Dynamic Overcurrent Detection for Transient Current Immunity
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Solution Overview
Problem
Existing overcurrent detection methods tend to cause nuisance tripping due to spikes or capacitive inrush currents, and are not robust enough to handle transient currents and unusual current patterns, especially in DC applications.
Innovation Solution
An overcurrent detector that combines the time integral of the current with the actual current value, using a comparator unit to trigger based on a dynamically determined threshold level, allowing for flexible adaptation to different tripping requirements and unusual current patterns, and can be integrated into circuit breakers for robust operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If threshold check or rate of current rise analysis is used for fault detection, then fast response to overcurrent is achieved, but nuisance tripping occurs due to spikes or capacitive inrush current
Solution Approach 1:
The patent combines multiple detection methods (threshold check, rate of current rise analysis, and integration of current samples) into a unified detection system that evaluates multiple criteria simultaneously, allowing fast response while filtering out transient disturbances through the integration component
Solution Approach 2:
The patent implements dynamic threshold adjustment based on the actual current measurement signal, allowing the threshold level to adapt to different operating conditions and current patterns, thereby preventing nuisance tripping during transient states while maintaining fast response during actual faults
Data Source
AI summary
An overcurrent detector with an electric line and a sensor for monitoring an electric current in the line and outputting a measurement signal, and an integral-unit adapted to integrate an interval of consecutive values of the measurement signal and outputting an integrator-signal, the detector comprises a comparator unit for comparing a value of the integrator-signal with a threshold level and outputting a trigger signal, with the detector further comprises a threshold level determination unit, an input being connected to the sensor for receiving an actual measurement signal, and with an output being connected to the comparator unit, proving the comparator unit with the threshold level, and that the threshold level determination unit is adapted to determine the threshold level in dependence on the value of the actual measurement signal.