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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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Utility Interactive Photovoltaic Generation System using a Space Vector Modulation
Cho, Moon-Taek ; Lee, Chung-Sik ; Lee, Sang-Cheol ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 4, 2010, Pages 345~350
This paper presents a Photovoltaic Generation system using a Space Vector Modulation. PWM voltage source inverter using inverter consists of complex type of electric power converter to compensate for the defect, that is solar cell cannot be developed continuously by connecting with the source of electric power for ordinary use. It can cause the effect of saving electric power, from 10 to 20[%]. Synchronous signal and control signal was processed by the 56F8323 microprocessor for stable modulation. Also, Waveforms output current and voltage of system controlled so that phase conforms and can supply electric power that stabilize by the unit power factor.
Field Weakening Control of IPMSM Based Next Generation High Speed Railway System
Jin, Kang-Hwan ; Yi, Du-Hee ; Kim, Sung-Je ; Chang, Chin-Young ; Kim, Yoon-Ho ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 4, 2010, Pages 351~357
In this paper, a vector control of the IPMSM drives for the next generation domestic high speed railway system is presented. The applied control method uses one pulse mode field weakening control in constant power region, and maximum torque control per ampere control in constant torque region considering current and voltage limits. An overmodulation control interval is inserted to improve the transient characteristics during transition period of the control modes. Simulation programs based on Matlab/Simulink are developed. Finally the designed system is verified by simulation and their characteristics are analyzed by the simulation results.
Determination of Parameters of Equivalent Circuit Taking No-Load Losses Into Account for Single-Phase Induction Motors
Jwa, Chong-Keun ; Kim, Do-Jin ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 4, 2010, Pages 358~363
This paper proposes a step-by-step method of determining the parameters of equivalent circuit which is considered the no load losses for the single phase induction motor which has the starting winding. This method is comprised of three steps, and the stator resistance which is measured by the method of voltage drop is treated as constant and the stator and the rotor leakage reactances are assumed to be the same in every step. The test results of no load and locked rotor test are used in the 1st and 2nd step, and the ratings of name plate of the motor are needed in the 3rd step. In the 1st step, the traditional equivalent circuit parameters are directly calculated by no load and locked rotor conditions. In the next step, five nonlinear simultaneous equations for five unknown parameters can be set up by no load and locked rotor equivalent circuits. These equations are solved by using the initial parameters obtained by the 1st step parameters. In the final step, three nonlinear simultaneous equations for rotor winding resistance, leakage reactance and no load losses component resistance can be set up by equivalent circuit under the rated operation. Three parameters are solved by using the 2nd step parameters. Thus, equivalent circuit parameters are gradually refined step by step. The validity of the proposed method is evaluated by comparing the computed values obtained by the equivalent circuit parameters with the experimental values of the load test.
An Development of Landscape Lighting Power Control System with Solar Cell Generator Equipment for Energy Saving
Kim, Dong-Wan ; Park, Sung-Won ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 4, 2010, Pages 364~371
In this paper, we propose the landscape lighting power control system with solar sell generator equipment for energy saving, and also which is included the landscape lighting power transformation device. The power transformation device can check inverse current in the power of the solar cell module and control the power of the battery. And we present the design of landscape lighting power control system. The power control system uses microprocessor with charging system and power transformation device. And also it can control the power of loads under consideration intensity of illumination. The landscape lighting loads are composed of LED(Lighting Emitting Diode) and HID(High Intensity Discharge)lamps. To evaluate property, we installed the solar cell array which generate three kilo watt power. Experimental results show that the proposed system can have stability and energy saving on the mixed configuration of electric loads with DC and AC lamps.
A Simple ESR Measurement Method for DC Bus Capacitor Using DC/DC Converter
Shon, Jin-Geun ; Kim, Jin-Sik ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 4, 2010, Pages 372~376
Electrolytic capacitors have been widely used in power electronics system because of the features of large capacitance, small size, high-voltage, and low-cost. Electrolytic capacitors, which is most of the time affected by aging effect, plays a very important role for the power electronics system quality and reliability. Therefore it is important to estimate the parameter of an electrolytic capacitor to predict the failure. The estimation of the equivalent series resistance(ESR) is important parameter in life condition monitoring of electrolytic capacitor. This paper proposes a simple technique to measure the ESR of an electrolytic capacitor. This method uses a switching DC/DC boost converter to measure the DC Bus capacitor ESR of power converter. Main advantage of the proposed method is very simple in technique, consumes very little time and requires only simple instruments. Simulation results are shown to verify the performance of the proposed method.
