Dielectric Fluid Additive Reduces LI Streamer Speed
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Solution Overview
Problem
Ester-based dielectric fluids used in electrical applications have high LI streamer speeds, which pose safety and performance concerns, particularly in high-voltage transformers, due to their lower breakdown voltage and higher streamer acceleration compared to mineral oils.
Innovation Solution
A dielectric fluid composition is developed by adding an additive with a lower first excitation energy than the fluid itself, which reduces LI streamer speeds and increases breakdown voltage, making it comparable to mineral oil performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If ester-based dielectric fluids are used to replace mineral oil, then environmental safety and fire resistance are improved, but LI streamer speed increases and breakdown voltage decreases
Solution Approach 1:
The patent introduces an additive as an intermediary substance that mediates between the ester-based fluid and the electrical stress. The additive has lower ionization potential than the ester fluid, so it preferentially ionizes and forms plasma that absorbs energy and reduces streamer propagation, thereby protecting the ester fluid from direct electrical breakdown while maintaining its environmental and fire safety advantages
Solution Approach 2:
The patent changes the chemical composition parameters of the dielectric fluid by adding substances with specific properties (lower ionization potential). This parameter change transforms the electrical characteristics of the fluid mixture, reducing streamer speed and increasing breakdown voltage while preserving the base ester fluid's environmental and fire safety properties
2Object-affected harmful factors
If vegetable oils are used as dielectric fluid, then biodegradability and fire safety are improved, but viscosity increases affecting cooling efficiency
Solution Approach 1:
The patent creates a composite dielectric fluid by combining ester-based base fluid with additives. This composite material achieves a balance between the high viscosity of pure vegetable oils and the desired cooling efficiency, while maintaining the biodegradability and fire safety benefits of the ester base
3Adaptability or versatility
If natural ester-based fluids are used, then renewability is improved, but pour point temperature increases reducing operational range
Solution Approach 1:
The patent modifies the physical parameters of the ester-based fluid by adding additives that act as pour point depressants. This parameter change lowers the freezing point of the fluid, expanding its operational temperature range while preserving the renewability advantage of using natural ester bases
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 additive significantly reduces LI streamer speeds by at least 50% and increases acceleration voltage by at least 25%, enhancing the safety and performance of ester-based dielectric fluids in electrical applications.
Implementation Method 1
adding an additive with a lower first excitation energy than the fluid itself, which reduces LI streamer speeds and increases breakdown voltage
Data Source
AI summary
The present invention relates to a liquid composition for electrical insulation including a dielectric fluid and an additive, the additive being dissolved in the dielectric fluid and having a 1st excitation energy which is lower than the 1st excitation energy of the dielectric fluid.