PDU Outlet Current Sensing for Circuit Breaker Trip Forensics
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Solution Overview
Problem
Conventional power distribution units (PDUs) require manual and time-consuming procedures to determine which electronic device caused an overcurrent protection device (OCPD) trip event, making it difficult to quickly identify and replace faulty devices, especially in data center settings where downtime needs to be minimized.
Innovation Solution
The implementation of current sensors at each electrical outlet in the PDU to measure current characteristics, with a microcontroller processing these measurements to identify which outlet exceeded a specified threshold, thereby automatically determining the cause of the trip event and communicating this information for swift action.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If manual procedures are used to determine which electronic device caused an OCPD trip event, then device complexity is reduced, but time consumption increases significantly
Solution Approach 1:
The patent replaces manual mechanical procedures with electronic automation. Current sensors electronically monitor each outlet, and a microcontroller automatically processes the data to identify the faulty device, eliminating the need for manual testing and significantly reducing identification time.
Solution Approach 2:
The PDU system performs self-diagnosis by automatically detecting which outlet caused the OCPD trip event. The microcontroller analyzes current measurements from all outlets and autonomously identifies the problematic device without requiring external manual intervention.
2Measurement precision
If current sensors are installed at each electrical outlet to measure current characteristics, then measurement precision improves, but device complexity increases
Solution Approach 1:
The microcontroller serves multiple functions: it receives current measurements from all sensors, processes the data, identifies the faulty outlet, and can potentially control outlets. This multi-functionality reduces the need for separate dedicated components for each task, mitigating the complexity increase from adding sensors.
Solution Approach 2:
The patent combines multiple current measurement functions into a single integrated system. Instead of having separate measurement and identification systems, the current sensors and microcontroller work as an integrated unit to simultaneously measure and diagnose, reducing overall system complexity despite adding individual components.
3Productivity
If automated detection system with current sensors is implemented, then productivity improves by quickly identifying faulty devices, but manufacturing complexity increases
Solution Approach 1:
The PDU is divided into modular outlet units, each with its own current sensor. This segmentation allows for standardized manufacturing of individual modules that can be assembled into the complete PDU, making the manufacturing process more manageable despite the increased component count.
Data Source
AI summary
Disclosed are power distribution systems and methods in which a power distribution unit (PDU) is provided with an overcurrent protection device and per-outlet current sensing at each of the multiple electrical outlets of the PDU. The described embodiments enable the identification of the electronic device connected to a specific outlet or electronic device that may have caused the overcurrent protection device to trip. The methods of outlet identification in a PDU having multiple electrical outlets includes detecting whether either a peak current or a half-cycle root mean square (RMS) current at each outlet has exceeded a selected threshold prior to the occurrence of the trip event associated with the overcurrent protection device.