Cable Fault Diagnosis Using Correlation-Based Signal Extraction
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Solution Overview
Problem
Conventional cable fault diagnosis methods face challenges in accurately determining fault type and location due to overlapping application and reflected signals, or weak reflected signals caused by proximity or remoteness, leading to reduced accuracy and reliability.
Innovation Solution
A cable fault diagnosis system that generates a Gaussian-enveloped linear chirp signal, calculates a correction location using a correlation function, and derives a correction signal by removing the application signal from the reflected signal, allowing for precise determination of fault location and type through time-domain analysis and propagation velocity calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reflectometry is used to diagnose cable faults, then fault detection capability is provided, but measurement precision deteriorates when application signal and reflected signal overlap due to proximity of fault location to application location
Solution Approach 1:
The patent extracts the application signal component from the received signal by calculating the correlation function between the application signal and received signal, then subtracting the correlated component. This extraction allows the reflected signal to be isolated even when signals overlap, resolving the measurement precision issue near the application location.
Solution Approach 2:
The patent performs preliminary correlation analysis before fault diagnosis to identify and remove the application signal component. By conducting this preliminary extraction action, the system prepares the signal for accurate fault detection, preventing measurement errors before they occur.
2Reliability
If reflectometry is used to diagnose cable faults, then fault detection capability is provided, but measurement precision deteriorates when reflected signal intensity is weak due to remoteness of fault location from application location
Solution Approach 1:
The patent extracts and removes the application signal component through correlation analysis, which enhances the visibility of the weak reflected signal. By eliminating the interfering application signal component, the system can accurately detect and measure weak reflected signals from distant fault locations.
Solution Approach 2:
The correlation function acts as an intermediary tool that processes the received signal. It separates the application signal component from the reflected signal component, enabling accurate measurement of weak reflected signals that would otherwise be buried in noise or obscured by signal overlap.
3Reliability
If conventional reflectometry is used, then fault diagnosis is performed, but accuracy and reliability of cable diagnosis results deteriorate due to coupling distance measurement errors
Solution Approach 1:
The patent extracts the application signal component using correlation analysis before performing fault diagnosis. This extraction eliminates the source of measurement errors by removing the interfering signal component, thereby improving both the accuracy and reliability of coupling distance measurement and overall fault diagnosis results.
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
This approach enhances the accuracy and reliability of fault detection even when signals overlap or the reflected signal is weak, improving the precision of fault type and location identification in cable diagnosis.
Implementation Method 1
a certain application signal is transmitted to the wire, a reflected signal, which has been reflected and returned, is measured
Implementation Method 2
derive a correction location, at which a function value derived from a prescribed correlation function has a global maximum for the application signal and the reflected signal
Implementation Method 3
derive a time delay value between the correction location of the correction signal and the reflection location of the reflected signal using a prescribed correlation function for the generated correction signal and the reflected signal and then derives the distance between the correction location and the acquisition location on the basis of the derived time delay value and the propagation velocity
Data Source
AI summary
Disclosed herein is a cable fault diagnosis system and method, wherein when an application signal and a reflected signal overlap each other due to the proximity of a fault location to an application location or when the intensity of the reflected signal is weak and thus falls outside of a prescribed fault diagnosis range due to remoteness of the fault location from the application location, a correction location, at which a correlation function value has a global maximum, is derived on the basis of a prescribed correlation function for an application signal applied to a cable to be inspected and an acquired reflected signal, a correction signal, which is a reflected signal from which the application signal is removed at the derived correction location, is calculated, the distance between the correction location and the acquisition location is derived on the basis of a time delay, which is calculated on the basis of the calculated correction signal and the reflected signal at the acquisition location, and a propagation velocity, and therefore, even when the application signal and the reflected signal overlap due to the proximity of the fault location to the application location, the fault type and the fault location of the cable to be inspected may be accurately detected, and even when the intensity of the reflected signal is weak due to remoteness of the fault location from the application location or due to a minute fault level, accuracy and reliability of the fault type determination and the fault location detection for the cable to be inspected may be improved.