Transformer Insulation Structure for Electrical Field Stress Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Transformers face high electrical field stress issues due to voltage differences between components, leading to potential discharges, arcs, and increased failure rates.
Innovation Solution
The implementation of electrical field stress control regions with high dielectric constant materials or composite materials around the edges of high-voltage windings and semiconducting layers to mitigate electrical field strength and prevent surface arcs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high-voltage windings are used for voltage conversion, then voltage transformation capability is improved, but electrical field stress increases leading to discharges and arcs
Solution Approach 1:
A stress control region comprising stress control material is introduced as an intermediary between the high-voltage winding and surrounding components. This intermediate layer mitigates the electrical field stress generated by the high-voltage winding, preventing direct interaction between the high electric field and adjacent components, thereby reducing discharges and surface arcs while preserving voltage transformation capability
Solution Approach 2:
The electrical field distribution is modified by changing the physical and electrical parameters of the stress control material, including its dielectric constant, thickness, and conductivity. By optimizing these parameters, the patent controls the electrical field stress levels in the region surrounding the high-voltage winding, reducing harmful effects without compromising the transformer's voltage conversion function
2Object-affected harmful factors
If stress control regions are added around high-voltage windings, then electrical field stress is reduced, but device complexity increases
Solution Approach 1:
Rather than uniformly modifying the entire transformer structure, the stress control region is applied locally only around the high-voltage winding where electrical field stress is most problematic. This localized approach reduces electrical field stress at critical points while minimizing the overall structural complexity and material usage compared to a comprehensive redesign
Solution Approach 2:
The stress control material may be implemented as a composite structure combining different materials with complementary properties, such as dielectric materials with specific conductivity characteristics. This allows the stress control region to effectively manage electrical field stress while maintaining a relatively simple and integrated design that does not significantly increase device complexity
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
This solution effectively reduces electrical field stress, minimizing the risk of surface arcs and enhancing the reliability and longevity of transformers by limiting electrical field strength below critical thresholds.
Implementation Method 1
The stress control region may be a region of stress control materials, such as a stress control material with a high dielectric constant
Implementation Method 2
The electrical field stress control region may surround the components of the transformer that are at a different voltage than the surrounding structures
Data Source
AI summary
Systems, apparatuses, and methods are described for a transformer supporting two or more sets of windings electrically connected to different voltage levels. Use of stress control materials or composite materials (comprising a matrix and filler) may direct electrical fields caused by the different voltage levels to have a lowered electrical field amplitude.