A Simple Capacitance Estimation Method for Failure Diagnosis of DC Link Electrolytic Capacitor in Power Converters
Shon, Jin-Geun ; Kim, Dong-Joon ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 4, 2010, Pages 378~383
Due to the large capacity and low cost, DC link electrolytic capacitors with of energy storage and voltage regulation are used for almost all types of power converter as the DC/AC inverter or DC/DC converter. Electrolytic capacitor, which is the most of the time affected by the aging effect, plays very important role for the power converter system quality and reliability. Therefore, this paper proposes a simple method to estimate the capacitance variation of an electrolytic capacitor in order to analyze the internal characteristic decrease and worn-out state of an electrolytic capacitor. Simulation results by using capacitor storage energy computation show the validity of the proposed capacitance estimation method.
A Study on Bidirectional Detection Safety Equipment Mechanism for Casualty Accidents Protection of Railroad Workers and Motorcars
Hwang, Jong-Gyu ; Jo, Hyun-Jeong ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 4, 2010, Pages 384~389
Workers maintaining at the railroad trackside may collide with the train since they cannot recognize the train approaching because of the sensory block phenomenon occurred due to their long hours of continued monotonous maintenance work. To reduce these casualty accidents of maintenance workers working at the trackside of railroad, we developed the wireless communication-based safety equipment for preventing accidents. The motor-cars for maintaining trackside facility have unique operational patterns suitable for urban environment. The several mechanism for developed safety equipment are represented in this paper.
Development of Digital Watermark Inserting and Detecting System for MPEG-2 Codec
Hwang, Seon-Cheol ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 4, 2010, Pages 390~394
This paper describes a study on developing an insert and detect system of digital watermark to the MPEG-2 coder and decoder. Digital watermark inserting system substitutes a coefficient among the DCT coefficients for new one. This replacement performs in MPEG-2 PS format. Watermark detecting system analyzes the input data stream of MPEG-2 and detect the probability of occurrence of a specific code or watermarking code. Our inserting system had very high invisibility and the PSNR of the results was 130 dB around. And our detection rate of watermark was over 99% in digital format and over 85% in analog captured format according to the quality of contents.
Coded Watermark Detecting Algorithm using a Blind Detecting Method Without Original Videos
Hwang, Seon-Cheol ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 4, 2010, Pages 395~400
Digital watermark technologies conceal the information of video contents that presents who is the owner and/or who is the user. In spite of various attempts to insert watermark, trials to mark information of users or buyers into contents have not been successful. It is the reason that the rates of detection is decreased seriously if there are some attacks to the contents such as resizing or bitrate decreasing. In this paper, the algorithm to insert the coded watermarks of users into video contents and to detect them without original contents under attacks will be described.
The DWA Design with Improved Structure by Clock Timing Control
Kim, Dong-Gyun ; Shin, Hong-Gyu ; Cho, Seong-Ik ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 4, 2010, Pages 401~404
In multibit Sigma-Delta Modulator, DWA(Data Weighted Averaging) among the DEM(Dynamic Element Matching) techniques was widely used to get rid of non-linearity that caused by mismatching of unit capacitor in feedback DAC path. this paper proposed the improved DWA architecture by adjusting clock timing of the existing DWA architecture. 2n Register block used for output was replaced with 2n S-R latch block. As a result of this, MOS Tr. can be reduced and extra clock can also be removed. Moreover, two n-bit Register block used to delay n-bit data code is decreased to one n-bit Register. In order to confirm characteristics, DWA for the 3-bit output with the proposed DWA architecture was designed on 0.18um process under 1.8V supply. Compared with the existing architecture. It was able to reduce the number of 222 MOS Tr.
Modelling of PV System and MPPT Control
Song, Ho-Bin ; Baek, Dong-Hyun ; Cho, Moon-Taek ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 4, 2010, Pages 405~410
In this paper, the simulation of solar system was used to facilitate PSPICE. Solar cells, Controller, MPPT system, DC-DC system modeling, and easy to use, made to the library. To prove the validity of the library for the temperature and space radiation were simulated and behavioral characteristics were identified. To prove the validity of the simulation, the hardware was constructed to the same conditions. Implemented using the hardware and the DSP controller for a real system, the results were confirmed by experiments.
Simulation for the Flowing Water Purification with Spring Shape Inside Chamber
Jung, Byung-Gyeon ; Jeong, Byeong-Ho ; Lee, Jin-Jong ; Jung, Byeong-Soo ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 4, 2010, Pages 411~416
Interest in application of ultraviolet light technology for primary disinfection of potable water in drinking water treatment plants has increased significantly in recent years. The efficacy of disinfection processes in water purification systems is governed by several key factors, including reactor hydraulics, disinfectant chemistry, and microbial inactivation kinetics. The objective of this work was to develop a computational fluid dynamics(CFD) model to predict velocity fields, mass transport, chlorine decay, and microbial inactivation in a continuous flow reactor. In this paper, It describe the how to design optimal UV disinfection device for ground water, BWT and rainwater. Spring shape instrument silver coated located in inner side of disinfection chamber. It make lead the active flowing movement target water and maximize disinfection performance. To search the optimal design method, it was performed computer simulation with 3D-CFD discrete ordinates model and manufactured prototype. Using proposed design method, performed simulation and proved satisfied performance.
