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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Transactions of the Korean Institute of Electrical Engineers P
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Journal DOI :
The Korean Institute of Electrical Engineers
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Volume & Issues
Volume 58, Issue 4 - Dec 2009
Volume 58, Issue 3 - Sep 2009
Volume 58, Issue 2 - Jun 2009
Volume 58, Issue 1 - Mar 2009
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Characteristics Analysis of Capacitor and Reactor for Harmonic Filter
Kim, Jong-Gyeum ; Park, Young-Jeen ; Lee, Eun-Woong ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 58, issue 1, 2009, Pages 1~8
Recently, application of non-linear load is gradually increased. Non-linear load produces harmonic components of current during the energy conversion transition. Passive filter is used for reducing of harmonics in the user power systems. This filter, which is composed of capacitor and reactor, frequently get out of order by electrical stress. There are voltage and current increase when capacitor and reactor are applied in the user's filter systems. If increased voltage and current is above stipulated values, they have severely an influences on the life of capacitor and reactor. This paper describes that the voltage and current of capacitor used for filter is within the limits of allowable values, but reactor is beyond the limits and reveals spike voltage. Therefore this phenomenon brings about premature fault of reactor and capacitor.
PSCAD/EMTDC Model of PEMFC for Power System Analysis
Lee, Jong-Su ; Kim, Hak-Man ; Lee, Byoung-Kuk ; Shin, Myong-Chul ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 58, issue 1, 2009, Pages 9~14
The modelling of PEMFC(Proton Exchange Membrane Fuel Cell) has been studied in many kinds of methods. But there are some limitations in application of the developed models to analyze transient phenomena of power systems. The PSCAD/EMTDC is very popular simulation tool in power system areas. To analyze power systems interconnected to PEMFCs, the PSCAD/EMTDC model of the PEMFCs is needed. In this paper, we developed a PSCAD/EMTDC model of PEMFC based on electro-chemical characteristic equations of PEMFC. Also, we performed simulations using the developed model in the PSCAD/EMTDC program and tested appropriateness of the proposed models. The simulations showed good results.
Path Planning of Mobile Robot using Weighted Potential Function with Obstacle Avoidance
Kim, Jin-Hwan ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 58, issue 1, 2009, Pages 15~19
This paper presents the potential field for mobile robot path planning. The proposed repulsive potential has weighted parts, which consists of conventional repulsive potential and goals nonreachable with obstacles nearby repulsive potential. It ensures the global minimum of the total potential when the robot approaches goals near obstacle and the robot passes the adjacent obstacles. Simulation results shows that the proposed potential is better than conventional potentials.
Development of the Switching Mode Conversion Type Pulse Charger for the Lead Battery of Solar Cell Generator Equipment by Fly-Back Converter Method
Shin, Choon-Shik ; An, Young-Joo ; Kim, Dong-Wan ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 58, issue 1, 2009, Pages 20~26
In this paper, the switching mode conversion type pulse charger by fly-back converter method for lead battery of the solar cell generator equipment is proposed. And we propose the control circuit and design method of insulated switching mode convert type pulse charger by fly-back convert method in the lead battery. The proposed system can minimize the current consumption by digital pulse. Also the proposed system can generate the constant 10[KHz] frequency, transmit the signal with main control system in the power control system. And it supervises the state of lead battery using one chip micro processor. The proposed the switching mode conversion type pulse charger by the fly-back converter method can charge fast and stabilize lead battery with nominal value 12[V], 20[AH]. Also we propose the design procedure of the power control circuit for turn ratio of fly-back inductor and determining method of values such as the charging current, bulk current, partial current, over current value and fixed charging voltage. The experiment results for the voltage and current wave for partial, bulk, over and fixed charging period show the good charging effect and performance. And the PCB and internal coupling diagram of the switching mode conversion type pulse charger by fly-back converter method is presented.
Evaluation of Structural Importance Based on Minimal Cut Set Theory
Kim, Dong-Jin ; Kim, Hyung-Chul ; Kim, Jin-O ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 58, issue 1, 2009, Pages 27~32
A technical system generally comprise a number of subsystems and components that are interconnected in such a way that the system is able to perform a set of required function. Because of the complex system structure with serial, parallel and bridged connections, some certain subsystems or components are more critical than the others. The main concern of a reliability engineer is to identify potential failures and to prevent these failures from occurring. In order to prevent fatal failures, proper inspections and maintenance actions for each component are required Considering above objectives of reliability engineers and characteristics of a practical system, several practical method for evaluating system and component reliabilities have developed namely Birnbaum's and Fussell & Vesely's measures. However there are several critical weaknesses in traditional calculation process as the target system gets larger. In this paper, a new technique for calculating component's structural importance is proposed and compared to Birnbaum's with representative system examples (serial, parallel. k out of n, and bridge type).
