Arc-Fault Wiring Control to Prevent In-Rush False Tripping
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Solution Overview
Problem
Switched electrical devices, such as GFCI and AFCI, often trip unnecessarily due to misidentification of in-rush conditions, steady-state conditions, impulse conditions, or volatility conditions, leading to unwarranted disconnections.
Innovation Solution
A wiring device with an interrupting device and a controller that monitors current cycles to differentiate between in-rush, steady-state, impulse, and volatility conditions using RMS value and correlation coefficient analysis, preventing tripped conditions when appropriate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the controller monitors current cycles to identify in-rush conditions, then false tripping is reduced, but device complexity increases
Solution Approach 1:
The controller segments the current monitoring function into distinct analytical components: RMS value calculation, correlation coefficient determination, decay progression analysis, and condition identification modules. Each component handles a specific aspect of the analysis, making the overall complex task manageable and maintainable while achieving accurate false tripping reduction.
Solution Approach 2:
The system introduces intermediate computational variables (RMS values, correlation coefficients, decay envelopes) that serve as mediators between the raw current signal and the final tripping decision. These intermediaries simplify the decision-making process by transforming complex current waveforms into standardized metrics that can be compared against predefined thresholds.
2Measurement precision
If the system uses RMS value and correlation coefficient analysis, then measurement precision is improved, but computational requirements increase
Solution Approach 1:
The system applies partial analysis in real-time (calculating only essential RMS and correlation metrics) and performs more comprehensive analysis only when anomalies are detected. This approach maintains high measurement precision for critical decisions while minimizing computational energy consumption during normal steady-state operation.
Data Source
AI summary
A wiring device including an interrupting device and a controller. The interrupting device electrically connecting one or more line terminals to one or more load terminals when the interrupting device is in a reset condition and disconnecting the line terminals from the load terminals when the interrupting device is in a tripped condition. The controller has an electronic processor and a memory. The controller is configured to monitor a current of the one or more line terminals, identify a presence of an in-rush condition, wherein an in-rush of the current exists when the one or more cycles of current conform with a decay progression envelope, and prevent the tripped condition upon identifying the in-rush condition.