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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 57, Issue 4 - Dec 2008
Volume 57, Issue 3 - Sep 2008
Volume 57, Issue 2 - Jun 2008
Volume 57, Issue 1 - Mar 2008
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Development of the Remote Monitoring System for Leakage Current Using Wireless Communication
Park, Sung-Won ; Park, Ji-Ho ; Kim, Dong-Wan ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 4, 2008, Pages 349~355
In this paper, a wireless remote monitoring system for leakage current of distribution board is developed. In the developed system, signals of the leakage current of distribution board are transmitted to a monitoring system using wireless communication. The developed system is consisted of a comparative module, control module, a wireless communication module, and hand held terminal. The developed system has any facilities which can check a leakage current with real time, send to the user this fact using a wireless remote interface method. And also developed system can take precaution for an accident by leakage current.
Current Control of Switched Reluctance Motor with Delta Modulation Method on EPLD Logic Design
Yoon, Yong-Ho ; Kim, Jae-Moon ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 4, 2008, Pages 356~361
The conventional drive system of SRM has a current sensor per each phase. The torque demand signal generated by the outer control loop is translated into individual current reference signal for each phase. The torque is controlled by regulating these currents. Using the SRM in a variable-speed control, the phase currents are generally regulated to achieve a square wave. The simplest form of current regulation uses fixed frequency delta modulation of the phase voltages. The aim of this paper is to regulate 3-phases current of SRM by only single current sensor using delta modulation with digital chip. In this paper, the asymmetric bridge converter which is able to control independently phases and be excited simultaneously is used as the driver system for 6/4 poles SRM. And the current sensor is replaced 3 sensors of each phase with only one on bus line of converter so as to detect current of every phase. The proposed delta modulation technique has been implemented in a simple digital logic circuit using EPLD(Electrically Programmable Logic Device). This method is verified through simulation and experiment results.
Analysis of Harmonics Effect and Development of Improved Load Model for Residential Loads
Ji, Pyeong-Shik ; Lee, Dae-Jong ; Lee, Jong-Pil ; Park, Jae-Won ; Lim, Jae-Yoon ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 4, 2008, Pages 362~369
In this study, we developed RBFN(Radial Basis Function Networks) based load modeling method with harmonic components. The developed method considers harmonic information as well as fundamental frequency and voltage considered as essential factors in conventional method. Thus, the proposed method makes it possible to effectively estimate load characteristics in power lines with harmonics. RBFN has some advantage such as simple structure and rapid computation ability compared with multi-layer perceptorn which is extensively applied for load modeling. To verify the effectiveness, the proposed method has been intensively tested with various dataset acquired under the different frequency and voltage and compared it with conventional methods such as polynomial method, MLPN and RBFN with no harmonic components.
Analysis for Electrical Stress of Power Capacitor
Kim, Jong-Gyeum ; Park, Young-Jeen ; Lee, Eun-Woong ; Lee, Dong-Ju ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 4, 2008, Pages 370~376
Power capacitors is widely used for power factor correction and component of passive filter in the user power systems. Recently, application of non-linear load is gradually increased. Non-linear load produces harmonic components of current. There are series resonance and parallel resonance when capacitors are applied in the user electrical application. If this harmonic component matches resonance, voltage and current is magnified and has severely an influences on capacitor. This paper purposes a new method for the magnitude of voltage and current by the frequency scan analysis without equivalent circuit for the actual circuit at the resonance condition.
A Selection of an Optimal Mother Wavelet for Stator Fault Detection of AC Generator
Park, Chul-Won ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 4, 2008, Pages 377~382
For stator winding protection of AC generator, KCL(Kirchhoff's Current Law) is widely applied. Actually a CRDR(Current Ratio Differential Relay) based on DFT(Discrete Fourier Transform) has been used for protecting generator. It has been pointed out that defects can occur during the process of transforming a time domain signal into a frequency domain one which can lead to loss of time domain information. Wavelets techniques are proposed for the analysis of power system transients. This paper introduces an algorithm to choose a suitable Mother Wave1et for generator stator fault detection. For optimal selection, we analyzed db(Daubechies), sym(Symlets), and coif(Coiflects) of Mother Wavelet. And we compared with performance of the choice algorithm using detail coefficients energy and RMS(root mean square) error. It can be improved the reliability of the conventional DFT based CRDR. The feasibility and effectiveness of the proposed scheme is proved with simulation using collected data obtained from ATP (Alternative Transient Program) package.
Analysis of Operating Characteristic of Self Excited Induction Generator with Steinmetz Connection
Kang, Sang-Su ; Jwa, Chong-Keun ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 4, 2008, Pages 383~387
This paper analyzes the operation characteristics of a self excited induction generator with Steinmetz connection. For this analysis, the symmetrical components analysis is used to obtain the related expressions and the excitation capacitance and the magnetizing reactance are determined in turn by the condition of self excitation which includes the input impedance of the generator as viewed across load terminals. Two simultaneous equations of the condition of self excitation itself are solved by using the real and imaginary function in an application software. This method is applied to simulate the operation characteristics when the generator is driven at rated speed and the specified excitation capacitor is connected across the lagging phase. The results show that better operation characteristics except generated frequency are obtained by using relatively large excitation capacitance and resistive load.
