Design and Application of a Junction Box for Cabled Ocean Observatories

2012 ◽  
Vol 46 (3) ◽  
pp. 50-63 ◽  
Author(s):  
Yanhu Chen ◽  
Canjun Yang ◽  
Dejun Li ◽  
Bo Jin ◽  
Ying Chen
Keyword(s):  
Power Distribution ◽  
Distribution System ◽  
Heat Dissipation ◽  
High Reliability ◽  
Monterey Bay ◽  
Power Distribution System ◽  
Sea Trial ◽  
Ground Fault ◽  
Self Protection

AbstractCabled ocean observatories enabling large amounts of power and two-way communication bandwidth for underwater experiments are a future approach for studying the oceans. On April 21, 2011, at Monterey Bay, California, USA, a network node composed of a junction box (JBox) and three scientific instruments was deployed at the Monterey Accelerated Research System (MARS) site for a 6-month uninterrupted sea trial. The JBox is a facility that can provide multiple wet-mateable connections for various instruments. Each connection can draw 500 W of power and has 10/100 Mbit/s network communication. The current study presents the design and construction of the JBox with focus on the following aspects: a power distribution system with high reliability; a flexible springloaded mechanical structure for heat dissipation; communication that incorporates various data protocols; and self-protection against faults like over-current, short fault, ground fault, and flooding. The deployment and operation of the JBox is described. The sea trial results show that the technologies and methods applied on the JBox and the deploying approach are applicable and worthy of consideration for long-term cabled ocean observatories.

scholarly journals Non-isolated load sharing direct current system operation with use of the auctioneering diodes

2019 ◽  
Vol 28 ◽  
pp. 01037 ◽  
Author(s):  
Maciej Kozak
Keyword(s):  
Power Distribution ◽  
Distribution System ◽  
Heat Dissipation ◽  
Current System ◽  
Electrical Power ◽  
Experimental System ◽  
Laboratory System ◽  
Simulation Studies ◽  
Power Distribution System ◽  
Electrical Systems

The paper presents the background and results of numerical simulation and experimental research of a system using auctioneering diodes used to distribute the electrical power between two power converters connected with intermediate circuits in parallel, direct connection. Presented non-isolated power distribution system which utilizes blocking diodes placed in DC branches are used in the selected ship's electrical systems, however, they create problems related to control and handling ground faults. Another issue occurring during the operation of this type of systems is increased heat dissipation while diodes switching. Selected problems related to the operation of experimental system have been identified by means of simulation studies and experiments carried out in a 11 kVA laboratory system and the theoretical basis along with results are provided in the article.

Recognition of the Single-Phase Ground Fault in Power Distribution System

2011 ◽  
Vol 480-481 ◽  
pp. 1581-1586
Author(s):  
Jun Zhang
Keyword(s):  
Power Distribution ◽  
Distribution System ◽  
Distribution Systems ◽  
Single Phase ◽  
Transient State ◽  
Power Distribution Systems ◽  
Power Distribution System ◽  
Ground Fault ◽  
Analysis Computer ◽  
Novel Method

For power distribution systems, recognizing the single-phase ground fault is very difficult because there are several faults with similar features. This paper presents a novel method that can help to overcome this difficulty. The idea is to turns the original fault info into a whole system with transient state, steady state and transition state. Theoretical analysis, computer simulation and lab experiments verified the effectiveness of the proposed method.

Design and Realization of High Reliability and Extensible Automatic Power Distribution System for General Aviation Aircraft

2013 ◽  
Vol 677 ◽  
pp. 466-471
Author(s):  
Qin Ling Zhang ◽  
Lei Liu ◽  
Yang Liu
Keyword(s):  
Power Distribution ◽  
Distribution System ◽  
Fault Tolerant ◽  
High Reliability ◽  
General Aviation ◽  
Power Distribution System ◽  
Implementation Scheme ◽  
Composition Structure ◽  
Independent Distribution ◽  
General Aviation Aircraft

Taking small-sized plan as a representative of general aviation aircraft, a kind of airborne automatic power distribution system architecture based on DSP, FPGA and SSPC is proposed, which can meet the requirements of high reliability and expansibility in airborne platform. Based on the research of distribution function, composition structure and software and hardware design in airborne automatic power distribution system, this paper puts forward corresponding implementation scheme in view of independent distribution control and fault tolerant design, and develops a principle prototype. The experimental results verify that the designed system has achieved expected functional demand.

scholarly journals Analysis of SCADA Application on Distribution System Reliability