Analysis on DC Glow Discharge Properties of Ar Gas at the Atmosphere Pressure
So, Soon-Youl ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 4, 2010, Pages 417~422
Atmosphere Plasma of Gas Discharge (APGD) has been used in plasma sources for material processing such as etching, deposition, surface modification and so on due to having no thermal damages. The APGD researches on AC source with high frequency have been mainly processed. However, DC APGD studies have been not. In order to understand APGD further, it is necessary to study on fundamental properties of DC APGD. In this paper, we developed a one-dimensional fluid simulation model with capacitively coupled plasma chamber at the atmosphere pressure (760 [Torr]). Nine kinds of Ar discharge particles such as electron (e), positive ions (
) and neutral particles (
(3) and Ar gas) are considered in the computation. The simulation was worked at the current range of 1~15 [mA]. The characteristics of voltage-current were calculated and the structure of Joule heating were discussed. The spatial distributions of Ar DC APGD and the mechanism of power consumption were also investigated.
Development of Hand-Held Type Sheet Resistance Meter Based on a Dual-Configuration Four-Point Probe Method
Kang, Jeon-Hong ; Yu, Kwang-Min ; Kim, Wan-Seop ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 4, 2010, Pages 423~427
Portable sheet resistance-measuring instrument using the dual-configuration Four-Point Probe method is developed for the purpose of precisely measuring the sheet resistance of conducting thin films. While single-configuration Four-Point Probe method has disadvantages of applying sample size, shape and thickness corrections for a probe spacing, the developed instrument has advantages of no such corrections, little edge effects and measuring simply and accurately the sheet resistance between
Optimal Division Model Configuration Plan According to 6 Divisions 3 Ties in Korea Distribution System
Lee, Dae-Dong ; Son, Sung-Hwan ; Ha, Bok-Nam ; Hyun, Dong-Seok ; Kim, Young-Dal ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 4, 2010, Pages 428~433
According as economy grows, demand for power increases and satisfaction of customer about electricity quality is rising. There is in trend that investment expense by continuously increased supply of electric power equipment is on the increase continuously, but management efficiency improvement through curtailment of supply of electric power equipment investment expense through efficient operation is required rather than to increase investment. In this study, reconsidered about 6 divisions 3 ties that is distribution line basis configuration of Daejeon Geumsan area and analyzed division and tie present condition of truthful distribution System. Examined problem analyzing average division number, tie number and tie switch number, searched about most suitable division that consider load. Hereafter, I wish to take advantage of analysis result in most suitable division and tie of truthful distribution system for power failure section reduction and investment expense curtailment.
Analysis on Induced Lightning of a 22.9kV-Y Distribution Line Using a Reduced Model
Kim, Jeom-Sik ; Kim, Do-Young ; Park, Yong-Beom ; Kwon, Sin-Won ; Gil, Kyung-Suk ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 4, 2010, Pages 434~439
This study fabricated a simulation facility which reduced the structure of a current distribution line to 50:1 in order to analyze the induced lightning shielding effect of a 22.9kV-Y distribution line according to ground resistance capacity, grounding locations, etc. When installing an overhead ground wire, the standard for grounding a distribution line with a current of 22.9kV-Y requires that ground resistance in common use with the neutral line be maintained less than
every 200m span. The reduced line for simulation had 7 electric poles and induced lightning was applied to the ground plane 2m apart from the line in a direction perpendicular to it using an impulse generator. If induced voltage occurred in the line and induced current flowed through the line due to the applied current, the induced voltage and current of the 'A' phase were measured respectively using an oscilloscope. When all 7 electric poles were grounded with a ground resistance of less than
respectively, the combined resistance of the line was
. When an average current of 230A was applied, the average induced voltage and current measured were 1,052V and 13.8A, respectively. Under the same conditions, when the number of grounding locations was reduced, the combined resistance as well as induced voltage and current showed a tendency to increase. When all 7 electric poles were grounded with a ground resistance of less than
, the combined resistance of the line was
. When an average current of 236A was applied, the average induced voltage and current of the 'A' phase calculated were 1,068V and 15.6A, respectively. That is, in this case, only the combined resistance was greater than when all 7 electrical poles were grounded, and the induced voltage and current were reduced. Therefore, it is thought that even though ground resistance is slightly higher under a construction environment with the same conditions, it is advantageous to ground all electric poles to ensure system safety.
