Research on High-Impedance Fault Diagnosis and Location Method for Mesh Topology Constant Current Remote Power Supply System in Cabled Underwater Information Networks

Zheng Zhang,Tianshu Wu,Xichen Wang,Xuejun Zhou

doi:10.1109/access.2019.2926220

Zheng Zhang, Tianshu Wu + Show 2 more

Open Access

https://doi.org/10.1109/access.2019.2926220

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Abstract

Cabled underwater information networks (CUINs) have evolved over the last decade to provide abundant power and broad bandwidth communication to enable marine science. To ensure reliable operation of the CUINs, the technology for high-impedance fault diagnosis and isolation with high reliability and accuracy is essential. In this paper, we review diagnosis and location methods as applied to a constant voltage ring and the tree topology network. A high-impedance fault diagnosis method based on the variation of the sampling voltage in the primary nodes (PNs) for a constant current remote power supply system is proposed. The methods for analyzing the fault voltage with using power monitoring and control system (PMACS) and communications monitoring, control system (CMACS), and hybrid detection with alternating current and direct current are used for research the high-impedance fault location based on the designed fault isolation circuit. In particular, a verification scheme for high-impedance fault location is designed for the CUINs based on the classical mesh topology. Furthermore, high-impedance faults of nodes and submarine cable sections in the trunk cable are simulated, and the variations of leakage voltage are analyzed. By researching the change of leakage voltage before and after the fault occurs, the feasibility and practicability of the diagnosis and location scheme are verified.

Highlights

About 70% of the earth is covered by ocean
With the continuous development of cabled underwater information networks, detection, location, and isolation of faults in remote power supply systems have become an important part of system operation and maintenance
Aiming at the highimpedance fault in the constant current remote power supply system of Cabled underwater information networks (CUINs), this paper firstly proposes the method of observing, locating faults, and isolating fault intervals by analyzing the observation data in the shore station

Summary

INTRODUCTION

About 70% of the earth is covered by ocean. Exploring the operating mechanism of the deep ocean is the key to understanding the development of human civilization [1]–[3]. Lu S, Chan T et al proposed a method directed against the low/high impedance faults of the constant voltage remote power supply system in the NEPTUNE observation network [12], [23], by changing the polarity of the SPFE output voltage, the links for the power and communication in the branching unit (BU) are adjusted to control the interrupter switching to realize low-impedance fault location and isolation. ANALYSIS OF HIGH-IMPEDANCE FAULT LOCATION FOR CONSTANT CURRENT REMOTE POWER SUPPLY SYSTEM When a fault occurs in the branch cable, the load voltage of the PN changes significantly, even the overload protection of PN will cause no valid data upload and the measured voltage of the SN is zero. For different statuses of low-level high-impedance or open-circuit faults in the trunk cables, different situations can be analyzed

DIAGNOSIS AND LOCATION ANALYSIS OF LOW-LEVEL HIGH-IMPEDANCE FAULT

DIAGNOSIS AND LOCATION ANALYSIS OF AN OPEN-CIRCUIT FAULT

CONCLUSION