UPS Output Current Boost for Three-Phase Short-Circuit Tripping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In three-phase power systems, during a short-circuit without neutral, the limited output current supplied by UPS systems is insufficient to trip downstream protection devices, potentially leading to damage of faulty loads and system components due to inadequate current for protection.
Innovation Solution
The power converter system increases output current during a three-phase short circuit without neutral, allowing the UPS to supply sufficient current to trip the downstream protection device by switching from three-phase to two-phase output power, thereby isolating the faulty load and preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UPS system provides standard three-phase output power, then the system operates efficiently under normal conditions, but insufficient current is supplied during short circuit to activate protection mechanisms
Solution Approach 1:
The system operates in different modes depending on the system state. Under normal conditions, it provides standard three-phase output power for efficient operation. Upon detecting a three-phase short circuit without neutral, it dynamically switches to an enhanced current mode that provides sufficient current to trip the downstream protection device, thus adapting productivity to reliability needs.
Solution Approach 2:
The system changes its operational parameters based on the detected fault condition. During normal operation, it maintains standard voltage and current parameters for efficiency. When a short circuit is detected, it modifies the current parameter to provide enhanced current capability specifically for the faulty phase, enabling protection device operation while maintaining overall system efficiency.
Data Source
AI summary
Systems, methods, and computer-readable mediums include detecting and eliminating a three-phase without neutral short-circuit in a load supplied by a power converter. After detecting the short circuit, the current at an output conductor for one of the three-phases is stopped and then resumed after a sufficient amount of current causes a downstream protection device of the faulty load to trip.