Modular Static Bypass Backfeed Isolation With Motorized Contacts
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Solution Overview
Problem
Uninterruptible power supply (UPS) systems face challenges in preventing backfeed voltage, which can occur when modules are inserted or removed in powered systems, posing risks to operators and requiring manual de-energization for safety, but existing backfeed protection methods are not fully automated or efficient.
Innovation Solution
A backfeed protection system with a moving plate assembly and linear motor that automates the engagement and disengagement of electrical contacts with busbars, using modular locking switches to secure the casing to the frame, ensuring safe operation by preventing removal when the system is not fully disengaged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual de-energization is required for module insertion/removal, then operator safety is improved, but system productivity and ease of operation deteriorate due to manual intervention requirements
Solution Approach 1:
The system performs preliminary de-energization of electrical contacts through the actuator mechanism before module insertion or removal is attempted. The moving plate assembly is automatically positioned to disconnect electrical contacts prior to module handling, eliminating the need for manual de-energization while maintaining safety
Solution Approach 2:
The system uses its own actuator mechanism to automatically perform the de-energization function that would otherwise require external manual intervention. The actuator moves the moving plate assembly to disconnect electrical contacts autonomously, making the system self-sufficient for safety-critical operations
2Ease of operation
If automated actuator mechanism is implemented for electrical contact engagement, then ease of operation is improved, but device complexity increases due to additional mechanical components
Solution Approach 1:
The actuator mechanism serves multiple functions: it engages and disengages electrical contacts, positions the moving plate assembly, and controls the timing of de-energization. This multi-functionality reduces the need for separate dedicated components for each operation, thereby limiting the increase in overall device complexity
Solution Approach 2:
The moving plate assembly combines the electrical contact carriers with the mechanical movement structure. The electrical contacts are integrated onto the moving plate rather than being separate components, reducing the total number of parts while maintaining automated engagement functionality
3Ease of manufacture
If moving plate assembly is used for electrical contact engagement, then manufacturing precision requirements are reduced, but reliability deteriorates due to potential misalignment during automated movement
Solution Approach 1:
The system transitions from static electrical contact alignment to dynamic alignment through the moving plate assembly. The actuator controls the movement of the moving plate to ensure proper alignment during engagement, allowing for greater manufacturing tolerances in the stationary components while maintaining reliable electrical contact through controlled motion
Solution Approach 2:
The moving plate assembly acts as an intermediary between the stationary electrical contacts and the module. It provides a controlled movement interface that ensures proper alignment during engagement, compensating for manufacturing variations in the surrounding components
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 automated and secure engagement and disengagement of electrical contacts, preventing backfeed voltage risks and allowing safe module insertion and removal, enhancing operator safety and system reliability.
Implementation Method 1
The actuator may include a linear motor
Data Source
AI summary
A backfeed protection system includes a casing and a moving plate assembly supported by the casing and configured to move with respect to the casing. The moving plate assembly includes at least one electrical contact configured to releasably engage a power distribution element. The backfeed protection system further includes an actuator secured to the casing and the moving plate assembly. The actuator is configured to move the moving plate assembly with respect to the casing between an engaged position in which the at least one electrical contact is engaged with the power distribution element and a disengaged position in which the at least one electrical contact is disengaged from the power distribution unit.