Moving Plate Backfeed Protection for UPS Static Bypass Modules
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Solution Overview
Problem
Existing uninterruptible power supply (UPS) systems lack effective automated solutions for preventing arc flash incidents during module insertion or removal in powered systems, particularly in larger setups where static bypass modules require manual power-down procedures.
Innovation Solution
A backfeed protection system with automated static bypass module connection, utilizing a moving plate assembly, thyristor assemblies, and modular locking switches, along with a linear motor, to ensure safe engagement and disengagement of electrical contacts with busbars, preventing unwanted power flow and allowing for safe module insertion/removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If manual power-down procedures are used for static bypass module insertion or removal, then operator safety is improved, but system productivity deteriorates due to required system shutdown
Solution Approach 1:
The system performs preliminary actions by automatically de-energizing specific circuit breakers (CB1, CB2, CB3) and isolating the static bypass module before the operator inserts or removes the module. This preliminary isolation prevents arc flash incidents while allowing the rest of the UPS system to remain operational, thus maintaining productivity.
Solution Approach 2:
The control unit acts as an intermediary between the operator and the power distribution system. It automatically manages the complex sequence of breaker operations and isolations required for safe module insertion/removal, eliminating the need for manual power-down procedures while maintaining safety.
2Productivity
If automated connection systems are implemented for static bypass modules, then system productivity is improved by allowing operation without power-down, but device complexity increases
Solution Approach 1:
The control unit is designed to perform multiple functions: it monitors system status, automatically operates multiple circuit breakers, manages thyristor assemblies, and coordinates the isolation of static bypass modules. This multi-functionality consolidates what would otherwise require multiple separate devices into a single integrated control system.
Solution Approach 2:
The system performs self-service by automatically executing the complex sequence of safety operations without operator intervention. The control unit autonomously manages breaker operations and thyristor control, reducing the need for complex manual procedures while maintaining safety standards.
3Reliability
If multiple circuit breakers are automatically operated for backfeed protection, then safety is improved, but ease of operation deteriorates due to complex manual procedures
Solution Approach 1:
The control unit serves as an intermediary that automatically manages the complex coordination of multiple circuit breakers (CB1, CB2, CB3) and thyristor assemblies. It translates a simple operator action (module insertion/removal) into the complex sequence of breaker operations required for reliable backfeed protection, eliminating procedural complexity from the operator's task.
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
Enables safe and automated operation of UPS systems by ensuring positive engagement and disengagement of electrical contacts, preventing arc flash incidents and allowing for module insertion/removal without powering down the system, enhancing operator safety and system reliability.
Implementation Method 1
an actuator secured to the casing and the moving plate assembly, the actuator being configured to move the moving plate assembly with respect to the casing
Implementation Method 2
the moving plate assembly including several thyristor assemblies, each having electrical contacts, e.g., jaws, configured to releasably connect to busbars
Data Source
Figure 1~2
Figure 3~4
Figure 5~6C
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.