Study on 10 kVDC powered junction box for a cabled ocean observatory system

Chen, Yanhu; Yang, Canjun; Li, Dejun; Jin, Bo; Chen, Ying

doi:10.1007/s13344-013-0023-y

Cited by 27 publications

(12 citation statements)

References 10 publications

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“…High-voltage energy is gradually distributed to each terminal instrument through the PJB and SJB. The second and terminal layers have their own energy and communication management systems, which can isolate and work independently under various operation failures [ 1 , 4 ].…”

Section: Overview Of the Subsea Observation Networkmentioning

confidence: 99%

“…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 ]. The reliable, safe, and stable power transmission of submarine observation networks is the key to ensuring that all underwater observation equipment can carry out scientific research and exploration work normally [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

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Fault Detection and Isolation Methods in Subsea Observation Networks

Xiao

Yao

Chen

et al. 2020

Sensors

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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.

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Section: Overview Of the Subsea Observation Networkmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fault Detection and Isolation Methods in Subsea Observation Networks

Xiao

Yao

Chen

et al. 2020

Sensors

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show abstract

“…At present, the mainstream international submarine cabled power supply technology uses direct current power supply, and there are two types, i.e., the constant voltage system and the constant current system, each system having its own advantages and disadvantages. For constant voltage power supply systems, the power converter module is connected in parallel with the trunk cable, and the power can be easily distributed through a mesh network [12], as with the North East Pacific Time-Integrated Undersea Networked Experiments (NEPTUNE-Canada) [13,14] and other operating systems [15,16]. For constant current power supply systems, a high-frequency switching converter is needed to shunt the primary node current on the trunk cable, keep the current in the trunk cable constant, and provide a constant current for the secondary node [11,17], as with Japan 's Dense Ocean Network for Earthquakes and Tsunamis (DONET) [18,19].…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of an Equivalent Load Power-Stability Control Circuit for Cabled Underwater Information Networks

2020

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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 stability of the remote power supply system, a key component of underwater power facilities, is essential. To avoid instability and collapse of the power system caused by rapid changes in load, we propose an equivalent load power-stability control circuit suited for an underwater constant current power supply system. This circuit can change its own working state according to the size of the load and play a role in power compensation. In order to prove the feasibility of the converter design, the working state of the circuit under different load values was analyzed and the performance of circuit was verified through simulation and experiments. The results show that when the load resistance changes within a large range (including when the load has an open circuit or short circuit fault), the equivalent load is basically unchanged or changed within a very small range for the constant current source, causing the constant current source to maintain stable output voltage and output power. Thus, the influence of the branch line cable on the trunk line cable is reduced, and the reliability of the underwater constant current power supply system is improved. Furthermore, the equivalent load power-stability control circuit would facilitate live equipment replacement and maintenance for CUINs. INDEX TERMS Cabled underwater information networks (CUINs), remote constant current power supply system, stability, equivalent load power-stability control.

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“…Currently, there are two major types of power supply systems used internationally and both are direct current (DC). In the first type, the trunk cable operates at a nominally constant voltage (CV) [15] and all nodes are parallel connected using seawater as a return; some examples of these systems are the North East Pacific Time-Integrated Undersea Networked Experiments (NEPTUNE-Canada) [16], [17] and other operating systems [18], [19]. In the second type, the trunk cable operates in a constant current (CC) mode [14].…”

Section: Introductionmentioning

confidence: 99%

A Novel Diagnosis and Location Method of Short-Circuit Grounding High-Impedance Fault for a Mesh Topology Constant Current Remote Power Supply System in Cabled Underwater Information Networks

et al. 2019

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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 CUINs, it is essential to have the technology for high-impedance fault diagnosis and isolation with high reliability and accuracy. The short-circuit grounding high-impedance fault status of mesh topology constant current remote supply system was diagnosed by analyzing the variation difference of equivalent current in the Laplace transform domain. Shore power feeding equipment (SPFE) supplied the power for underwater system individually from both terminals, and the fault location was located by calculating the shunt loss of the current in the trunk before and after the fault. Thus, the fault was isolated to maintain normal operation of the rest of the system and improve the reliability of CUINs. According to the established typical mesh topology constant current remote supply system circuit model, the fault location scheme was designed to simulate the faults of the cable sections in the different links in the constant current remote supply system, and the changes of current located at the primary nodes (PNs) in the Laplace transform domain before and after the fault were analyzed. The results show that the equivalent current of each PN changes when a fault occurs in the system, and the location of the fault point can be analyzed by comparing the shunt loss of the current in the trunk before and after the fault. The designed method of short-circuit grounding high-impedance fault diagnosis and location for a constant current remote supply system is suitable for the fault monitoring and judgment of CUINs with high feasibility and practicality. Furthermore, it provides technical support for the resulting effective determination of faults, isolation of faults, protection of equipment, and improvement of the system reliability.INDEX TERMS Cabled underwater information networks (CUINs), constant current, short-circuit grounding high-impedance fault, fault diagnosis, point location, reliability.

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Study on 10 kVDC powered junction box for a cabled ocean observatory system

Cited by 27 publications

References 10 publications

Fault Detection and Isolation Methods in Subsea Observation Networks

Fault Detection and Isolation Methods in Subsea Observation Networks

Design and Analysis of an Equivalent Load Power-Stability Control Circuit for Cabled Underwater Information Networks

A Novel Diagnosis and Location Method of Short-Circuit Grounding High-Impedance Fault for a Mesh Topology Constant Current Remote Power Supply System in Cabled Underwater Information Networks

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