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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 59, Issue 4 - Dec 2010
Volume 59, Issue 3 - Sep 2010
Volume 59, Issue 2 - Jun 2010
Volume 59, Issue 1 - Mar 2010
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Sensorless Algorithm of Brushless DC Motors Using Terminal Voltage of the One Phase
Yoon, Yong-Ho ; Won, Chung-Yuen ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 2, 2010, Pages 135~140
This paper presents a sensorless speed control of BLDC Motor using terminal voltage of the one phase. Rotor position information is extracted by indirectly sensing the back EMF from only one of the three terminal voltages for a three-phase BLDC motor. Depending on the terminal voltage sensing rotor position, active filter is used for position information. This leads to a significant reduction in the component device of the sensorless circuit. Therefore this is a advantage for the cost saving and size reduction. With indirect sensing methods based on detection of the terminal voltage that require active filtering, the position information needs the six divider section by PLL circuit, the binary counter and johnson counter by the EPLD. Finally, this algorithm can estimate the rotor position information similar to Hall-sensor sticked the three-phase BLDC motor. As a result, the method described that it is not sensitive to filtering delays, allowing the motor to achieve a good performance over a wide speed range. In addition, a simple starting method and a speed estimation approach are also proposed. Experimental and simulation results are included to verify the proposed scheme.
Characteristic Analysis of Power Compensation Condenser Considering Voltage Harmonics
Kim, Jong-Gyeum ; Lee, Dong-Ju ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 2, 2010, Pages 141~145
Most of the industrial loads includes the non-linear load as well as the linear load because there are many kinds of power conversion equipments at the input stage of the load in distribution network. The non-linear load causes the distortion of voltage waveform at PCC because the non-linear load generates the harmonic current. As a result, various voltage harmonics are existed at PCC depending on the current harmonics from the non-linear load. And, a series reactor is generally connected to the power capacitor in series to attenuate the distortion of voltage waveform and to reduce an inrush current of power capacitor. Also, harmonic current of power capacitor is highly dependent on the series reactor because it is operated with the power capacitor as a passive filter against nonlinear loads. Then, these capacitors might be damaged by the excessive voltage and current harmonic components. In this paper, we presented how to select the capacitor and series reactor to meet the requirement of the voltage distortion at PCC and analyzed the voltage, current and capacity rating of the power capacitor by the computer simulation to ensure the safe operation of power capacitor when the voltage harmonics at PCC are existed. Also, the analysis data were compared with the experimental measurements for the verification.
Distribution Function and Drift Velocities in Mixtures of SF
Kim, Sang-Nam ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 2, 2010, Pages 146~150
Distribution Function and Drift velocities for electrons in
-Ar mixtures gases used by MCS-BEq algorithm has been analysed over the E/N range 30~300[Td] by a two term Boltzmann equation and by a Monte Carlo simulation using a set of electron cross sections determined by other authors, experimentally the electron swarm parameters for 0.2[%] and 0.5[%]
-Ar mixtures were measured by time-of-flight method. The results obtained in this work will provide valuable information on the fundamental behaviors of electrons in weakly ionized gases and the role of electron attachment in the choice of better gases and unitary gas dielectrics or electro negative components in dielectric gas mixtures. The results show that the deduced electron drift velocities agree reasonably well with theoretical for a rang of E/N values.
Spindle Motors using SMC for HDD
Kim, Sang-Uk ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 2, 2010, Pages 151~153
This paper is presented for the development of the brushless DC(BLDC) motor for the spindle motor of hard disk drives(HDD). A new BLDC Motor has the use of insulated, compacted, and iron powder for the armature core material of BLDC motors. Insulated iron powder in this paper is generally called soft magnet composite(SMC). The SMC is used for the stator of the motor instead of the laminated steel core. The motor used by SMC can have the good advantages in condition of the high frequency input power and small sized motor. It gets much more high efficiency than laminated steel core at same input power. The proposed motor has a technique of speed sensorless control. Experimental results show the performance of the proposed BLDC motors for an HDD.
Reliability Evaluation of Power Distribution System Considering Maintenance Effects
Moon, Jong-Fil ; Shon, Jin-Geun ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 2, 2010, Pages 154~157
In this paper, the Time-varying Failure Rates(TFR) of power distribution system components are extracted from the recorded failure data of KEPCO(Korea Electric Power Corporation) and the reliability of power distribution system is evaluated using Mean Failure Rate(MFR) and TFR. The TFR is approximated to bathtub curve using the exponential and Weibull distribution function. In addition, Kaplan-Meier estimation is applied to TFR extraction because of incomplete failure data of KEPCO. Also the reliability of the real power distribution system of Korea is evaluated using the MFR and TFR extracted from real failure data, respectively and the results of each case are compared with each other. As a result, it is proved that the reliability evaluation using the TFR is more realistic than MFR. In addition, it is presented that the application method at power distribution system maintenance and repair using the result of TFR.
