Digital Twin Model for High-Voltage Cable Fault Location
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Solution Overview
Problem
Existing methods for locating fault points on high-voltage three-phase AC cables are either inefficient or require complex calculations, often needing additional information such as terrain type and ground resistance.
Innovation Solution
A method and system that measure conductor and shield currents at both ends of a high-voltage cable, determine the conductor and main section in fault, and use a digital twin model of the shields to locate the fault point, eliminating the need for terrain-specific models and ground resistance calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional methods are used to locate fault points on high-voltage cables, then fault detection can be performed, but the process requires complex calculations and additional information such as terrain type and ground resistance
Solution Approach 1:
The patent creates a digital twin model that replicates the electrical characteristics of the cable shields and uses this virtual copy to perform fault location calculations. Instead of directly solving complex equations for the actual physical system, the method transfers the problem to the digital twin model, where calculations are simplified while maintaining accuracy.
Solution Approach 2:
The patent introduces an intermediary digital twin model between the measurement data and the fault location result. This intermediary layer processes the complex relationships between shield currents, conductor currents, and fault impedance, converting them into a simplified form that can be solved without requiring detailed terrain or ground resistance information.
2Measurement precision
If traditional fault location methods are used, then fault detection is possible, but the process is time-consuming and not suitable for real-time applications
Solution Approach 1:
The patent performs preliminary actions by pre-building the digital twin model with all necessary electrical parameters and relationships before a fault occurs. When a fault happens, the system only needs to input measured currents and query the pre-configured model, eliminating the need for time-consuming calculations during the actual fault event.
Solution Approach 2:
The patent replaces traditional iterative numerical methods with a direct query approach using the digital twin model. Instead of mechanically iterating through complex calculations to find the fault location, the system substitutes this with a direct lookup or simple calculation based on the pre-established model relationships, dramatically reducing computation time.
3Measurement precision
If terrain-specific models are used for fault location, then accuracy may be improved for specific conditions, but the system becomes sensitive to terrain variations and requires different models for different environments
Solution Approach 1:
The patent creates a universal digital twin model that can handle various terrain conditions through a single unified approach. The model incorporates general electrical characteristics of cable shields that apply across different environments, making the system adaptable to various terrains without requiring separate models for each condition.
Solution Approach 2:
The patent extracts and removes terrain-specific parameters from the fault location calculation process. By focusing only on the essential electrical characteristics of the cable shields and conductors that are independent of terrain, the method eliminates sensitivity to terrain variations while maintaining accuracy.
4Measurement precision
If ground resistance values are required for fault location calculations, then traditional methods can proceed, but the system requires additional measurement equipment and calibration procedures
Solution Approach 1:
The patent makes the system self-sufficient by using only the currents already present in the cable conductors and shields during normal operation. The digital twin model processes these self-generated signals to determine fault location, eliminating the need for external measurement equipment or additional calibration procedures to obtain ground resistance values.
Data Source
AI summary
A method for locating a fault point (F) in a high-voltage three-phase AC cable (1) with a cross bonding or solid bonded connection system. The method includes determining the conductor (R, S, T) in fault. In the event that the cable (1) includes more than one main section (MP1, MP2, MP3), determining the main section (MP1, MP2, MP3) in fault, and locating the fault point (F) by means of a model of the shields (SA, SB, SC; SR, SS, ST) of the main section (MP1, MP2, MP3) in fault, taking into account that the shields (SA, SB, SC; SR, SS, ST) are attached to one another at the ends of said main part (MP1, MP2, MP3).