Development of Battery Type Powered Handpiece Drive System for Surgical Operation
Ha, Jung-Jun ; Yoon, Yong-Ho ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 4, 2008, Pages 388~394
The purpose of this paper is concerned with a battery type powered handpiece drive system for surgical operation. Battery type powered surgical handpiece is suitable for delicate surgical operating. The conventional air-type handpiece has a mechanical noise, a strong oscillation and a danger of infection. And the conventional contact switching type handpiece has problems that is restricted by surroundings. By reason of this kind, we studied noncontact switching type surgical handpiece to change conventional air type surgical handpiece and contact switching type. Also in this paper we develop the battery type power handpiece drive system for surgical operation using controller IC UC3625 of UNITRODE CO. Finally some experimental and simulation results are provided to demonstrate the validity of the proposed battery type power handpiece drive system.
A Study on the Fabrication of P(VDF- TrFE) Organic Thin Films and Piezoelectric Characteristics
Park, Su-Hong ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 4, 2008, Pages 395~399
The purpose of this paper is to investigate the fabrication of P(VDF-TrFE) organic thin films through the vapor deposition method and the piezoelectric properties of the organic thin films thus produced. Vapor deposition was performed under the following conditions: the working temperature, and the pressure of reaction chamber were
Torr, respectively. The molecular structure and crystallinity of the evaporated organic thin films were evaluated by using a FT-IR (Fourier-Transform Infrared spectroscopy) and XRD (X-ray diffractometry), The results showed that crystallinity increased with an increase in the substrate temperature. When the P(VDF-TrFE) organic thin films were fabricated by increasing the substrate temperature, its piezoelectric coefficient(
Development of Individual Trespassing Detector for Building
Kim, Myung-Ho ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 4, 2008, Pages 400~403
In this work, an individual trespassing detector using a PIR sensor to detect infrared rays only between the range of
radiated from the body is proposed. This detector using FIR sensor detects not insect or object but human body, It doesn't restrict the inhabitant's behavior because the filter of pm sensor is designed to have face angle and the detector only detects the window area. The existing wide angle filter, RIR sensor, detects
angle while the face angle filter sensor on this paper detects
angle with 3cm of face angle filter from 2m of detecting distance. In case of interruption of electric power, 250mAh of lithium-ion battery has worked for 10 hours consuming 22mA in normal state. Meanwhile, in case of interruption of electric power, 250mAh of battery has worked for 4 hours consuming 60mA in trespassing detecting state. Projector, receptor, controller and alarm are put on one PCB in order to make it convenient to install without any special installation skill.
Development of Energy Saving System Using the Microwave Sensor
Jung, Soon-Won ; Lee, Jae-Jin ; Koo, Kyung-Wan ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 4, 2008, Pages 404~407
Because of directly receiving the thing in which a microwave is reflected and comparing the frequency, the microwave sensor with doppler effect completely overcomes the problem of the passive infrared sensor. The microwave sensor with doppler effect well operates about a temperature, the dust, and the peripheral noise because of being dull in the most of ambient conditions. The system developed in this research is the electricity saving detection sensor which it senses the real time action of a man as the microwave sensor and automatically turns on the electric lamp and turns off, minimizes the electrical energy consumption. Since the microwave sensor is not influenced in the light, the dust, and the natural element like the ambient temperature, the effectiveness is considered to be superior to the passive infrared sensor being used currently. There was the energy reduction effect more than about 60% in the performed example which established this system. When this was compared with the construction cost, the cost of establishing payback period was about 1-1.5 year. The microwave sensor with doppler effect developed from this research result is convinced in the future to do enough for the electric energy saving.
A Heating Apparatus for Semiconductor Manufacturing using Direct Heating Method
Jung, Soon-Won ; Koo, Kyung-Wan ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 4, 2008, Pages 408~411
As to this research is new structure of the semiconductor substrate heating apparatus. The fast thermoresponsive 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. For this, it adheres closely to the substrate, in which the photosensitive film is coated and the heating plate layer, adhering closely to the floor side of a substrate the mica layer which adheres closely to the floor side of the upper heating plate layer in order to minimize an insulation and heat loss, and the lower part of the mica layer and it is comprised of the floor plate layer. The heating plate layer forms the continued groove portion over the floor side whole. The sheath heater for heating a substrate is inserted with the groove portion and the heating plate layer is comprised. It is confirmed that by using the new substrate heating structure, the temperature change of the heating plate against the time is observed. Then, there is the electric power saving effect of about 40% in comparison with the existing method.
Evaluation for Ratio Error of Voltage Transformer Comparator using Standard Resistors
Han, Sang-Gil ; Kim, Yoon-Hyoung ; Jung, Jae-Kap ; Han, Sang-Ok ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 4, 2008, Pages 412~416
We have developed the calibration technique of the VT comparator using nonreactive standard resistors, which evaluates both accuracy and linearity of the VT comparator by comparing experimental values with theoretical values. The correction values of VT comparator obtained by using both our method and wide ratio error VT are consistent within the expanded uncertainty. Furthermore the specification for ratio error of VT comparator have been revaluated.
