Outdoor Busway Conductor Assembly Against Capillary Contaminant Ingress
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Solution Overview
Problem
Outdoor busway systems face challenges with contaminant ingress, leading to electrical short circuits and insulation breakdown due to capillary action and electrolytic contaminants, which existing sealing methods fail to prevent effectively.
Innovation Solution
A busway system with viscoelastic structural adhesive sheets between conductor bars and a housing assembly design that irreversibly interlocks without through penetrations or fasteners, providing a sealed and mechanically robust enclosure to prevent electrolytic contaminants and maintain electrical integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional sealing systems (gaskets, seals, wraps) are used to protect conductor bars, then the system provides some level of protection under normal conditions, but the sealing systems fail when exposed to environments with contaminant ingress risk
Solution Approach 1:
The patent changes the material parameter from traditional elastomeric gaskets and fiberglass wraps to viscoelastic structural adhesive sheets. This material parameter change provides both sealing and structural functions, maintaining reliability under extreme environmental conditions including contaminant exposure and short circuit forces.
Solution Approach 2:
The patent merges the sealing function and structural support function into a single integrated component - the viscoelastic structural adhesive sheet. This eliminates the need for separate gaskets, wraps, and fastening devices, providing both contaminant protection and mechanical strength while maintaining electrical insulation.
2Strength
If external treatments (multiple seals, fastening devices, wraps) are applied to retain conductor bars, then the system provides mechanical strength and sealing, but the complexity of the system increases and these treatments can fail when exposed to harsh environments
Solution Approach 1:
The patent combines multiple functions (sealing, structural support, conductor retention, electrical insulation) into a single viscoelastic structural adhesive sheet layer, eliminating the need for multiple separate components such as gaskets, wraps, and fastening devices.
Solution Approach 2:
The patent uses viscoelastic structural adhesive sheets as a composite material that provides multiple properties simultaneously: mechanical strength for conductor retention, sealing properties to prevent contaminant ingress, and electrical insulation to maintain safety. This single composite material replaces complex multi-component systems.
3Productivity
If conductor bars are retained in close proximity within an enclosure, then the system achieves compact design and efficient power distribution, but capillary action causes water and electrolytes to travel within the system compromising electrical integrity
Solution Approach 1:
The patent changes the surface and material parameters between conductor bars by introducing viscoelastic structural adhesive sheets. This material parameter change creates a barrier that prevents capillary action, stopping water and electrolyte migration while maintaining the compact conductor arrangement for efficient power distribution.
4Shape
If insulated conductors of opposite polarity are stacked in close contact (sandwich construction), then the system achieves compact design and reduced electromagnetic interference, but the small gaps between bars allow capillary ingress of contaminants
Solution Approach 1:
The patent changes the gap parameter between conductor bars by filling it with viscoelastic structural adhesive sheets. This eliminates the small gaps that enable capillary action while maintaining the compact sandwich construction geometry, preventing contaminant ingress without sacrificing the space-efficient design.
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 system effectively prevents capillary ingress of contaminants, maintains mechanical and electrical integrity, and enhances short circuit and bend strength, reducing the risk of electrical failure and extending the lifespan of busway sections.
Implementation Method 1
Ingress into the bar pack occurs when water travels by capillary action along the small gaps between bars of the bar pack or housing
Implementation Method 2
a conductor set including a plurality of viscoelastic structural sheets stacked alternatively between a plurality of conductor bars
Data Source
AI summary
An outdoor busway system includes one or more conductor sections and one or more electrical connectors such that a conductor section of the outdoor busway system comprises a housing assembly and a conductor set. The housing assembly includes an upper housing section and a lower housing section such that the upper housing section and the lower housing section each having opposing counterposed features to oppose a first separation force of the housing assembly. The conductor set includes a plurality of viscoelastic structural sheets stacked alternatively between a plurality of conductor bars to oppose a second separation force between conductor bars of the plurality of conductor bars.