High-Voltage Cable Shield Fault Localization Using Synchronized Timing
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Solution Overview
Problem
Current methods for locating short circuits between the conductor and the electrically conductive shield of high-voltage power cables are inaccurate and cannot predict the failure time or location with certainty, especially during operation, and offline fault location methods require cable disconnection, making them inefficient.
Innovation Solution
A system and method using synchronized measuring devices to detect and analyze current patterns in the electrically conductive shield and ground lines, employing high sampling rates and data analysis, including AI or machine learning, to determine the time and location of short circuits, even during operation, by accounting for impedance and propagation speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If offline fault location methods are used to locate short circuits, then measurement precision is improved, but productivity deteriorates because cable disconnection is required
Solution Approach 1:
The system performs preliminary setup by installing synchronized measuring devices and establishing baseline current patterns before faults occur. This allows the system to be ready for immediate fault detection without requiring cable disconnection, thus maintaining productivity while enabling precise fault location when needed
Solution Approach 2:
The patent replaces mechanical cable disconnection with electrical signal analysis. Instead of physically accessing the cable (mechanical approach), the system uses current pattern analysis and signal processing (electrical approach) to locate faults while the cable remains connected and energized, thereby maintaining energy transmission continuity
2Measurement precision
If conventional current measurement methods are used, then device complexity is reduced, but measurement precision deteriorates due to inability to detect fault location accurately
Solution Approach 1:
The system divides the cable into multiple segments by placing measuring devices at different locations. Each measuring device independently monitors its local segment, and the combination of measurements from multiple segments enables precise fault localization through comparison and triangulation, improving measurement precision while distributing system complexity across multiple simple units
Solution Approach 2:
The system continuously monitors current patterns and provides feedback when deviations from normal operation are detected. This feedback mechanism triggers detailed analysis and fault localization only when necessary, improving measurement precision for actual faults while minimizing the operational impact of the monitoring system during normal conditions
3Measurement precision
If high sampling rates are used for current detection, then measurement precision is improved, but use of energy increases
Solution Approach 1:
The system uses periodic sampling of current patterns at high rates only during fault detection events rather than continuous high-rate sampling. During normal operation, sampling occurs at lower rates, reducing energy consumption. When faults are detected, the system temporarily increases sampling rate to capture detailed fault characteristics, achieving high measurement precision only when needed
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 allows for precise localization of short circuits during operation with high accuracy, improving upon existing methods by enabling continuous energy transmission and reducing excavation costs by accurately identifying the faulty segment without disconnecting the cable.
Implementation Method 1
a measuring device for detecting an electrical current flowing in the electrically conductive shield and/or an electrical current flowing in a ground line connecting the electrically conductive shield and ground and the time of its occurrence
Implementation Method 2
providing at least two measuring devices arranged on the high-voltage cable at a known distance from one another or from the ends of the high-voltage cable, which have synchronized timers
Implementation Method 3
The analysis unit supplies a calculation unit with at least the value of the timer, which was determined over time after the occurrence of a current exceeding a threshold value
Data Source
Figure 1~6
Figure 3a~3d
Figure 4a~4d
AI summary
A method for locating a short circuit between a conductor and an electrically conductive shield of a high-voltage cable comprises providing at least two measuring devices arranged at a known distance from each other on the high-voltage cable. These measuring devices include synchronized timers and a measuring device for detecting an electric current flowing in the shield and/or a grounding conductor connecting the shield and earth. The measuring device transmits pairs of current measurements and corresponding timer values to an analysis unit. Upon the occurrence of a current exceeding a threshold value and/or a current profile fulfilling certain specifications over time, the analysis unit provides a processing unit with the corresponding timer values and information about the measurement location where the first effects of the short circuit occurred.The calculation unit calculates the location of a short circuit from the known distance between the measuring devices and a difference between the values of the synchronized timers.