Development of High Reliability Monitoring and Control System for Platform Screen Door
Kim, Jin-Sik ; Shon, Jin-Geun ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 2, 2010, Pages 158~162
PSD is automatically opened and closed when subway train arrive on the station. This system was designed to control electric automatic system. These doors will provide passenger safety, energy saving and a good environment in subway. The monitoring and control systems of PSD are configured so that they can be operated in automatic mode in connection with ATO through the composite control panel in the station control room. The objective of this paper is to obtain high reliability that is essential for monitoring and control systems of PSD. The power supply is based on protection circuit using DC power bridge from two UPS. Also, stable communication system consists of CAN communication line redundancy and RF cross protection algorithm. Monitoring state display results show the validity of the proposed high reliability monitoring and control systems of PSD.
A Study on the Intelligent Position Control System Using Sliding Mode and Friction Observer
Han, Seong-Ik ; Lee, Yong-Jin ; Lee, Kwon-Soon ; Nam, Hyun-Do ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 2, 2010, Pages 163~172
A robust positioning control system has been studied using a friction parameter observer and a recurrent fuzzy neural network based on the sliding model. To estimate a nonlinear friction parameters of the LuGre friction model, a dual friction model-based observer is introduced. In addition, an approximating method for a system uncertainty has been developed using a recurrent fuzzy neural network technique to improve positioning performance. Experimental results have been presented to validate the performance of a proposed intelligent compensation scheme.
Advanced Frequency Estimation Technique using Gain Compensation
Park, Chul-Won ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 2, 2010, Pages 173~178
Frequency is an important operating parameter of a power system. Due to the sudden change in generation and loads or faults in power system, the frequency is supposed to deviate from its nominal value. It is essential that the frequency of a power system be maintained very close to its nominal frequency. And monitoring and an accurate estimation of the power frequency by timing synchronized signal provided by FDR is essential to optimum operation and prevention for wide area blackout. As most conventional frequency estimation schemes are based on DFT filter, it has been pointed out that the gain error by change in magnitude could cause the defects when the power frequency is deviated from nominal value. In this paper, an advanced frequency estimation scheme using gain compensation for fault disturbance recorders (FDR) is presented. The proposed scheme can reduce the gain error caused when the power frequency is deviated from nominal value. Various simulation using both the data from EMTP package and user's defined arbitrary signals are performed to demonstrate the effectiveness of the proposed scheme. The simulation results show that the proposed scheme can provide better accuracy and higher robustness to harmonics and noise under both steady state tests and dynamic conditions.
The Development and the Performance Test of Bay Controller for the High-Voltage Gas Insulated Switchgear
Woo, Chun-Hee ; Lee, Bo-In ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 2, 2010, Pages 179~184
The digital substation automation system has contributed hugely to increasing the stability of power systems by providing not only protection and control of power systems but diagnostic features alongside them. Digital substation automation systems in the scale of substations consist of integrated operation systems and intelligent electronic devices. The main intelligent electronic devices currently in use are digital protection relays and the bay controllers in Gas insulated switchgears. Proficiently accomplishing the coordination of protection within the power system as a means of ensuring reliability and contriving for the stability of power supply through connection of function, the application of bay controllers is crucial, which collectively manage the protection relay at the bay level in order to achieve both. In this research, the bay controllers to be used in high-voltage Gas insulated switchgear has been localized, and in particular, the logic function and editor required in order to minimize the complicated hardware-like cable connections in the local panel have been developed. In addition, to ensure the strength and reliability of the bay controller hardware developed herein, the type tests from KERI have been successfully completed.