A Small Ultra-Wideband (UWB) Antenna with Combination of Electric-Magnetic Radiators
Kim, Yong-Jin ; Jung, Chang-Won ; Kim, Young-Bong ; Kwon, Do-Hoon ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 58, issue 1, 2009, Pages 33~37
In this paper, a printed small Ultra-Wideband (UWB) antenna with directive radiation characteristics based on combination of electric-magnetic radiators is presented. The combinations of the electric and magnetic type antennas result in the directive radiation patterns for all observed UWB frequency band. Simple combination of dipole antenna and loop antenna is also presented to show that proper configuration of electric radiator and magnetic radiator can produces directive radiation characteristics. The target frequency is from 3.1 GHz to 10.6 GHz with size of
. A proto-type of the combined antenna is simulated, fabricated and measured. Simulation and experimental results of input impedance and gain characteristics of the proposed antenna are presented. There are good agreements between the simulated and measured VSWR curves. Also, the results show the directive radiation characteristics with small antenna form factor over the target frequency range.
Performance Analysis for Passive Filter Considering Allowable Limits of Tolerance
Kim, Jong-Gyeum ; Kim, Il-Jung ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 58, issue 1, 2009, Pages 38~43
Reactors are connected with capacitors to passive filter circuits for reducing harmonics caused by power conversion application. This passive filter frequently gets out of order by voltage and current stress. Especially filter reactor has too much voltage harmonics components, its trouble rate is higher than capacitor. In this paper, we analyzed voltage and current of reactor and capacitor used for passive filter by simulation and measurement. If reactor has a tolerance on variation of reactance value, series resonance frequency is different from originally filter design frequency and parallel resonance can be generated at the close point of the former. Because filter absorbs harmonic component of non-linear load, much of harmonic voltage has been impacted on reactor.
Ionization and Attachment Coefficients in Mixtures of
Kim, Sang-Nam ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 58, issue 1, 2009, Pages 44~47
This paper describes the information for quantitative simulation of weakly ionized plasma. We must grasp the meaning of the plasma state condition to utilize engineering application and to understand materials of plasma state.
gas is widely used in industrial of insulation field. In this paper,
is mixed to improve pure
gas characteristics. Electron transport coefficients in
mixture gases are simulated in range of E/N values from 70 to 400 [Td] at 300K and 1 Torr by using Boltzmann equation method. The results of this method. which are ionization coefficient, attachment coefficient, effective ionization coefficient, and critical E/N, can be important data to present characteristic of gas for insulation. Specially critical E/N is a data to evaluate insulation strength of a gas and is presented in this paper for various mixture ratios of
Amber Information Design to Keep Safety-Driving Under Road Structure at Local-Scale Geographic
Park, Jung-Chan ; Hong, Gyu- Jang ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 58, issue 1, 2009, Pages 48~55
In order to keep safe driving conditions under road networks, there are several formations such as road structure, road surface condition, traffic occupancy and supplement of an accurate information of traffic status ahead To support safe-driving on each road formation, each formation is supplied with various information to help the driver. However, in some cases like rapid status change at local-scale geography, traffic information systems often displays insufficient information because of the lack of information correlation. In order to accurately aware the driver, all road formation must be in sync. It is important to supply accurate information to the driver because this information directly impacts the drivers on the road. This paper discusses the amber information to keep the least safety driving over road formations including tunnels and bridges. This paper also will propose the informations for safe-driving conditions, information linkage on the road and rule-base safety information, as ITS technology, being displayed for all drivers under the worst weather conditions.
Development of the Telemetering Control System for the HDTV SMPS Aging System
Kim, Byoung-Wook ; Lim, Seung-Kwan ; Ko, Dae-Sung ; Roh, Shin-Rea ; Kim, Yeong-Min ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 58, issue 1, 2009, Pages 56~61
In this paper, A telemetering control system for the HDTV SMPS Aging System is developed. Manual Aging System is usually used to measurement of a produced SMPS. But in this system, the respective operator is arranged and monitoring the test cycle visually- According to an excess of the test time and mistakes of an operator, the reliability makes come to be low. Therefore as using the telemetering control system, it improves a productivity and a reliability of the HDTV SMPS. In the developed system, elec1rical signal is measured from aging system, and converted into the digital signal. Also the telemetering control system is composed of many units - telemetering control units for collecting the data, data relay units for the digital transmission service, data division for the multichannel realization.
Development of the Localized Electromotion Scooter Controller for the Senior and Disabled
Kim, Byoung-Wook ; Lim, Seung-Kwan ; Roh, Shin-Rea ; Lim, Byung-Hyun ; Kim, Yeong-Min ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 58, issue 1, 2009, Pages 62~66
In this paper, A localized electromotion scooter controller for the senior and disabled is developed. Recently, the population which uses the electromotion wheel chair or electromotion scooter is increasing. The reason is that the electromotion wheel chair and electromotion scooter were newly applied in medical treatment grant item. In the whole world, electromotion scooter controller is coming to be produced above a hundred of millions. The products produced are consuming from most Europe and North America. the demand is increasing rapidly in Korea. The electromotion scooter which is sold to domestic is about 40,000 units, and about 70% or more in the products are imported from the foreign nation. Also controller for electromotion scooter uses the foreign nation product. Consequently, as the localized electromotion scooter controller is developed, it will be able to expect an income substitution effect, and apply to the agriculture and leisure mobile equipment parts.
