Shielded Rigid Bus Duct Layout for High-Current Thermal Control
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Solution Overview
Problem
Existing bus ducts are expensive and time-consuming to install and replace, and they often require re-torquing of bolts every six months due to seismic considerations, leading to increased maintenance costs and complexity.
Innovation Solution
A rigid bus duct system comprising a pair of side rails, transverse support members, and insulated conductors arranged in high current phase groups and a neutral group, with shielding structures between conductors to optimize performance and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional rigid bus ducts with blade-type connections and bolts are used, then electrical power can be distributed through multiple floors, but the installation is expensive and time-consuming, and the joints present high resistance requiring re-torquing every six months
Solution Approach 1:
The bus duct system is divided into modular sections that can be independently assembled and connected. Each section contains pre-organized conductors and support structures, allowing for faster installation without compromising connection reliability. The segmentation enables standardized connection points that reduce installation complexity and time.
Solution Approach 2:
The patent replaces traditional blade-type mechanical connections with bolted joints with a simplified connector system that eliminates the need for re-torquing. The new connection mechanism uses self-locking or permanent securement features that maintain electrical contact without requiring periodic mechanical adjustment, thereby reducing maintenance time while preserving reliability.
2Reliability
If rigid bus ducts are installed with longer lateral sides oriented perpendicularly to structural walls for seismic considerations, then safety is improved, but the area footprint required is significantly larger than the cross-sectional area of the bus duct itself
Solution Approach 1:
The patent transitions from a traditional horizontal bus duct configuration to a vertical orientation that utilizes the building's height dimension rather than floor plane area. By routing bus ducts vertically through shafts or chases between floors, the system maintains seismic safety through proper structural anchoring while minimizing the footprint on each individual floor, effectively moving the problem from two-dimensional to three-dimensional space utilization.
Solution Approach 2:
The bus duct system is nested within existing building infrastructure such as vertical shafts, elevator wells, or dedicated utility chases. This nesting approach allows the bus duct to occupy space that would otherwise be unused or underutilized, maintaining seismic performance through integrated structural connections while minimizing additional footprint requirements on occupied floors.
3Power
If more conductors are grouped together in traditional bus ducts, then power distribution capacity is increased, but thermal efficiency decreases and electromagnetic interference increases
Solution Approach 1:
The patent implements differential spacing and grouping strategies for different phases and conductor types within the bus duct assembly. Conductors are arranged with optimized spacing to balance current carrying capacity with thermal dissipation, and shielding structures are selectively positioned between specific phase groups to minimize electromagnetic interference only where needed, rather than uniformly throughout the entire assembly.
Solution Approach 2:
Shielding structures and thermal barriers are introduced as intermediary elements between adjacent conductor groups. These intermediaries serve dual functions: they provide electromagnetic shielding to reduce interference between phases while simultaneously managing thermal fields to maintain efficient heat dissipation, thereby enabling higher power capacity without sacrificing thermal or electromagnetic performance.
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 provides improved thermal efficiency, reduced electromagnetic interference, and longer length capabilities compared to traditional bus ducts, while also simplifying installation and reducing maintenance requirements.
Implementation Method 1
a plurality of shielding structures connected between the support members and positioned with at least a portion of one of the shielding structures located between insulated conductors of the same high current phase group
Data Source
AI summary
A rigid bus duct comprising a pair of side rails extending in a longitudinal direction, a plurality of support members extending between the side rails in a transverse direction, and a plurality of insulated conductors extending longitudinally, and held in a fixed relationship to one another by the plurality of support members. The plurality of insulated conductors are arranged in groups including a plurality of high current phase groups and a neutral group, and a plurality of shielding structures connected between the support members and positioned with at least one shielding structure located between the insulated conductors of each high current phase group.