Dielectric Fluid Composition Using Phosphites to Suppress Stray Gases
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Solution Overview
Problem
Dielectric fluids used in electrical equipment face issues of thermal and oxidative degradation, leading to the generation of stray gases such as hydrogen, methane, and ethane, which can cause explosions and fire propagation, and existing antioxidants like di-tertbutylphenol-based compounds introduce coloration that interferes with quality visualization.
Innovation Solution
Incorporation of phosphite compounds into dielectric fluids, particularly those derived from bio-sourced oils, synthetic esters, or mineral oils, to stabilize the fluids by preventing the formation of stray gases, combined with non-phosphite antioxidants to enhance oxidative stability and reduce coloration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If di-tertbutylphenol-based antioxidants are added to dielectric fluids to prevent oxidative degradation, then oxidative stability is improved, but coloration increases which interferes with quality visualization
Solution Approach 1:
The patent changes the chemical parameter of the antioxidant from di-tertbutylphenol-based compounds to phosphite compounds. This parameter change resolves the contradiction because phosphite compounds provide oxidative stability without introducing the severe coloration problems associated with di-tertbutylphenol-based antioxidants, thus maintaining both reliability and visualization quality.
2Reliability
If dielectric fluids are used in electrical equipment to transport heat and provide insulation, then electrical performance is improved, but thermal and oxidative degradation occurs leading to stray gas generation
Solution Approach 1:
The patent applies preliminary action by adding phosphite compounds to the dielectric fluid before thermal and oxidative degradation can occur. These compounds act as preventive stabilizers that suppress degradation reactions and stray gas generation during the service life of the equipment, thus maintaining electrical performance while preventing harmful gas accumulation.
Solution Approach 2:
The phosphite compounds serve as intermediary substances that mediate between the dielectric fluid and the degradation processes. They interfere with the thermal and oxidative degradation mechanisms, preventing the formation of harmful stray gases while allowing the dielectric fluid to continue performing its insulation and cooling functions.
3Stability of the object's composition
If existing antioxidants are used to stabilize dielectric fluids, then oxidative degradation is reduced, but coloration increases making it difficult to assess fluid quality
Solution Approach 1:
The patent changes the antioxidant parameter from conventional di-tertbutylphenol-based compounds to phosphite compounds. This change resolves the detection difficulty because phosphite compounds do not produce the intense coloration of conventional antioxidants, allowing visual assessment of fluid quality to remain effective while maintaining oxidative stability.
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 addition of phosphite compounds significantly reduces stray gassing by up to 80% and enhances oxidative stability, maintaining fluid quality and safety in electrical equipment.
Implementation Method 1
oxidative degradation is to add a di-tertbutylphenol-based antioxidant. These antioxidants act by extracting a hydrogen radical from the peroxide formed during oxidation
Implementation Method 2
Thermal degradation is evidenced by generation of stray gases selected from hydrogen, methane, ethane, and ethylene
Implementation Method 3
non-phosphite antioxidants to enhance oxidative stability and reduce coloration
Data Source
AI summary
A dielectric fluid is provided comprising an oil and one or more compounds selected from the group consisting of phosphite compounds. It has been discovered that addition of one or more compounds selected from the group consisting of phosphite compounds to dielectric fluids comprising oil impart a stabilizing effect that reduces, inhibits or prevents formation of stray gases in the dielectric fluid during ordinary use.