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Published on: September 30, 2019
Quasi-Distributed Partial Discharge Monitoring System with Remote Demodulation Based on DFB-FL/Interferometer Hybrid
Yuelan Lu1, Qibing Shao2, Qun Yu3
1School of Low-Altitude Technology and Electronic Information, Guangdong University of Science and Technology, Dongguan 523668, China.
Nanomaterials (Basel, Switzerland)
|August 12, 2026
Summary
This study introduces a novel quasi-distributed sensing system for detecting partial discharge (PD) in submarine cables. The system uses fiber optic interferometers and distributed feedback fiber lasers (DFB-FLs) for highly sensitive, multi-location monitoring.
Area of Science:
- Electrical Engineering
- Materials Science
- Optical Sensing
Background:
- Submarine cable joints are critical failure points for partial discharge (PD).
- Existing single-point detection methods lack comprehensive coverage.
- Viscoelasticity in insulation limits acoustic sensing range.
Purpose of the Study:
- To develop a quasi-distributed remote demodulation sensing system for long-distance PD detection.
- To overcome limitations of single-point measurements in submarine cable joints.
- To enhance online monitoring capabilities for high-voltage submarine cables.
Main Methods:
- Proposed a quasi-distributed sensing system integrating fiber optic interferometers and distributed feedback fiber lasers (DFB-FLs).
- Utilized micro-strain induced by acoustic fields from PD to modulate optical wave phase shifts.
- Investigated three fiber coil configurations (solid-wound, etc.) for enhanced acoustic sensitivity.
- Performed theoretical analysis on sensitivity dependence on unbalanced arm length and experimental validation.
Main Results:
- The solid-wound fiber coil configuration demonstrated the highest amplitude and broadest bandwidth, with an optimal response around 50 kHz.
- Minimum detectable discharge levels reached 6.75 pC (DFB-FL) and 12.66 pC (fiber coil) inside the metallic sheath.
- Outside the sheath, minimum detectable levels were 53.2 pC (grating) and 89.6 pC (fiber coil).
Conclusions:
- The proposed quasi-distributed system offers highly sensitive PD detection for submarine cable joints.
- The solid-wound coil configuration is optimal for enhanced acoustic signal detection.
- This technology provides a viable solution for effective online monitoring of critical submarine cable components.
