Sliding Insulating Sheets for Power Conductor Isolation
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Solution Overview
Problem
Electrical systems, such as Motor Control Centers, face challenges in providing adequate electrical short-circuit protection within dimensional constraints, as existing solutions require redesigning components or do not effectively isolate power conductors from each other, leading to risks of 'arc flash' and other hazards.
Innovation Solution
The use of electrically insulating sheets with a dielectric strength of 0.0254 mm (mil) to isolate power conductors by fitting within preconfigured components, secured by collars and fasteners, forming a tubular structure around power conductors to prevent electrical contact and reduce hazards like arc flash.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power conductors are isolated using traditional insulation methods, then electrical short-circuit protection is improved, but the dimensional constraints of MCC components are violated requiring redesign
Solution Approach 1:
The insulation system is segmented into multiple functional layers: a first insulating layer directly covering the power conductor, and a second insulating layer covering the first layer. This segmentation allows each layer to be optimized for specific functions (conductor coverage vs. phase isolation) while maintaining compatibility with existing MCC component dimensions, eliminating the need for redesign.
Solution Approach 2:
The insulation structure uses a nested configuration where the second insulating layer is disposed over the first insulating layer, creating a concentric arrangement. This nesting approach maximizes insulation effectiveness within the limited radial space available in MCC components, providing adequate electrical isolation without increasing the overall dimensional envelope that would require component redesign.
2Object-affected harmful factors
If adequate insulation distance is provided between power conductors, then electrical safety is improved, but the access and dimension constraints of MCC are violated
Solution Approach 1:
The patent employs flexible insulating layers (thin films) that can conform to the geometry of power conductors and provide adequate electrical isolation in a compact form factor. These thin film insulators enable sufficient creepage and clearance distances to prevent arc flash hazards while maintaining the compact dimensional constraints required for MCC access and installation.
Solution Approach 2:
Instead of increasing the linear distance between conductors in the horizontal plane, the solution transitions to the vertical dimension by stacking insulating layers radially around the conductors. This dimensional transition provides the necessary insulation distance in a direction that does not interfere with MCC access requirements or overall component dimensions.
3Reliability
If insulating sheets are used to cover power conductors, then electrical isolation is improved, but the complexity of installation and securing increases
Solution Approach 1:
The insulating layers are designed to be pre-formed and pre-configured to fit standard power conductor geometries and MCC component arrangements. This preliminary preparation of the insulation components allows for straightforward installation without complex field customization or adjustment, reducing installation complexity while maintaining reliable electrical isolation.
Solution Approach 2:
The insulating layers are designed with flexible properties that allow them to be dynamically adjusted and conform to the specific geometry of the power conductors during installation. This flexibility simplifies the installation process by eliminating the need for precise pre-positioning or complex securing mechanisms, while still providing reliable electrical isolation once installed.
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 solution effectively isolates power conductors, reducing the risk of electrical hazards and arc flash incidents within the constraints of existing electrical system components without the need for redesign, enhancing safety and compliance with protection standards.
Implementation Method 1
The sheet has a dielectric strength per 0.0254 mm (mil) effective to isolate power conductors based on maximum charge and proximity of the power conductors
Data Source
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AI summary
A system for isolating a power conductor includes a power conductor that extends between first and second flanking support structures. First and second collars (C1,C2) are connected respectively to the first and second flanking support structures. The first and second collars each at least partially surround the power conductor and including respective first and second open tracks (T) that cooperate with each other to define a sheet-receiving slot. An electrically insulating/insulative sheet (S) is located in the sheet-receiving slot and extends continuously between the first and second collars. The sheet is secured in covering relation with the power conductor.