Busway Interface Apparatus for Hot-Swapping Plug-in Units
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Solution Overview
Problem
Existing busway electrical distribution systems require power-down for adding, removing, or replacing plug-in units, which is inconvenient in data centers where uptime is critical, and existing solutions either rely on warnings to prevent 'hot swapping' or lack redundancy when using dual feeds.
Innovation Solution
An interface apparatus that mechanically and electrically secures plug-in units to busways, allowing for installation, removal, and replacement without powering down, using a lever-actuated mechanism to move jaws between uncoupled and coupled positions, ensuring secure and safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If plug-in units are connected or disconnected from busway while powered on, then data center uptime is maintained, but safety hazards such as arc blasts and electrical shock increase
Solution Approach 1:
The disconnect jaw is retracted into the housing before the plug-in unit is connected to the busway, and remains retracted during the connection process. This preliminary positioning prevents accidental contact with live conductors and eliminates arc blast hazards while allowing the busway to remain powered on during maintenance operations.
Solution Approach 2:
The interface apparatus serves as an intermediary device between the busway and the plug-in unit. It provides a controlled environment with retractable electrical contacts that mediate the connection process, allowing safe hot-swapping operations while isolating the user from direct exposure to live conductors.
2Ease of manufacture
If traditional plug-in outlets with exposed conductive material are used, then installation is simple, but safety warnings must be posted and hot swapping still occurs despite warnings
Solution Approach 1:
The electrical coupling assembly features dynamic, retractable jaws that can extend and retract based on operational needs. During installation, the jaws are retracted to expose the plug-in interface for easy connection. During operation, the jaws can be extended to establish secure electrical contact, providing both ease of installation and inherent safety through controlled exposure of conductive elements.
Solution Approach 2:
The hazardous exposed conductive material is extracted from the static outlet structure and replaced with controlled, retractable electrical coupling jaws. This removes the continuous safety hazard of exposed conductors while maintaining the simplicity of plug-in connections through the housing interface.
3Strength
If mechanical coupling assembly with hooks is used to secure housing to busway, then secure mechanical attachment is achieved, but the coupling mechanism adds complexity to the overall system
Solution Approach 1:
The coupling mechanism is segmented into distinct functional components: hooks for mechanical attachment to the busway, and a retractable electrical coupling assembly for electrical connection. This segmentation allows each component to be optimized independently - the hooks provide simple, strong mechanical attachment while the electrical coupling provides controlled electrical contact - reducing overall system complexity through functional separation.
Data Source
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AI summary
An interface apparatus (20) is configured to be mechanically secured and electrically coupled to a busway (10). The interface apparatus includes a housing (26) configured to mate with the busway and a plug-in interface (40) coupled to the housing. The plug-in interface is configured to receive a plug-in unit (22). The interface apparatus further includes an electrical coupling assembly (46) coupled to the housing and configured to move between an uncoupled position in which the plug-in interface is uncoupled to the busway and a coupled position in which the plug-in interface is electrically coupled to the busway. The interface apparatus further includes an actuator assembly (48) coupled to the housing and the electrical coupling assembly. The actuator assembly is configured to move the electrical coupling assembly between the uncoupled and coupled positions and to secure the plug-in unit to the housing.