Wound Electrical Component With High-Permittivity Edge Field Grading
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Solution Overview
Problem
Conventional methods for high-voltage electrical components using conductive foils result in enhanced electric fields at edges, leading to defects and increased field strength, which are not effectively addressed by existing field-grading materials.
Innovation Solution
The use of printed high permittivity materials extending beyond the edges of conductive layers in high-voltage electrical components to encompass defects and modify the electric field, reducing edge-related issues and field strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If printed electrically conducting layers are used instead of foils, then the conducting layers can be made thinner and defects can be avoided, but the electrical field at the edges is increased further
Solution Approach 1:
A high permittivity material layer is introduced as an intermediary between the printed conducting layer and the insulation web. This mediator layer extends beyond the conducting layer edges and encompasses the high field regions, thereby reducing the electrical field strength at the edges while maintaining the precision benefits of printed conducting layers.
Solution Approach 2:
The invention combines multiple materials with different properties: a printed conducting layer (for precision and thinness), a high permittivity material (for field management), and an insulation web (for electrical insulation). This composite structure allows each material to address specific aspects of the technical contradiction.
2Device complexity
If conventional aluminium foils are used as conductive layers, then the structure is simple, but the electric field gets enhanced at the edges leading to inhomogeneous field distribution
Solution Approach 1:
The high permittivity material is applied locally at the edges of the conducting layers where the field enhancement occurs. This localized approach addresses the field distribution uniformity issue without requiring complex modifications to the entire structure, maintaining relative simplicity while achieving homogeneous field distribution.
3Stress or pressure
If field-grading material tapes are used at the edges of foils, then the electrical field is modified, but high losses result
Solution Approach 1:
Instead of using field-grading material tapes that rely on resistive properties (causing high losses), the invention changes the approach by using a high permittivity material. This parameter change from resistive field grading to capacitive field grading reduces energy losses while still achieving effective electrical field modification at the edges.
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 approach effectively reduces defects and edge field enhancements, providing improved performance and precision in high-voltage applications by integrating high permittivity materials with conductive layers, enhancing the structural integrity and field management of electrical components.
Implementation Method 1
printing a high permittivity material to form a high permittivity layer
Data Source
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Figure 5a~6
AI summary
The present disclosure relates to a wound electrical component comprising a wound body comprising a plurality of wound layers of a web (30) of an electrically insulating material around a longitudinal axis of the body. The wound body comprises a plurality of electrically conducting layers (24) of an electrically conducting material, each printed onto a respective separate area of the web in the wound body. An edge zone (33) of at least one of the plurality of electrically conducting layers is connected to a printed high permittivity layer (50) of a high permittivity material along said edge zone such that at least a part (52) of the high permittivity layer extends, printed on the web, beyond the edge zone.