Surge Arrester Shield Segmentation for Heat Dissipation
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Solution Overview
Problem
Surge arresters face excessive heating during discharge processes, leading to potential damage due to inadequate heat dissipation from the discharge element, which is surrounded by electrically insulating material.
Innovation Solution
Exposing sections of the discharge element not covered by insulating material to allow convection and enhance heat dissipation, using metal-oxide varistors with glazing and supporting elements to radiate heat, and employing shields with a circumferential structure to facilitate heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the discharge element is completely surrounded by electrically insulating material, then the creepage distance is lengthened and withstand voltage is increased, but heat dissipation is impaired leading to excessive heating
Solution Approach 1:
The electrically insulating material is segmented to create shield structures with intentional openings, rather than forming a complete enclosure. This segmentation allows the insulating material to provide electrical insulation and creepage distance while creating pathways for heat dissipation through the shields.
Solution Approach 2:
The shield structure implements local quality by having different regions with different properties: closed regions provide electrical insulation and creepage distance, while open regions provide heat dissipation pathways. This localized differentiation resolves the contradiction between insulation and heat dissipation.
2Reliability
If the discharge element is completely covered by insulating material, then electrical insulation is improved, but thermal energy emission is reduced
Solution Approach 1:
The insulating material is segmented into shield structures with openings, creating a hybrid structure that provides both electrical insulation and thermal emission pathways. The segmentation allows simultaneous achievement of electrical insulation and heat dissipation.
Solution Approach 2:
The shield structure acts as an intermediary between the discharge element and the external environment, selectively allowing thermal energy to pass through while maintaining electrical insulation. The shield mediates between the conflicting requirements of insulation and heat dissipation.
3Power
If high current is passed through the discharge element during discharge process, then surge protection function is achieved, but excessive heat is generated within short time
Solution Approach 1:
The shield structure converts the harmful effect of heat generation into a beneficial dissipation mechanism. The openings in the shields provide pathways for the heat generated during surge discharge to escape, transforming the harmful thermal energy into a controlled dissipation process.
Solution Approach 2:
The shield structure changes the thermal parameters of the system by providing controlled pathways for heat transfer. This allows the system to maintain high power surge protection capability while managing the thermal parameters through structured heat dissipation paths.
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
Effectively prevents excessive heating of the discharge element by allowing efficient heat dissipation through convection and radiation, thereby protecting the surge arrester from damage.
Implementation Method 1
it is advantageous for the discharge element to make direct or indirect contact with a gas which allows convection
Implementation Method 2
Sintered materials such as these are able to quickly dissipate outwards the heat created in the interior as a result of a current flow, and to radiate it away there
Data Source
AI summary
A surge arrester has a diverter element with a shielding element that increases the creepage path. The shielding element includes at least one shield. The shielding element is configured from an electrically insulating material and the diverter element forms a discharge current path. One section of the diverter element lying adjacent to the shield is not covered by the electrically insulating material. The diverter element is provided with a support element, which mechanically stabilizes a shield.