2020 ◽  
Vol 3 (2) ◽  
pp. 46-52
Author(s):  
Noveri Lysbetti Marpaung ◽  
Edy Ervianto ◽  
Rahyul Amri ◽  
Hayatul Illahi
Keyword(s):  
System Reliability ◽  
Power Distribution ◽  
Distribution System ◽  
High Reliability ◽  
Electrical Power ◽  
Electrical Energy ◽  
Power Distribution System ◽  
Reliability Level ◽  
Before And After ◽  
Distribution System Reliability

Reliability of Electrical Power Distribution to consumer is strongly influenced by its distribution system. Therefore, electrical power distribution system with high reliability is needed. In distribution of electrical power, reliability level of distribution system is very necessary, because it is influential strongly factor towards continuity of electrical energy distribution to consumers. Parameters can be used to determine reliability level of Electrical Power Distribution System are SAIDI, SAIFI, and CAIDI. SCADA on Electrical Power Ditribution System is needed because it can monitor, control, configure and record working system real time. Besides it, SCADA also can handle interruption temporary or permanently in short time by using remote. Aim of this research is to compare distribution system reliability indexes such as SAIFI, SAIDI and CAIDI before and after integrated with SCADA in Bukittinggi Rayon of PT PLN (Persero), Western Sumatera, Indonesia. This research uses Distribution System Data from 2015 and 2016. Result of this  rresearch is Realibility Indexes before Integrated with SCADA(2015) are 15.40 hours/customer, 46.36 interruption/year, 0.33 hour/year, while after Integrated with SCADA(2016) are 2.14 hours/customer, 22.41 interruption/year, 0.10 hour/year. for SAIDI, SAIFI CAIDI Indexes respectivel y. It can be concluded that The increase of Reliability Index after integrated with SCADA are 86.1% for SAIDI, 51.66% for SAIFI, 69.7% for CAIDI.

The Study of Ferromagnetic Resonance Overvoltage and its Suppression Methods in 35kv Power System

2013 ◽  
Vol 748 ◽  
pp. 449-452
Author(s):  
Wei Jin ◽  
Kuang Shi ◽  
Jun Hao Li
Keyword(s):  
Power System ◽  
Simulation Model ◽  
Ferromagnetic Resonance ◽  
Power Distribution ◽  
Distribution System ◽  
Single Phase ◽  
Power Distribution System ◽  
Nonlinear Resistor ◽  
Ground Fault ◽  
Small Resistance

Ferromagnetic resonance overvoltage is an internal overvoltage and it often occurred in the power distribution system which neutral point ungrounded. A 35kV power system is used as the prototype to establish the 35 kV substation's simulation model which is based on the ATP - EMTP and ferromagnetic resonance overvoltage is researched and analyzed In this paper. The ferromagnetic resonance overvoltage which is stimulated by single-phase ground fault is studied in this paper studied and ferromagnetic resonance suppression methods were also studied. The results show that the nonlinear resistor is connected in the PT primary neutral side and small resistance is connected in the PT open delta are effectively methods which can restrain ferromagnetic resonance overvoltage.

scholarly journals STUDI ANALISIS KOORDINASI OVER CURRENT RELAY (OCR) DAN GROUND FAULT RELAY (GFR) PADA RECLOSER DI SALURAN PENYULANG PENEBEL

2017 ◽  
Vol 16 (2) ◽  
pp. 37
Author(s):  
I Dewa Gde Agung Budhi Udiana ◽  
I G Dyana Arjana ◽  
Tjok Gede Indra Partha
Keyword(s):  
Power Distribution ◽  
Distribution System ◽  
Short Circuit ◽  
Protection System ◽  
Area Network ◽  
Power Distribution System ◽  
Time Value ◽  
Ground Fault ◽  
Distribution Transformers ◽  
Electric Power Distribution

Short circuit causing over current problem and can might causing interference of the equipment performance such as distribution transformers also causing widespread disruption occurred. In resolving such interference is required as protection system on the distribution system. Seeing all above is needed coordination between the supporting component of the protection system which is consisted of Over Current Relay (OCR) and Ground Fault Relay (GFR). The research was conducted at PT. PLN (Persero) South Bali Area Network, INDONESIA on recloser in the feeder line of Penebel. OCR setting between the Relay feeder of Penebel, Recloser Celagi, Recloser Bakisan, and Recloser Benana still less selective, with time value coordination between average security was still less than 0,2 second. Then OCR setting and GFR relay feeder of Penebel, Recloser Celagi, Recloser Bakisan, and Recloser Benana was recommended for re-setting in order to minimize disruption and electric power distribution system to be reliable.

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