Current Sensor Cable Identification in MV LV Networks
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Solution Overview
Problem
The complexity of low voltage (LV) networks, including buried cables and disparate maintenance, makes it difficult to trace connections between MV/LV substations and consumer points, leading to inefficiencies in troubleshooting, energy theft detection, and network quality assessment.
Innovation Solution
A method involving current sensors and processing modules that measure current variations on cables, allowing for connection and disconnection operations to identify cable associations with consumer points, and a device with telecommunication means to determine sensor selectivity based on standard current profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current sensors are installed on all cables and continuous monitoring is performed, then the precision of cable connection identification is improved, but the complexity of the system increases
Solution Approach 1:
The patent implements periodic connection/disconnection operations of electrical loads at consumer points rather than continuous monitoring. Current sensors take measurements at specific time intervals when loads are switched, creating periodic measurement cycles that reduce data volume while maintaining identification precision through targeted sampling of current variations
Solution Approach 2:
The system uses the existing electrical loads at consumer points to generate the current variations needed for identification. Instead of requiring separate test equipment or active probing, the natural switching of consumer loads serves the dual purpose of normal operation and cable identification, eliminating the need for additional external testing devices
2Measurement precision
If connection and disconnection operations are performed to identify cables, then the accuracy of consumer point location is improved, but the loss of time in operational interruptions increases
Solution Approach 1:
The patent performs connection/disconnection operations on only a subset of electrical loads rather than all loads simultaneously. By selectively switching individual loads or small groups of loads in sequence, the system achieves sufficient current variation data for cable identification while minimizing the number of operational interruptions and reducing total time lost
Solution Approach 2:
The system performs cable identification operations during periods of low network activity or scheduled maintenance windows when the impact of operational interruptions is minimized. Current sensors are pre-installed on cables before identification operations, and the connection/disconnection testing is coordinated with planned maintenance schedules to reduce disruption to normal operations
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 method enables precise identification of cable connections, improving maintenance, network quality estimation, and energy theft detection by correlating sensor measurements with known power consumption patterns.
Implementation Method 1
current sensors, each current sensor being adapted to measure the current flowing in a respective associated cable
Data Source
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Figure 3~4
AI summary
The method involves implementing an operation command at consumer point selected from a set of consumer points (10a1-10a5, 10b1-10b4), where the command is utilized to connect/disconnect an electric current distributing system with an electric load associated with the point. Current sensors (21a1-21a3, 21b1-21b3) are selected based on respective measurements made by the sensors during command implementation. A profile-type of current fluctuation at the sensors associated with cables (20a1-20aN, 20b1-20bN) connecting a central node to the point is determined based on a controlled operation. The central node is designed as a medium voltage station. Independent claims are also included for the following: (1) a processing device for an electric current distributing system (2) an electric current sensor.