Abstract
Subsea observation networks have gradually become the main means of deep-sea exploration. The reliability of the observation network is greatly affected by the severe undersea conditions. This study mainly focuses on theoretical research and the experimental platform verification of high-impedance and open-circuit fault detection for an underwater observation network. With the aid of deep learning, we perform the fault detection and prediction of the network operation. For the high-impedance and open-circuit fault detection of submarine cables, the entire system is modeled and simulated, and the voltage and current values of the operating nodes under different fault types are collected. Numerous calibrated data samples are supervised by a deep learning algorithm, and a fault location system model is built in the laboratory to verify the feasibility and superiority of the scheme. This paper also studies the fault isolation of the observation network, focusing on the communication protocol and the design of the fault isolation system. Experimental results verify the effectiveness of the proposed algorithm for the location and prediction of high-impedance and open-circuit faults, and the feasibility of the fault isolation system has also been verified. Moreover, the proposed methods greatly improve the reliability of undersea observation network systems.
Highlights
Cabled submarine observation networks are underwater monitoring networks formed by connecting many monitoring terminals/equipment distributed in the ocean through photoelectric composite cables
Subsea observation networks, which are composed of many underwater photoelectric composite cables, electrical connectors, connecting equipment, and observation terminals, operate in deep sea and other harsh environments
Given their complex structure and poor working environment, power transmission systems are prone to failure, which affects the stability of power transmission
Summary
Cabled submarine observation networks are underwater monitoring networks formed by connecting many monitoring terminals/equipment distributed in the ocean through photoelectric composite cables These networks are connected to the land transmission network grid and the communication network to realize the excellent span of land monitoring systems extending to the deep sea [1,2,3,4]. Subsea observation networks, which are composed of many underwater photoelectric composite cables, electrical connectors, connecting equipment, and observation terminals, operate in deep sea and other harsh environments. Given their complex structure and poor working environment, power transmission systems are prone to failure, which affects the stability of power transmission. In the case of ground faults of submarine cables, most of the current transmitted by shore stations flows through a short-circuit point, because the network transmits electric energy through a single line; the constant voltage power supply becomes paralyzed and stops immediately because the current exceeds the threshold value, and all the corresponding underwater connection boxes cannot be started normally; these conditions should be avoided as much as possible [6,7]
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