Ester Dielectric Fluid Composition for Transformers
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Solution Overview
Problem
Existing dielectric fluids, particularly synthetic esters, lack improved properties such as pour point, flash point, and fire point, which are crucial for effective use in electrical apparatus like transformers.
Innovation Solution
A dielectric fluid composition comprising esters of pentaerythritol and C4 to C12 carboxylic acids, where at least 50% of the acids are heptanoic acid, with a specific ratio of branched and linear chain acids, eliminating the need for pour point depressants and enhancing viscosity, pour point, and fire point properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synthetic esters are used as dielectric fluids, then dielectric properties are improved, but pour point, flash point and fire point properties remain insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the ester by specifying precise molecular structures: using pentaerythritol as the alcohol component and controlling the carboxylic acid composition (at least 50% heptanoic acid, specific chain lengths C4-C12, controlled branching). This parameter optimization simultaneously achieves good dielectric properties and improved temperature characteristics including pour point, flash point and fire point.
Solution Approach 2:
The patent creates a composite ester structure by combining pentaerythritol with multiple carboxylic acid components in specific ratios. The mixed ester composition (containing both linear and branched chain acids) provides synergistic effects that improve both dielectric performance and thermal properties, resolving the contradiction between dielectric reliability and temperature resistance.
2Temperature
If pour point depressants are added to improve low temperature flow, then pour point is reduced, but composition complexity and additive requirements increase
Solution Approach 1:
The ester composition is designed to be self-sufficient by incorporating the pour point depression function directly into the base ester structure. The specific molecular structure (pentaerythritol with C4-C12 carboxylic acids including at least 50% heptanoic acid) inherently provides low temperature flow properties without requiring external pour point depressant additives, thus simplifying the overall composition.
Solution Approach 2:
The patent extracts the pour point depression function from separate additive components and integrates it directly into the base ester molecular structure. By designing the ester with specific chain lengths and branching characteristics, the low temperature performance is built-in, eliminating the need for additional pour point depressant chemicals and reducing composition complexity.
3Ease of operation
If viscosity is reduced to improve fluidity, then dynamic viscosity decreases, but film formation and protective properties may be compromised
Solution Approach 1:
The patent optimizes the viscosity parameter by controlling the molecular structure of the ester. The specific combination of pentaerythritol with C4-C12 carboxylic acids (at least 50% heptanoic acid) produces an ester with dynamic viscosity less than 30 cP at 40°C, ensuring good fluidity while the molecular structure maintains adequate film formation and protective properties for dielectric application.
Data Source
AI summary
The present invention relates to dielectric fluids and esters, particularly to ester compositions suitable for use in dielectric fluid compositions as well as to dielectric fluid compositions, methods of manufacturing ester compositions and dielectric fluid compositions, and to electrical apparatus containing the dielectric fluids.