Static Transfer Switch Priority Logic for Catcher UPS Overload Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Catcher UPS systems face the risk of overload when multiple static transfer switches (STSs) transfer loads to a single catcher UPS, leading to potential power failures, which current manual lockout approaches struggle to manage effectively across different failure modes.
Innovation Solution
Each STS is connected via a communications link to broadcast real-time power data, allowing it to evaluate characteristics and determine priority for load transfer to the catcher UPS, preventing overload by ensuring only the highest priority STS transfers loads when the catcher UPS's available power is sufficient, using control logic and communication circuitry to manage instantaneous switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple STSs transfer loads to a single catcher UPS, then the catcher UPS can handle more load scenarios, but the catcher UPS may become overloaded
Solution Approach 1:
The control unit receives real-time power data from the catcher UPS via the communications link, continuously monitoring available power capacity. This feedback mechanism enables dynamic decision-making about load transfer, allowing the STS to adjust its behavior based on current system conditions and prevent overload while maximizing load handling capability
Solution Approach 2:
The system implements dynamic priority assignment and real-time evaluation of power characteristics. The control unit can change the operational state of the STS based on real-time conditions, such as whether to allow load transfer or lock out the STS, making the system adaptable to varying load scenarios without fixed static configurations
2Reliability
If manual lockout approaches are used to prevent STS overload, then overload protection is provided, but the system becomes difficult to sustain across different failure modes
Solution Approach 1:
The control unit automatically evaluates power characteristics, determines priority, and makes lockout or transfer decisions without requiring manual intervention. The system self-manages overload protection by continuously monitoring real-time power data and autonomously adjusting STS operational states, eliminating the need for installers to manually configure different failure modes
Solution Approach 2:
The automated control system handles multiple failure modes and operational scenarios through a single unified approach. The control unit can manage various UPS failure conditions, load priorities, and power characteristics using the same real-time evaluation logic, making the system easy to operate across diverse failure scenarios without requiring mode-specific configurations
3Extent of automation
If real-time power data broadcasting is implemented, then automated priority-based load transfer is enabled, but device complexity increases
Solution Approach 1:
The communications link serves as an intermediary that enables automated control without requiring complex point-to-point connections between all components. The link allows the catcher UPS and STS to exchange real-time power data efficiently, facilitating automated priority-based load transfer through a standardized communication interface that simplifies the overall system architecture
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Technologies for transferring a load by a static transfer switch (STS) to a catcher uninterruptible power supply (UPS) are disclosed. In an illustrative embodiment, each STS in a catcher UPS system monitors an available power of the catcher UPS. The STS determines, in response to a power failure event of an associated UPS, whether a real-time power supplied to a load connected to the STS exceeds the available power of the catcher UPS and whether the STS has priority over each other STS in the system. The STS transfers the load from the associated UPS to the catcher UPS in response to determining that the real-time power supplied to the load does not exceed the available power of the catcher UPS and that the STS has priority over each other STS in the system.