A Study on Optimization of Compact High-voltage Generator Based on Magnetic-core Tesla Transformer Young-Kyung Jeong*, Dong-Gi Youn** and Moon-Qee Lee†

Abstract – This paper presents a compact and portable high-voltage generator based on magneticcore
Tesla transformer for driving an UWB high power electromagnetic source. In order to optimize
the performance of the high-voltage generator, a novel open-loop cylindrical magnetic-core adopting
the quad-division lamination structure is proposed and manufactured. The designed high-voltage
generator using the proposed magnetic core has a battery-powered operation and compact size of 280
mm × 150 mm in length and diameter, respectively. The high-voltage generator can produce a voltage
pulse waveform with peak amplitude of 450 kV, a rise time of 1.5 ns, and pulse duration of 2.5 ns at
the 800 V input voltage.
† Corresponding Author: Dept. of Electrical and Computer Engineering,
University of Seoul, Korea. (mqlee@uos.ac.kr)
* Replex Co., Ltd., Korea and Dept. of Electrical and Computer
Engineering, University of Seoul, Korea. (ykj@replex.co.kr)
** Replex Co., Ltd., Korea. (admin@replex.co.kr)
Received: September 5, 2013; Accepted: January 9, 2014
 Full paper (PDF) 26-09-035_1349.pdf

Battery Charging System for PHEV and EV using Single Phase AC/DC PWM Buck Converter Jung-Hyo Lee*, Doo-Yong Jung*, Sang-HoonPark**, Taek-Kie Lee***, Young-Ryul Kim§ and Chung-Yuen Won

1. Introduction
There has been active research to develop environmentally friendly products due to the recent increase in the oil prices and the reinforcement of strict environmental regulations worldwide. In particular, in order to develop environmentally friendly vehicles, there is active research in the automotive industry, which utilizes an immense amount of oil resources, on the drive system using electric motors and power-conversion systems that may potentially replace the conventional internal combustion engine [1, 2]. PHEV(Plug-in Hybrid Electric Vehicle), NEV(Neighborhood Electric Vehicle) and the general EV(Electric Vehicle) are examples of the new ecological vehicles. Such vehicles use electricity as its auxiliary and main power source, and battery is used as the energy source to drive their electric motors.
 Journal of Electrical Engineering & Technology Vol. 7, No. 5, pp. 736~744, 2012
http://dx.doi.org/10.5370/JEET.2012.7.5.736
 Corresponding Author: Dept. of Electrical Engineering, Sungkyunkwan
Univerity, Korea. (woncy@skku.edu)
* Dept. of Electrical Engineering, Sungkyunkwan Univerity, Korea.
(daumin@naver.com)

LINK  https://www.mediafire.com/?6tsg166mmcmofcf

Electric Machines Por D. P. Kothari,I. J. Nagrath

Análise da Resposta Dielétrica com DIRANA

Métodos de resposta dielétrica permitem a análise direta da isolação sólida de transformadores. Eles também podem ser utilizados para avaliação de buchas e das propriedades da isolação de motores, geradores, e cabos com isolação de papel impregnado em óleo.

Multi-physics Analysis for Temperature Rise Prediction of Power Transformer

 

Multi-physics Analysis for Temperature Rise Prediction of Power Transformer Hyun-Mo Ahn*, Joong-Kyoung Kim**, Yeon-Ho Oh***, Ki-Dong Song***and Sung-Chin Hahn

Abstract – In this paper, a method for multi-physics analysis of the temperature-dependent properties of an oil-immersed transformer is discussed. To couple thermal fields with electromagnetic and fluid fields, an algorithm employing a user defined function (UDF) is proposed. Using electromagnetic analysis, electric power loss dependent on temperature rise is calculated; these are used as input data for multi-physics analysis in order to predict the temperature rise. A heat transfer coefficient is applied only at the outermost boundary between transformer and the atmosphere in order to reduce the analysis region. To verify the validity of the proposed method, the predicted temperature rises in high-voltage (HV) and low-voltage (LV) windings and radiators were compared with the experimental values.
† Corresponding Author: Dept. of Electrical Engineering, Dong-A University, Korea .(schahn@dau.ac.kr)
* Dept. of Electrical Engineering, Dong-A University, Korea. (hmahn @donga.ac.kr)
** R&D Center, Power & Industrial System Performance Group, HYOSUNG Corporation, Korea .(jkkim1976@hyosung.com)
*** Power Apparatus Research Center, HVDC Research Division, Korea Electrotechnology Research Institute, Korea. (yhoh@keri. re.kr)
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http://www.koreascience.or.kr/search/articlepdf_ocean.jsp?url=http://ocean.kisti.re.kr/downfile/volume/kiee/E1EEFQ/2014/v9n1/E1EEFQ_2014_v9n1_114.pdf