Arc Crosstalk Signal Identification via Vector Analysis
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Solution Overview
Problem
Conventional arc detection devices frequently perform false tripping operations due to their inability to accurately distinguish between arc signals and crosstalk signals in bypass circuits, leading to safety hazards and limited adoption.
Innovation Solution
A new sampling circuit method using a Y-shaped configuration with vector analysis to differentiate between arc signals in main circuits and crosstalk signals in bypass circuits by extracting amplitude ratios and phase differences from voltages across sampling resistors, processed in real-time by a digital signal processing unit and neural network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional arc detection methods are used, then arc signals can be detected, but false tripping operations occur due to inability to distinguish crosstalk signals
Solution Approach 1:
The patent divides the single current signal into two separate sampling signals by introducing a Y-shaped sampling circuit with two sampling resistors. This segmentation allows independent analysis of signal components from different circuits (main circuit and bypass circuit), enabling differentiation between arc signals and crosstalk signals through vector analysis of the separated signal paths.
Solution Approach 2:
The patent transitions from analyzing a single-dimensional current waveform to a two-dimensional vector analysis by extracting both amplitude ratio and phase difference features from the two sampling signals. This dimensional expansion provides additional discrimination capabilities to distinguish between arc signals and crosstalk signals that cannot be differentiated by waveform alone.
2Measurement precision
If single waveform-based detection is used, then device complexity is low, but measurement precision of signal identification is insufficient
Solution Approach 1:
The patent replaces traditional mechanical waveform analysis methods with digital signal processing and vector analysis algorithms. By using a digital signal processing unit to calculate amplitude ratios and phase differences, the system achieves higher measurement precision while maintaining relatively simple hardware structure through software-based intelligent analysis.
3Productivity
If conventional detection devices are deployed, then installation is simple, but false tripping operations reduce productivity
Solution Approach 1:
The patent implements self-service by using the detection device to automatically analyze and differentiate between arc signals and crosstalk signals through embedded vector analysis algorithms. The system autonomously makes tripping decisions based on the calculated amplitude ratio and phase difference, eliminating the need for manual intervention and reducing false tripping operations that would otherwise require operational adjustments.
Data Source
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AI summary
A vector analysis calculation-based arc crosstalk signal identification method. A new sampling circuit manner is proposed in the method, wherein a current signal is sampled on zero and live lines, and the signal is converted into two digital signals with a sampling rate of 200 MHz by means of a dual-channel ADC, and the digital signals are sent to a hardware digital signal processing unit. Five pass bands are selected to perform band-pass filtering on the two signals separately to filter out interference signals outside the pass bands. Time-sharing processing and vector analysis are performed on the filtered signals, and the amplitude ratio and fluctuation characteristics of two resistor terminal voltages, as well as the phase difference between shunt resistor and inductor terminal voltage signals are extracted as crosstalk feature quantities. According to a zero-crossing signal, a system segments the feature quantities extracted by a hardware processing module and sends same to a neural network for classification and determination, which may effectively distinguish the present circuit arc signal from a bypass crosstalk signal.