The Estimation on Switching Technique via Output Power Source Analysis of Power Conversion System in an Electric Railway Vehicle
Kim, Jae-Moon ; Lee, Eul-Jae ; Yun, Cha-Jung ; Kim, Yang-Su ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 2, 2010, Pages 185~190
This paper presents the estimation on switching technique via output power source analysis of power conversion unit in electric railway vehicle. The focus of this study suggested an alternative on critical problems by using head electric power(HEP). To achieve this, we have measured output power of HEP, and measurement devices set up at output of transformer connected HEP to analysis quality on output power source of head electric power(HEP) unit in electric railway vehicle. Using results of measurement of it, parameters are assumed for simulation to confirm estimation on switching technique. It is confirmed that switching technique is Selected Harmonic Elimination PWM(SHEPWM) and inverter switching frequency is less than 500[Hz]. Throughout experiment and simulation, it is estimated that switching technique used HEP is advanced SHEPWM and switching frequency is about 300[Hz]. Also leakage inductance in transformer is about
Analysis on the Induced Lightning Shielding Effect According to the Neutral Wire Installation Structure of a 22.9kV Distribution Line
Kim, Jeom-Sik ; Kim, Do-Young ; Park, Yong-Beom ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 2, 2010, Pages 191~196
The electricity distribution system in Korea is adopting a multi-grounding system. Protection of this distribution system against lightning is performed by installing overhead ground wires over the high voltage wires, and connecting the overhead ground wires to the ground every 200 m. The ground resistance in this system is limited not to exceed
and overhead ground wire and neutral wire are multiple parallel lines. Although overhead ground wire and neutral wire are installed in different locations on the same pole, this circuit configuration has duplicated functions of providing a return path for unbalanced currents and protecting the distribution system against induced lightning. Therefore, the purpose of this study is to analyze the induced lightning shielding effect according to the neutral wire installation structure of a 22.9kV distribution line in order to present a new 22.9kV distribution line structure model and characteristics. This study calculated induced lightning voltage by performing numerical analysis when an overhead ground wire is present in the multi-grounding type 22.9kV distribution line structure, and calculated the induced lightning shielding effect based on this calculated induced lightning voltage. In addition, this study proposed and analyzed an improved distribution line model allowing the use of both overhead wire and neutral wire to be installed in the current distribution lines. The result of MATLAB simulation using the conditions applied by Yokoyama showed almost no difference between the induced lightning voltage developed in the current line and that developed in the proposed line. This signifies that shielding the induced lightning voltage through overhead wire makes no difference between current and proposed distribution line structures. That is, this study found that the ground resistance of the overhead wire had an effect on the induced lightning voltage, and that the induced lightning shielding effect of overhead wire is small.
The Analysis of Insulation Properties with Electron Collision Processes on SF
So, Soon-Youl ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 2, 2010, Pages 197~201
gas would be used in power transformer, GIS (Gas insulated switchgear) and so on because of its electrically superior insulation and chemically stable structure. Recently, the reduction of
is required to avoid global warming and the researches on the dilution of
with other gases have been carried out.
mixture gases with
have drawn attention to the synergy effect. However, in order to understand the mechanism of the synergy effect, it is important to analyze and evaluate properties of mixture gases quantitatively. In this paper, we investigated the mechanism of synergy effect from electron collision processes and electron energy distribution by solving Boltzmann equation with propagator method. Three kinds of gases for dilution of
) are considered in this simulation. On the properties of
mixture gas, the variation of reduced electric field was shown highly within 0%~40% mixtures of
. And the more low-level electron energy has been distributed, the higher insulation capability has appeared.
Mechanical Reliability(Life-Time) Estimation for 25.8kV Eco Solid Insulated Switchgear
Lee, Do-Hoon ; Lee, Seog-Won ; Park, Seok-Weon ; Kim, Young-Geun ; Lee, Jhong-Ho ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 2, 2010, Pages 202~205
In this paper, mechanical reliability(Life-time) estimation method for 25.8kV SIS(Solid Insulated Switchgear) has been studied. Recently enacted KEPCO's standard includes clause that have to submit a warrantable reliability data for life-time(over B10 25 years) of an epoxy-solid insulating material. Accordingly, this research was carried out on the ALT(Accelerated Life Test) and Life-Estimation method for SIS's insulating material. Mechanical life-time estimation for SIS's insulating material is to verify reliability for tensile creep & fatigue stress, which is the major mechanical stress of SIS. This study proved that SIS's reliability for mechanical stress and established that confidence for estimation results in further verification test.
Reduction of Power Disturbance by Contact Loss Phenomenon of a High Speed Electric Train Using Passive Filters
Chang, Chin-Young ; Jin, Kang-Hwan ; Kang, Jeong-Nam ; Park, Dong-Kyu ; Kim, Yoon-Ho ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 2, 2010, Pages 206~211
Since high-speed train is a dynamic load in which electric power is externally supplied, contact loss between the catenary and pantograph occurs. This phenomena including vibrations generates frequently irregular arcs, which, in turn causes EMI. Thus it is very important to develop the approach to reduce arc phenomenon by contact loss, as speed of electric railway vehicle increases. In case of an electric railway vehicle using electrical power, compared with diesel rolling stock, Power Line Disturbance(PLD) such as harmonics, transient voltage and current, Electromagnetic Interference(EMI), and dummy signal injection etc usually occur. In this study, the dynamic characteristics of a contact wire and a pantograph suppling electrical power to high-speed train are investigated with an electrical response point. To implement power line disturbance induced by contact loss phenomenon for high speed train operation, a hardware simulator which considers contact loss between contact wire and pantograph as well as contact wire deviation is developed. It is confirmed by the experiments that contact loss effect is largely dependent on voltage conditions when the contact loss occurs. Also, a passive filter is designed to reduce power disturbance and the designed system is verified by experiment.
