Power Interruption Device Using Phase Difference Arc Detection
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Solution Overview
Problem
Existing power interruption methods fail to rapidly and accurately detect and respond to arcs in electrical loads, leading to potential fires and circuit damage due to delayed power interruption in fault scenarios like wire faults or short-circuits.
Innovation Solution
A power interruption method and device that utilize phase difference measurements between voltage and current signals, rectification, low-pass filtering, and predetermined signal adjustments to generate a control signal for interrupting power supply when an arc is detected, with adjustable thresholds for different load levels and real-time data storage and display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional power interruption methods are used, then the system structure is simple, but the arc detection speed and accuracy are insufficient leading to delayed power interruption
Solution Approach 1:
The detection process is segmented into distinct stages: voltage signal detection, current signal detection, phase difference calculation, and arc determination. Each stage processes specific parameters independently, enabling faster overall detection while maintaining manageable system complexity through modular functional blocks.
Solution Approach 2:
The system transitions from conventional single-parameter detection to multi-dimensional analysis by simultaneously measuring both voltage and current signals and calculating their phase difference. This dimensional expansion from scalar to vector analysis enables rapid arc detection by exploiting the temporal relationship between voltage and current waveforms.
2Measurement precision
If conventional power interruption methods are used, then the device structure is simple, but the measurement precision of arc detection is insufficient
Solution Approach 1:
The system replaces conventional mechanical or simple thermal arc detection mechanisms with electronic signal processing. By using voltage and current sensors coupled with phase difference calculation circuits, the system achieves precise arc detection through electrical measurement rather than mechanical response, significantly improving measurement precision.
Solution Approach 2:
The phase difference calculation serves as an intermediary parameter that mediates between the raw voltage and current measurements and the final arc detection decision. This intermediate computational step transforms complex waveform analysis into a simple threshold comparison, achieving high precision while managing processing complexity.
3Reliability
If rapid power interruption is implemented, then fire prevention capability is improved, but the risk of false tripping increases
Solution Approach 1:
The system continuously monitors the phase difference between voltage and current and compares it against predetermined thresholds. This feedback mechanism enables rapid response to actual arc conditions while the threshold-based decision logic filters out transient variations that would cause false tripping, balancing reliability with false alarm reduction.
Solution Approach 2:
The system changes the detection parameter from simple current magnitude to phase difference between voltage and current. This parameter transformation enables more reliable arc detection because the phase relationship provides specific information about load conditions, allowing the system to distinguish between normal operating variations and actual arc faults, thereby reducing false tripping while maintaining rapid response.
Data Source
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AI summary
Disclosed are a power interruption method and a power interruption device based on power phase measurement and arc detection and a method thereof and disclosed are a power interruption method and a power interruption device which accurately determine, when a value measured by a current transformer (CT), a voltage detector, etc., is input into the main control unit, whether the measured value is a value equal to or more than a predetermined threshold through a comparison between phases of voltage and current to effectively prepare for a disaster such as preventing fire or protecting a subsequent circuit by a rapid and accurate power interruption by arc at a load side.