Cable Conductor Disconnection Detection Using Vibration Frequency Analysis
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Solution Overview
Problem
Existing methods struggle to detect conductor disconnections with high sensitivity, especially at early stages, due to small resistance value increases that are masked by noise, leading to potential device malfunctions.
Innovation Solution
A method involving applying a periodic vibration to a cable conductor, measuring the time-series resistance value, performing frequency analysis, and extracting resistance value variations at specific frequencies to detect disconnections based on these variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If resistance value measurement is used to detect conductor disconnection, then the detection method is simple, but the detection sensitivity is insufficient at early stages due to small resistance increases being masked by noise
Solution Approach 1:
The patent applies periodic mechanical vibration to the cable conductor to induce relative movement between conductor strands. This vibration causes resistance value fluctuations that are significantly larger than noise when disconnection occurs, enabling high-sensitivity detection. The vibration frequency is controlled to be within a specific range (1-100 Hz) to optimize the detection effect while avoiding resonance that could damage the cable.
Solution Approach 2:
The patent employs periodic vibration excitation applied to the cable conductor, creating cyclic resistance variations that can be easily distinguished from random noise through frequency analysis. The periodic nature of the excitation allows the use of spectral analysis methods to extract disconnection signals at the excitation frequency, significantly improving detection sensitivity compared to static resistance measurement.
2Reliability
If conventional resistance measurement is used, then no additional excitation equipment is needed, but early-stage disconnection cannot be detected due to noise interference
Solution Approach 1:
The patent introduces vibration as an intermediary physical quantity that mediates between the disconnection state and the resistance measurement. The vibration-induced mechanical movement of conductor strands creates a放大 effect on resistance changes, transforming undetectable small resistance variations into measurable signals that stand out from noise.
3Measurement precision
If periodic vibration excitation is applied, then detection sensitivity is greatly improved, but the device complexity and examination time increase
Solution Approach 1:
The patent replaces complex signal processing methods with frequency domain analysis. By applying periodic vibration and analyzing the frequency spectrum of resistance variations, the system can quickly identify disconnection signals at the excitation frequency, reducing examination time compared to time-domain analysis methods while maintaining high sensitivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables highly sensitive detection of conductor disconnections, reducing noise interference and allowing early-stage detection without requiring initial resistance values, thus improving device reliability and reducing examination time.
Implementation Method 1
performing an excitation to apply a periodic vibration at an arbitrary examined portion in a longitudinal direction of the cable
Implementation Method 2
measuring a time-series resistance value of the conductor by the excitation
Implementation Method 3
performing a frequency analysis of the measured time-series resistance value of the conductor
Data Source
AI summary
A method for detecting a disconnection of a conductor of a cable includes performing an excitation to apply a periodic vibration at an arbitrary examined portion in a longitudinal direction of the cable, measuring a time-series resistance value of the conductor by the excitation, performing a frequency analysis for the measured time-series resistance value of the conductor, extracting a resistance value variation component at an exciting frequency corresponding to an operation period of the excitation from a result of the frequency analysis, and detecting the disconnection in the conductor at the examined portion based on a magnitude of the extracted resistance value variation component.