Analysis for Correlation Between Furfural and CO, CO
Gas Dissolved Inside Insulating Oil using Linear Regression Method
Kim, Jae-Hoon ; Park, Doo-Gie ; Han, Sang-Ok ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 2, 2010, Pages 212~217
When paper which was applied as insulation in oil-filled transformer was aged by thermal, its electrical, mechanical and chemical characteristics were changed and deteriorated. Therefore operating temperature was more higher, damage of paper was more quicker. Insulating paper which was generally made with cellulose was degraded, polymer of long length chain was decomposed as a monomer and CO,
gas and/or by-product such as furfural was produced from paper at the same time. In according with detection these gas and furfural by dissolved gas analysis(DGA) and high performance liquid chromatography(HPLC), we have investigated effects of CO,
gas and furfural on insulation of paper. Also we have analyzed for correlation between furfural and CO,
gas using linear regression method that was known as useful, credible statistical analysis.
A Study for Correlativity of Hydrogen Production Using Artificial Luminous Intensity
Jung, You-Ra ; Hong, Chang-Woo ; Choi, Young-Sung ; Lee, Kyung-Sup ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 2, 2010, Pages 218~221
This paper presents energy efficiency about an electrolyser which is related with the hybrid system of solar cell and fuel cell for using the system more fully. The water electrolyser is the exact reverse of a hydrogen fuel cell; it produces gaseous hydrogen and oxygen from water. Electrolyser technology may be implemented at a variety of scales wherever there is an electricity supply to provide hydrogen and/or oxygen for virtually any requirement. Also, this paper shows optimum operating point in the electrolyser for saving cost of the electrical energy with hybrid system.
Measurement Error Analysis of Ground Resistance Using the Fall-of-Potential Method According to the Locations of Auxiliary Probes
Kim, Dong-Woo ; Gil, Hyoung-Jun ; Kim, Dong-Ook ; Lee, Ki-Yeon ; Moon, Hyun-Wook ; Kim, Hyang-Kon ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 2, 2010, Pages 222~231
This paper presents numerical analysis of measurement errors of ground electrode using the fall-of-potential method. In order to analyze ground resistance error according to the positions of auxiliary probes, firstly, national and international standards were researched. Secondly, numerical ground resistance error of hemispheric electrode was analyzed according to the locations of auxiliary probes and the angle between probes. Then, error-reduced positions of auxiliary probes were shown according to the distance to auxiliary current probe versus ground electrode size. Finally, error compensation method was presented. The results presented in this paper provide useful information regarding ground resistance error of alternative positions of auxiliary probes in case that the auxiliary probes could not be located at the proper position in such cases as there are buildings, roadblock or underground metallic pipe at that position.
Analysis of RCD'S Material Degradation by Weathering Test
Kim, Chong-Min ; Bang, Sun-Bae ; Shong, Kil-Mok ; Yong, Shin-Jin ; Kim, Chang-Hwan ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 2, 2010, Pages 232~237
Fault rate of RCD is increasing due to deterioration and long period usage in domestic. According to Korean standards, the RCDs are installed in panel boards. When RCDs are installed at outdoor, the RCDs must be protected from uv, water etc. by using the housing. However, many RCDs are exposed to the external environment. As a results, many RCDs have malfunctions so that cause the electrical accidents. The RCDs manufactured by four makes were used as the sample to weathering test. Futhermore, those were analyzed the ingredients of RCD'S using SEM, EDX and FT-IR/TAR before and after weathering test.
Electrical Characteristics Analysis of LED Lamps using Internal Converter for Road and Street Lighting
Kim, Hyang-Kon ; Gil, Hyoung-Jun ; Choi, Hyo-Sang ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 2, 2010, Pages 238~244
In this paper, we studied electrical characteristics of internal converter type of LED lamps for road and street lighting. We surveyed electro-technical regulations and KS(Korean industrial standards) about LED luminairs. Waveforms of voltage and current, thermal distributions, insulation resistances between live parts and exposed conductive parts, and flame test of cover of LED lamps were experimented and analyzed. In regulations, insulation resistance between live conductors and exposed conductive parts should be greater than
in case nominal voltage of wiring is 220V. In KS codes, the value of insulation resistance should be greater than
while applying DC 500V or DC 100V. In the result of this study, waveforms of primary voltage and current were distorted. There was difference in waveforms of secondary voltage and current according to composition of converter. Mostly, insulation resistances were measured high more than regulation and code value but some measured points were measured badly(
). Cover of LED lamps was ignited easily. We expect that the results of this study would be helpful for revision of regulations and national codes for the electrical safety of LED road and street lighting.