Dry Transformer Coating for Thermal Stability
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Solution Overview
Problem
Existing dry transformers face challenges in achieving a coating with optimal thermal, mechanical, and chemical stability, as well as defined sheet resistance, which is crucial for high-voltage applications and compact designs.
Innovation Solution
A coating for the insulation body of dry transformers is developed using a formulation comprising a resin component and microscale electrically conductive fillers, with a particle size range of 1 μm to 2 mm, and a sheet resistance of 102 to 105 ohms/square, applied via spraying or other methods, ensuring high mechanical robustness and resistance to environmental factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coating is applied to the insulation body surface, then thermal stability and mechanical robustness are improved, but manufacturing complexity increases
Solution Approach 1:
The coating is formulated as a composite material combining resin base material with conductive filler particles (carbon black, graphite, or metal powder). This composite structure provides both thermal stability and mechanical robustness while maintaining electrical conductivity, resolving the contradiction between reliability improvement and manufacturing complexity by integrating multiple functions into a single material system.
Solution Approach 2:
The patent specifies precise parameter ranges for the coating formulation, including filler content (10-50 wt%), particle size (1 μm to 2 mm), and sheet resistance (102-105 ohms/square). By controlling these parameters, the coating achieves optimal thermal and mechanical properties while maintaining manufacturability through standardized formulation specifications.
2Reliability
If microscale conductive filler is used in the coating, then electrical conductivity and sheet resistance control are improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent defines a specific particle size range (1 μm to 2 mm) for the microscale conductive filler, which balances electrical conductivity performance with manufacturing feasibility. This parameter specification ensures adequate conductivity while avoiding excessively tight tolerances that would increase manufacturing precision requirements.
Solution Approach 2:
The coating formulation allows for local variation in filler distribution and concentration, with the sheet resistance being controlled through the overall filler content (10-50 wt%) rather than requiring uniform particle distribution. This approach maintains electrical performance while reducing manufacturing precision demands.
3Reliability
If the coating completely covers the insulation body surface, then electrical field shielding is improved, but material consumption increases
Solution Approach 1:
The patent specifies that the coating should completely cover the insulation body surface to ensure adequate electrical field shielding for high-voltage applications. This complete coverage approach prioritizes shielding effectiveness over material conservation, which is acceptable given the relatively modest material consumption due to the thin coating layer and optimized filler content.
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 coating provides stable thermal performance, mechanical robustness, and resistance to moisture and insolation, enabling a more compact transformer design with reduced power loss and improved electrical field shielding.
Implementation Method 1
a coating having a particular sheet resistance, which comprises a resin component and at least one microscale and electrically conductive filler
Implementation Method 2
exhibiting high thermal stability, high mechanical robustness and resistance to environmental effects
Data Source
AI summary
The present disclosure relates to transformers. Various embodiments of the teachings herein may include a coating of an insulation body of a dry transformer. For example, the electrical winding may include multiple windings of a winding conductor wound to form a coil. The coil has been embedded into a solid insulation body. In some embodiments, a coating of an electrically conductive material, comprising a resin matrix and microscale filler, has been applied to at least one surface of the insulation body.