Comparison of the Poor Insulator Detecting Technique for the Reliability Enhancement of the Electric Power Facilities
Jung, Soon-Won ; Koo, Kyung-Wan ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 4, 2008, Pages 417~423
For the evaluation in the safety of outdoor insulator, there are various methods such as: visual observation; voltage measurement; use of ultrasonic wave due to partial discharge; electric field measurement; use of infrared/ultraviolet sensor-type camera. However, many problems have been issued regrading the reliability of the evaluation test and safety of testing operation. Accordingly, the present study has investigated and analyzed the characteristics and mechanisms of the insulator deterioration, in order to obtain an optimal method for detecting poor insulator so that the reliability of power facilities can be enhanced. Besides, based on theoretical analysis of domestic and international detection methods for poor insulator, the reliability has been compared and evaluated quantitatively. As a result, it was shown that the corona camera would be the best choice for domestic workplace application in detecting poor insulator for enhancing the reliability of power transmission line.
Active Vibration Measuring Sensor for Nondestructive Test of Electric Power Transmission Line Insulators
Lee, Jae-Kyung ; Park, Joon-Young ; Cho, Byung-Hak ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 4, 2008, Pages 424~430
A new active vibration measurement system in electric power transmission line is presented, using in the nondestructive test. With a permanent magnet and a couple of coils, the system exerts impact force to a test object and in turn picks up the vibration of the object. The natural frequency with the amplitude obtained from the system are used as a basis for the detection of defects in the object. The system is controlled by an electronic device designed to facilitate the fully automated testing process with consistent repeatability and reliability which are essential to the nondestructive test. The system is expected to be applied to the wide area of defect detection including the classification of mechanical parts in production and inspection processes.
Extension of Absolute Evaluation Technique for Ratio Error and Phase Displacement of Core Type Current Transformers: Ip =
Kim, Yoon-Hyoung ; Han, Sang-Gil ; Jung, Jae-Kap ; Han, Sang-Ok ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 4, 2008, Pages 431~436
We have extended an absolute evaluation method to obtain the ratio error and phase displacement of a current transformer (CT) up to primary current of 40,000 A by measuring four parameters of equivalent circuit in CT. The method was applied to CTs under test with the current ratios in the range of 5,000 A / 5 A - 40,000 A / 5 A. The ratio error and phase displacement of the CTs under test obtained in this study are consistent with those measured at the national institutes in Canada and Germany using the same CTs under test within an expanded uncertainty (k = 2) in the overall current ratios.
Evaluation Technique for Ratio Error and Phase Displacement of Current Transformer Comparator
Kim, Yoon-Hyoung ; Han, Sang-Gil ; Jung, Jae-Kap ; Han, Sang-Ok ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 4, 2008, Pages 437~443
We have developed an evaluation technique for both ratio error and phase displacement of current transformer (CT) comparator by using the precise standard capacitors and resistors. By applying this technique to equivalent circuit of CT comparator evaluation system, we can obtain the calculated and measured ratio errors (or phase displacements) in the CT comparator. Thus we can evaluate ratio errors and phase displacement of CT comparator by comparing the calculated and measured ratio errors (or phase displacements). The method was applied to CT comparator under test with the ratio errors and phase displacement ranges of
crad, respectively. Finally we have compared the ratio error and phase displacement of the CT comparator obtained in this method with specifications of two companies.
Surge Voltage Distribution at the Different Bonding Practice During a Direct Lightning Stroke to Building
Lee, Jae-Bok ; Chang, Sug-Hun ; Myung, Sung-Ho ; Cho, Yuen-Gue ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 4, 2008, Pages 444~450
There are several ways to bond to building grounding systems for reducing GPR(ground potential rise) and EMI resulting from power system faults or lightning stroke to building. In order to verify effective bonding practice, the GPR and voltage of equipment due to the direct stroke to building are calculated with ATP-EMTP model for transformer, transmission line and MOV(Metal oxide varistor). The simulated model shows a satisfactory accuracy compared with experimental result for the
simulated current pulse. It is observed that separate grounding can cause dangerous voltage to the building equipment and the performance of surge protective device can improve when it is installed to the protected equipment in distance as short as possible.
Damaged Pattern Analysis of Incandescent Lamp by External Flame
Kim, Hyang-Kon ; Kim, Dong-Ook ; Lee, Ki-Yeon ; Choi, Chung-Seog ; Choi, Hyo-Sang ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 57, issue 4, 2008, Pages 451~456
In this paper. we experimented and analyzed about evaporation and breaking process of filament by external flames and adsorption pattern in lamp bulb of evaporated filament particle according to the set-up directions of incandescent lamps. In the results of experiments, we could know that filament evaporation behavior of incandescent lamp that is established by down direction happened most vigorously and is difference in adsorption pattern of filament particle that is vaporized according to set-up directions. Also, glass bulbs were melted and filaments were evaporated by external flames, and finally molten marks were discriminated. We expect that become important data that this study finding reveals burnout cause of incandescent lamp in scene of a fire.