A Study on the Surge Protection of Shipboard Electrical and Electronic Devices Electrical and Electronic Engineering,BY SUNG-JU PARK Korea Maritime University,

A Study on the Surge Protection of Shipboard Electrical and Electronic Devices

ABSTRACT

The surge on the shipboard is generated by an insulation breakdown, a short circuit and a switch operation, and is propagated via power, signal and communication, control cables and hull. The surge may lead to serious damage to electrical and electronic devices on shipboard. With this background, this thesis analyzed the power system of ships and carried out an experimental study on the surge protective method and device. Parallel type surge protective devices(SPD) with the 220[V] and the 440[V] rated voltage, and a series type SPD with the 220[V] rated voltage for electrical sensitive devices are designed and fabricated. A surge generator specified in IEC 61000-4-5 which can produce 8/20[us] current up to 15[kA] was fabricated to evaluate the proposed SPDs. The performance of the SPDs were evaluated by an un-powered test which applies the 8/20[us] surge current up to 10[kA] and by a powered test which superimpose a surge on the 220[V] and 60[Hz]. The maximum residual voltage of the parallel type SPD for the un-powered and the powered test were 1290[V] and 891[V], and of the series type SPD were 875[V] and 656[V], respectively. The experimental results showed that the series type SPD is more effective to protect electrical sensitive devices such as signal and communication devices since the series type SPD suppresses surge lower residual voltage than the parallel one. Also, insulation voltage of the shipboard electrical and electronic devices were compared to the residual voltage of the SPDs. The residual voltages of the SPDs were lower than the demanded insulation voltage level for the mains of the 220[V] and the 440[V]. Therefore, it was confirmed that the proposed SPDs have a sufficient performance to protect the shipboard electrical and electronic devices from surge voltages.

Gonzalo Villarán - UTEC Ventures- Universidad de Ingeniería y Tecnología (UTEC).-LIMA-PERU

 Gonzalo Villarán gvillaran@utec.edu.pe , Director de UTEC Ventures, nos presenta la aceleradora de start-ups (nuevas empresas de base tecnológica) de la Universidad de Ingeniería y Tecnología (UTEC). La presentación la organizó el Comité de Innovación Tecnológica Industrial (CINTECIN) en el Ministerio de la Producción (PRODUCE). Lima, 19 de agosto de 2014.
LINK1
http://cienciatecnologiainnovacion.blogspot.com.br/
LINK2
http://utecventures.com/

Realizzazione di un generatore di impulsi per la caratterizzazione di dispositivi di potenza DIPARTIMENTO DI INGEGNERIA “ENZO FERRARI” CORSO DI LAUREA MAGISTRALE IN INGEGNERIA ELETTRONICA

UNIVERSITA’ DI MODENA E REGGIO EMILIA
DIPARTIMENTO DI INGEGNERIA “ENZO FERRARI”
CORSO DI LAUREA MAGISTRALE IN INGEGNERIA ELETTRONICA
Realizzazione di un generatore di impulsi per la caratterizzazione di
dispositivi di potenza

Tipo di tesi	Tesi di laurea magistrale
Autore	BALA, RISUEL

Abstract
Realization of a printed circuit pulse generator very fast for the characterization of high-power devices using double pulse measurement, from which to derive information about the device tested as diverse as its thermal activity, problems with charge trapping and overall performance of the device. Perform the measurements on the device by the pulser achieved with the use of labview software, with which to synchronize the instruments used and the final automated data collection for its characterization

Introduzione: L’obiettivo di questa tesi è la realizzazione di un generatore di impulsi con il quale eseguire la caratterizzazione di dispositivi ad elevata potenza, mediante un particolare metodo di misura denominato “double pulse measurement”. Per la misura sarà realizzata un interfaccia mediante l’utilizzo del software Labview, con la quale eseguire in modo completamente automatizzato la caratterizzazione del dispositivo semplicemente impostando i parametri di interesse. Vediamo in maggior dettaglio come sarà articolata la tesi.
LINK ORIGINAL
https://morethesis.unimore.it/theses/available/etd-03242014-113750/unrestricted/TESI_DI_LAUREA_MAGISTRALE.pdf

Design of High-Current Inverter-type Rectifier for Electrolytic disinfection of Seawater Won Woo Cho Department of Electrical Engineering, The Graduate School, Pukyong NatIonal University

Design of High-Current Inverter-type Rectifier for Electrolytic disinfection of Seawater
Won Woo Cho
 Department of Electrical Engineering, The Graduate School, Pukyong NatIonal University
 Abstract

As the import and export cargos across the world increase with global trade environments, the ecocide caused by a lot of small marine organisms in the ship's ballast water is a big issue. To reduce the problem of ecocide, the BWTS (Ballast water treatment system) should be installed in ship. The implementation of the BWTS thus needs low-voltage high-current rectifier for electrolytic disinfection. So this paper proposes a suitable high-current inverter-type rectifier for electrolytic disinfection of seawater and analyzes its output characteristics. It also suggests the practical design guidelines for the proposed rectifier in terms of power circuit and controller designs.

Consideration on The Improvement of Input Currents for Variable Frequency Drive by Reactors Author Kim Hee Moon Department of Ocean Systems Engineering Graduate School of Korea Maritime University

Consideration on The Improvement of Input Currents for Variable Frequency Drive by Reactors
Author  Kim Hee Moon
Department of Ocean Systems Engineering Graduate School of Korea Maritime University
Abstract
AC line reactors and dc link reactors are widely used in variable frequency drives(VFDs) to improve the drive performance such as reducing input current harmonics,elevating input power factor,and protecting the drives from surges,etc.The effectiveness of both types of reactors in reducing input harmonics is affected by the loading of the drives and the system source impedance.In this paper,a simulation is performed to investigate of such factors.The rules to evaluate the needs and effectiveness using ac line or dc link reactors are proposed for practical applications