Earth Leakage Detection Using Electromagnetic Tracking Signals
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Solution Overview
Problem
Conventional methods for detecting earth leakage points under the TNC grounding system are inaccurate, leading to potential electric shock hazards due to misidentification of leakage locations and inefficient maintenance, especially in urban areas with complex transformer and feeder line configurations.
Innovation Solution
A mobile earth leakage locating apparatus with multiple wet type wheel electrodes that trace the laying paths of phase conductor wires, identify AC mains earth potential peaks, and analyze earth potential polarity to accurately locate leakage sources using electromagnetic tracking signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional detection methods are used to identify earth leakage points, then detection can be performed, but measurement precision is poor leading to misidentification of leakage locations
Solution Approach 1:
The detection process is divided into multiple stages: initial scanning to identify suspicious sections, followed by precise localization within those sections. The apparatus segments the detection task into broad-area scanning using electromagnetic signals, then narrow-area precise measurement using wet wheel electrodes, thereby improving overall measurement precision while maintaining reliability.
Solution Approach 2:
The patent introduces an intermediary detection mechanism using electromagnetic tracking signals and wet wheel electrodes that act as mediators between the leakage source and the detection system. This intermediary approach allows indirect detection of leakage points through electromagnetic field interactions and ground potential measurements, significantly improving identification accuracy without requiring direct contact with the leakage source.
2Measurement precision
If power supply is interrupted to perform leakage detection, then accurate measurement can be achieved, but productivity decreases due to maintenance downtime
Solution Approach 1:
The system performs preliminary scanning and identification of suspicious leakage sections using electromagnetic field detection before conducting precise measurements. This preliminary action allows the system to target only specific areas for detailed inspection, enabling accurate leakage point identification while minimizing the overall detection time and maintaining power supply continuity.
Solution Approach 2:
The detection apparatus employs periodic electromagnetic signal transmission and measurement cycles, allowing continuous monitoring without interrupting power supply. The system periodically emits electromagnetic signals, measures ground potential variations, and updates leakage location identification in real-time, thereby maintaining both measurement precision and productivity.
3Adaptability or versatility
If complex transformer and feeder line configurations are present in urban areas, then power distribution coverage is improved, but device complexity increases making detection more difficult
Solution Approach 1:
The detection apparatus is designed with multi-functionality to handle various configuration scenarios. It can detect electromagnetic signals from different types of conductors (phase wires, neutral wires, ground wires), adapt to different grounding systems (TN-C, TN-S, TT), and operate in diverse urban environments with complex transformer and feeder line arrangements, thereby improving adaptability without proportionally increasing device complexity.
Solution Approach 2:
The system transitions from traditional one-dimensional ground potential measurement to three-dimensional electromagnetic field detection by incorporating electromagnetic signal tracking in addition to ground potential measurements. This dimensional expansion allows the system to locate leakage points more accurately in complex urban configurations by analyzing spatial distribution of electromagnetic fields and ground potentials across multiple dimensions.
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
Enables precise identification of earth leakage points without interrupting power supply, reducing maintenance time and costs, preventing electric shocks, and ensuring safe and efficient repair operations.
Implementation Method 1
multiple wet type wheel electrodes contacting the earth to locate ground potential increasing points while tracing laying paths of an electric line
Implementation Method 2
measuring earth potential while moving along a laying path of phase conductor wires
Data Source
AI summary
A method for detecting an electric leakage point without interrupting a power supply is provided. The method includes transmitting a unipolar direct current (DC) survey voltage signal to an electric wire of the power supply. The method includes transmitting a chain of electromagnetic wave signals generated around the electric wire to synchronize a reference time to measure an earth potential of the unipolar DC voltage signal and capture an electromagnetic tracking signal. The method includes tracing a buried route of the electric wire by analyzing the electromagnetic tracking signal according to the reference time. The method includes measuring the earth potential of the unipolar DC voltage signal on the ground according to the reference time. The method includes locating the electric leakage point by identifying a polarity of the unipolar DC voltage signal.