affected harmful factorsVSStability of the object's composition

Solution Approach 1:

The patent modifies the chemical composition parameters of vegetable oils by selecting specific fatty acid profiles and combining multiple oil sources to achieve optimal balance between fire resistance and thermal stability, creating a dielectric fluid that maintains performance across extended temperature ranges

Inventive Principle:

Principle #35Parameter changes

3Stability of the object's composition

If mineral oil is used as dielectric fluid, then viscosity and thermal stability are improved, but fire point decreases

Engineering Contradiction:

Improvethermal stabilityVSAvoidfire point

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The patent fundamentally changes the chemical composition from mineral-based to vegetable-based oils, altering the molecular structure to eliminate aromatic hydrocarbons and replace them with saturated and monounsaturated fatty acid chains that provide both thermal stability and high fire points

Inventive Principle:

Principle #35Parameter changes

4Reliability

If PCBs are used as dielectric fluid, then electrical insulative properties and thermal stability are improved, but toxicity and environmental impact increase

Engineering Contradiction:

Improveelectrical insulative propertiesVSAvoidtoxicity

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent completely transforms the chemical composition from PCB-based aromatic hydrocarbons to vegetable-based triglycerides and fatty acid esters, maintaining electrical insulative properties through appropriate dielectric constant and viscosity characteristics while eliminating toxic chlorine-containing compounds

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite dielectric fluid from multiple vegetable oil sources to replicate the performance characteristics of PCBs while maintaining environmental safety, using blends of soybean, sunflower, and canola oils to achieve optimal electrical and thermal properties

Inventive Principle:

Principle #40Composite materials

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 dielectric fluid achieves enhanced thermal stability, extended service life, and improved safety by maintaining dielectric strength and insulating properties over a wide temperature range, reducing the risk of overheating and environmental harm.

Implementation Method 1

the dielectric fluid also provides electrical insulative properties to the internal transformer components... Heat degrades insulation. High temperatures can shorten the life of insulation

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

Transformers are filled with dielectric fluids to dissipate the relatively large quantities of heat generated

Methodology Applied

Scientific EffectConvection: Convection

Implementation Method 3

A dielectric fluid is provided and includes (a) an oil, (b) a substituted, hindered phenolic antioxidant, and (c) a substituted, diphenyl amine antioxidant

Methodology Applied

Scientific EffectOxidation inhibition: Oxidation

Data Source

PatentEP2616508B1A thermally-stable dielectric fluid

Publication Date: 2014.12.17 DOW GLOBAL TECHNOLOGIES LLC

AI summary

The disclosure is directed to a thermally-stable dielectric fluid. The dielectric fluid includes (a) an oil, (b) a substituted, hindered phenolic antioxidant having at least two substituted cresol groups being covalently bonded to each other through a methylene bridge, and (c) a substituted, diphenyl amine antioxidant having at least two substituted phenyl groups being covalently bonded to each other through an amine bridge.