Conductive Shutter Assembly for Compact Switchgear Insulation
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Solution Overview
Problem
Current electric switchgears face challenges in maintaining effective dielectric insulation and preventing electric discharges or arcs, especially when compacted for smaller installations, leading to potential damage and safety hazards.
Innovation Solution
The design incorporates a shutter assembly with conductive shutter panels and elongated connection elements, partially covered with insulating material, which are mechanically linked to maintain relative position and move between protective and non-protective positions, reducing electric field strength and enhancing dielectric insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the switchgear is compacted to reduce size, then installation space is reduced, but dielectric insulation performance deteriorates leading to electric discharges
Solution Approach 1:
The patent introduces an intermediary insulating barrier structure between live parts and other components. This barrier acts as a mediator that maintains dielectric insulation even when the overall switchgear volume is reduced, preventing electric discharges while enabling compact design.
Solution Approach 2:
The patent employs composite insulating structures combining different materials (such as insulating paint coatings on metallic surfaces, or multi-layer insulating barriers) to achieve high dielectric strength in reduced spaces. The composite approach allows maintaining insulation performance while minimizing the volume required for clearance distances.
2Length of stationary object
If internal dielectric distances are reduced for compact design, then switchgear size decreases, but electric discharges and arcs occur more frequently
Solution Approach 1:
The patent changes the parameters of the insulating barrier (such as thickness, material composition, surface treatment) to compensate for reduced dielectric distances. By adjusting these parameters, the system maintains adequate insulation strength even when physical clearance distances are minimized for compact design.
Solution Approach 2:
The patent applies curvature or rounded edges to conductive surfaces near insulating barriers, which helps distribute electric field stress more evenly and prevents field concentration that could lead to discharges. This geometric modification allows safer operation at reduced dielectric distances.
3Reliability
If electrically insulating paints are applied to components, then dielectric insulation improves, but manufacturing complexity and cost increase due to difficult coating processes
Solution Approach 1:
The patent applies insulating coatings or barriers only in specific localized areas where dielectric protection is most critical, rather than coating entire components. This selective approach maintains necessary insulation while significantly reducing manufacturing complexity and cost compared to full-surface coating requirements.
Solution Approach 2:
The patent incorporates insulating features directly into the component design and manufacturing process (such as molded-in insulating barriers or integrated insulating structures) rather than requiring separate post-manufacturing coating steps. This preliminary integration simplifies the overall manufacturing process while ensuring consistent insulation quality.
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 configuration effectively prevents electric discharges, allows for compact switchgear design without compromising insulation, and simplifies manufacturing, ensuring safer operations and cost competitiveness.
Implementation Method 1
The intermediate portion of each connection element is at least partially covered by a layer of electrically insulating material
Data Source
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AI summary
An electric switchgear (1) for low-voltage or medium-voltage applications comprising a cabinet (2), a withdrawable switching apparatus (4) and a shutter assembly (5) movable along a reference plane (P) of motion. The shutter assembly comprises a first shutter panel (51) and a second shutter panel (52) at least partially made of conductive material and spaced one from another. The shutter assembly comprises one or more elongated connection elements (53) mechanically connecting said first and second shutter panels with a rigid link, so that said first and second shutter panels move together along said reference plane of motion maintaining their relative position. Each connection element is at least partially made of electrically conductive material and has an elongated blunt shape with rounded edges.