Non-Intrusive Cable Fault Diagnosis Based on Inductive Directional Coupling

Area of Science:

• Electrical Engineering
• Signal Processing

Background:

• Power cable faults pose significant risks to electrical infrastructure.
• Existing non-intrusive fault diagnosis methods, like capacitive coupling, suffer from signal attenuation and impedance mismatch issues.
• Spread Spectrum Time Domain Reflectometry (SSTDR) offers potential for improved fault detection.

Purpose of the Study:

• To develop and validate a novel inductive directional coupling technology for non-intrusive power cable fault diagnosis.
• To overcome the limitations of existing capacitive coupling methods, specifically signal attenuation and power source impedance mismatch.
• To enhance the accuracy and reliability of power cable fault detection systems.

Main Methods:

• An inductive directional coupling technology was developed, incorporating a capacitive trapper.
• The technology is based on Spread Spectrum Time Domain Reflectometry (SSTDR).
• Simulations and experimental tests were conducted on cables with various fault types, comparing results with capacitive coupling methods.

Main Results:

• The proposed inductive coupling approach effectively restricts detection signals from reaching the power source.
• The method successfully eliminates the impact of power source impedance mismatch.
• Experimental results demonstrate the superior effectiveness of the inductive coupling method over capacitive coupling for power cable fault diagnosis.

Conclusions:

• The developed inductive directional coupling technology based on SSTDR is a highly effective method for non-intrusive power cable fault diagnosis.
• This approach offers significant advantages over existing capacitive coupling techniques, particularly in signal integrity and robustness.
• The findings support the adoption of this new technology for improving the reliability and safety of power systems.