High-Voltage Cable Fault Severity Diagnosis via Compensation Curves
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Solution Overview
Problem
Traditional Frequency Domain Reflectometry (FDR) methods for long-distance high-voltage cable fault detection face challenges in accurately determining fault severity due to signal dispersion and attenuation, leading to misjudgment of fault degrees and inadequate maintenance measures.
Innovation Solution
A method and device that utilize frequency-domain incident signals, time-frequency transformations, and attenuation characteristic parameters to obtain cable fault positioning and compensation curves, enabling accurate determination of fault severity through enhanced diagnosis curves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional FDR method is used for long-distance high-voltage cable fault location, then fault position can be located, but signal dispersion and attenuation cause serious reduction in peak amplitude, making it impossible to accurately determine fault severity
Solution Approach 1:
The patent applies parameter changes by transforming the frequency-domain incident signal into an equivalent time-domain incident signal through time-frequency transformation. This transformation changes the domain parameter from frequency to time, enabling the system to compensate for signal attenuation effects and accurately determine fault severity even for distant fault points where traditional FDR fails.
Solution Approach 2:
The patent introduces an intermediary compensation curve that represents the attenuation characteristics of the cable. This compensation curve acts as a mediator between the measured FDR positioning curve and the actual fault severity, allowing the system to correct for signal attenuation and dispersion effects to accurately assess fault severity.
2Measurement precision
If traditional FDR method is used, then fault positioning curve can be obtained, but attenuation characteristic cannot be compensated, leading to misjudgment of fault degree
Solution Approach 1:
The patent applies preliminary action by calculating the attenuation characteristic parameter of the cable before performing fault diagnosis. The compensation curve is prepared in advance based on the cable's attenuation characteristics, allowing the system to pre-compensate for signal attenuation effects when analyzing the FDR positioning curve, thereby preventing misjudgment of fault severity.
Solution Approach 2:
The patent implements feedback by using the calculated attenuation characteristic parameter to generate a compensation curve that feeds back into the fault diagnosis process. This compensation curve provides corrective information that adjusts the interpretation of the FDR positioning curve, ensuring accurate fault severity determination despite signal attenuation.
3Adaptability or versatility
If wide-frequency test is performed to locate potential defects, then fault position can be identified, but signal dispersion reduces peak amplitude for distant faults
Solution Approach 1:
The patent applies dimensionality change by performing time-frequency transformation that moves the analysis from the frequency domain to the time domain. This dimensional transformation allows the system to maintain wide-frequency detection coverage while simultaneously achieving accurate fault severity measurement, as the time-domain representation preserves attenuation information that is lost in traditional frequency-domain analysis.
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
Improves the accuracy of long-distance high-voltage cable fault degree diagnosis, ensuring correct maintenance actions and maintaining the safe and stable operation of electrical power systems.
Implementation Method 1
The FDR is based on the traveling wave reflection principle. By measuring the frequency domain response characteristics of the cable head-end and using the time-frequency transformation algorithm, the equivalent time-domain response characteristics of the cable head-end are obtained.
Implementation Method 2
By measuring the frequency domain response characteristics of the cable head-end and using the time-frequency transformation algorithm, the equivalent time-domain response characteristics of the cable head-end are obtained.
Data Source
AI summary
A long-distance high-voltage cable fault degree detection method. A cable fault positioning curve is obtained by using a frequency-domain reflection method, and a cable fault positioning compensation curve is determined by means of theoretical calculation in combination with the parameters of a frequency-domain incident signal, cable structure parameters, and characteristic parameters of each layer of materials of the field test; furthermore, a cable fault diagnosis curve is determined on the basis of the cable fault positioning curve and the cable fault positioning compensation curve, the severity of the fault is determined by means of the amplitude of a peak point of the cable fault diagnosis curve, and the accuracy of long-distance high-voltage cable fault degree diagnosis is effectively improved.