PDU Outlet Current Sensing for Breaker Trip Forensics
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Solution Overview
Problem
Conventional power distribution units (PDUs) require manual and time-consuming procedures to identify which electronic device caused an overcurrent protection device (OCPD) trip event, often failing to reliably determine the faulty device, especially in cases of transient events.
Innovation Solution
The PDU is equipped with current sensors at each outlet to measure and compute current characteristics, using a forensic algorithm to determine which device exceeded a threshold, thereby automatically identifying the cause of the trip event and communicating this information to minimize downtime and electrical hazards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual testing procedures are used to identify faulty devices, then the PDU can determine the cause of trip events, but the process is time-consuming and unreliable for transient events
Solution Approach 1:
The patent applies preliminary action by continuously monitoring and recording current characteristics at each outlet before trip events occur. Current sensors continuously measure and store current data, so when a trip event happens, the system already has pre-captured data to analyze, eliminating the need for manual testing and enabling immediate identification of the faulty device.
Solution Approach 2:
The patent replaces manual mechanical testing procedures with an automated electronic monitoring system. Current sensors, processors, and algorithms automatically detect and analyze trip event causes, substituting human-operated manual testing with an automated electromechanical system that provides both higher reliability and faster response.
2Reliability
If current sensors are installed at each outlet to enable automatic detection, then the identification reliability improves, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the PDU into multiple independent monitoring zones, with each outlet equipped with its own current sensor and associated processing logic. This modular segmentation allows the system to independently analyze current characteristics at each outlet, improving reliability through distributed monitoring while managing complexity through standardized modular units.
Solution Approach 2:
The patent applies universality by designing a standardized current monitoring module that can be applied to each outlet. The same current sensor, processing algorithm, and analysis methodology are universally applied across all outlets, which improves reliability through consistent monitoring while managing complexity through reuse of identical components and logic.
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.