An Assemble and Expandable Substrate Heating Apparatus for the Semiconductor Manufacturing
Jung, Soon-Won ; Koo, Kyung-Wan ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 58, issue 1, 2009, Pages 67~71
This research is a new structure of the semiconductor substrate heating apparatus in which the assembly and expansion are possible. The fast thermo-responsive according to the direct heating structure of the heating plate layer adhering closely to the floor side of a substrate and the fast heat loss minimization can be accomplished. Moreover, the contact area of the sheath heater, which is the heating plate layer built-in heating apparatus, is increased, so that it has more heating valid area. There is no problem with the deformation interpreted in the state where it assembles the block of a several of the simulation result structure, the safety, and the stress. In addition, it is confirmed that building a large-size heating block is possible since the temperature deflection of the manufactured plate is lower than the standard value.
Secondary Current Range Extension of Current Transformers by Using Two Different Current Transformers and Absolute Evaluation Technique
Kim, Yoon-Hyoung ; Han, Sang-Gil ; Jung, Jae-Kap ; Han, Sang-Ok ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 58, issue 1, 2009, Pages 72~78
We have developed a current range extension method to obtain the ratio error and phase displacement of a current transformer (CT) by using absolute evaluation method and two different CTs. The method was applied to CTs under test with the current ratios in the range of 5,000 A / 1 A - 20,000 A / 1 A. The ratio error and phase displacement of the CT under test obtained in this study are consistent with those measured at the national institute in Germany using the same CT under test within an expanded uncertainty (k = 2) in the overall current ratios.
Comparison of Characteristics on the Flux-Lock and the Transformer Type SFCLs with Three Superconducting Units
Lee, Ju-Hyoung ; Choi, Hyo-Sang ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 58, issue 1, 2009, Pages 79~84
In order to increase the capacity of the superconducting fault current limiter(SFCL), the current and voltage grades of the SFCL must be increased. As a method for the increase of the current and voltage grades of the SFCL, we compared the various characteristics between the flux-lock type SFCL "With three superconducting units connected in series and the transformer type SFCL using the transformer with three secondary circuits. One of three superconducting units had not quenched in the flux-lock type SFCL. Therefore, the unbalanced power burden happened because of the voltage difference generated by unbalanced quenching between the superconducting units. In the meantime, the three superconducting units were all quenched in the transformer type SFCL using the transformer, and the voltage difference generated between the superconducting units was decreased. Therefore, the difference of critical characteristics was complemented by distribution of fault current in accordance with the turn's ratio between primary and secondary windings. The unbalanced power burden of the superconducting units was reduced due to flux-share between the superconducting units in the transformer. In conclusion, the capacity increment of the SFCL using a transformer was easier due to equal distribution of voltages generated by simultaneous quench of the superconducting units. We think that the characteristics is improved more because of the decrease of saturation in the iron core if the secondary winding is increased in the SFCL using the transformer.
Characteristics of Matrix Type SFCL with
Array According to the Trigger Coil and Shunt Resistance
Jung, Byung-Ik ; Choi, Hyo-Sang ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 58, issue 1, 2009, Pages 85~89
We investigated the quench characteristics in accordance with increase of turns number of trigger coil and shunt resistance of matrix-type superconducting fault current limiter (SFCL) with
array. The matrix-type SFCL consists of the trigger part to apply magnetic field and the current-limiting part to limit fault current. The fault current limiting characteristics according to the increase of magnetic field and applied voltage were nearly same. This is because the application of magnetic field hasn't an affect on total impedance of the SFCL. When turns number of a reactor increased, the voltage difference between two superconducting units in the current-limiting part according was decreased. The resistance difference generated in two superconducting units was also decreased. Therefore, we confirmed that the differences of the critical behaviors between superconducting units were reduced by application of magnetic field. By this results, we could decide the optimum turns number of reactor to apply magnetic field.
The Development of Flood Protection System for Pad Transformer using Pneumatic Pressure
Kim, Gi-Hyun ; Lee, Sang-Ick ; Bae, Seok-Myung ; Jung, Chan-Oong ; Lee, Jae-Yong ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 58, issue 1, 2009, Pages 90~94
The inundation of substation and ground power equipment breaks out every summer season in low-lying downtown and low-lying shore by localized heavy rain, typhoon and tidal wave. For diminishing flood damage of electrical equipment in the root, flood protection system which is used the basic frame of Pad transformer is developed using pneumatic pressure. This system is established on pressure generator equipment and sensor of flooded level operates at flooding occurrence and is maintained a shutting tightly structure. The system is able to protect indraft water in Pad Transformer and supply the electricity at emergency(flooding). And we tested safety for insulation resistance at flooding and applying an electrical current. We estimate that loss cost which is caused by with flooding and the power failure will be diminished if it is addition to advances the reliability evaluation by setting an example.