Measurement of Vibration Signals of a Gun Barrel Type Structure using Mechanical Filter
Ryu, Bong-Jo ; Koo, Kyung-Wan ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 4, 2010, Pages 440~443
This paper deals with the method of vibration measurement of a gun barrel structure using mechanical filter. When a bullet with high speed is moving within a gun barrel type structure with low bending vibration frequencies, it is difficult to measure the bending vibration signals of the structure. For example, noncontact type sensors such as displacement or velocity sensor are not appropriate for the measurement of vibrational signals because of the movement effect of the equipment frame through the moving structures or effect of the ground vibration. One of contact type sensors such as accelerometer is profitable for measurement of vibrational signals because of its wide measurement ranges. In the case of a gun barrel structure including high vibrational signals like shock waves, however, it is necessary to propose vibration measurement method filtering high frequencies. The purpose of the paper is to propose the proper vibrational measurement technique filtering high frequencies of a gun barrel type structure.
Comparative Experimental Study on Color Meter for Monitor Color Correction
Han, Byung-Jo ; Koo, Kyung-Wan ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 4, 2010, Pages 444~449
The PID control to the monitor color correction was applied. Converted Gamma LUT was applied to the video card. Color and brightness information from the PID controller was used as control inputs. Color and brightness information from a calibrated monitor is measured again. Then, the difference between the preset values for the PID controller was compensated by the feedback. The software measured by color meter was used for color and brightness information. All of the monitor does not measure the color and brightness was measured by sampling. The color and brightness from the monitor were measured not by complete enumeration but by sampling. In the experiment, the original image was displayed on the same monitor as well as two other brands, and then, Gamma and Contrast were measured and compared.
The Performance Modeling of a VGA Bolometer with Self-Aligned Structure
Park, Seung-Man ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 4, 2010, Pages 450~455
The performance modeling of a
-bolometer with the self-aligned thermal resistor structure is carried out. The self-aligned thermal resistor can be utilized for the maximizing the thermal resistance and the fill factor of a bolometer, so the performance improvement can be expected. From the results of the performance modeling of the micro-bolometer with self-align thermal resistor for a
microbolometer designed with
minimum feature size, the drastic improvements of NETD from 38.7 mK to 19.1 mK, responsivity of 1.9 times are expected with a self aligned thermal resistor structure. The main reason for the performance improvements with a self-aligned thermal resistor structure comes from the increasement of the thermal resistance.
Analysis of the Principle and Operation Characteristics of an (I
-Free ELB) Operated by an Active Component
Choi, Chung-Seog ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 4, 2010, Pages 456~461
This study compares the criteria of earth leakage breakers (ELB) and analyzes the characteristics of an Igc-free ELB operated by an active component which is not misoperated by capacitive current. Even for the same ELB, the earth leakage current flowing through the human body is estimated to be differ greatly depending on the power source, voltage, location and status of contact, contact time duration, etc. Earth leakage breakers are classified based on the rated voltage, rated sensing current, rated operating time etc. Mounting and demounting of the existing equipment can be performed easily since an
-free ELB is manufactured with the same structure as a conventional ELB. The rated operating current of a conventional and an
-free ELB is 30mA, the sensing current is 25mA and the rated non-operating current is 15mA. In the analysis of non-operating current characteristics, the rated non-operating current of 15mA was satisfied up to a 20mA charging current in the conventional ELB, but does not satisfy the rated non-operating current as it operates when the resistive leakage current is lower than 15mA for a charging current exceeding 20mA. Also, the ELB is misoperated without a resistive leakage current when the charging current exceeded 25mA. However, the newly developed
-free ELB satisfied the rated non-operating current even when the charging current was 60mA. Also, in comparison to the interrupting characteristics, it was confirmed that the charging current satisfying the rated non-operating current of the
-free ELB was three times higher than that of the conventional ELB.
A Study on the Safety Estimation of Wiring Connection Connector Manufactured by Housing Type
Choi, Chung-Seog ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 4, 2010, Pages 462~466
The purpose of this study is to evaluate the safety of a wire connector fabricated for the effective installation of a lighting fixture including its contact resistance, insulation resistance, withstanding voltage characteristics, etc., and to provide the basis for the analysis and judgment of PL(Product Liability) dispute by presenting a damage pattern due to a general flame and overcurrent. This study applied the Korean Standard (KS) for the incombustibility test of the connector using a general flame and performed an overcurrent characteristics test of the connector using PCITS (Primary Current Injection Test System). The contact resistance of the housing connector was measured using a high resistance meter and the insulation resistance was measured using a multimeter. In addition, a supply voltage of AC 1,500V for testing the withstanding voltage characteristics was applied to both ends of the connector. Measurement was performed on 5 specimens and the measured values were used as a basis for judgment. Since the connector is fabricated in the form of a housing, it can be connected and separated easily and has a structure that allows no foreign material to enter. In addition, since it has a structure that allows wires to be connected only when their polarity is identical, any misconnection that may occur during installation can be prevented. When the incombustibility test was performed by applying a general flame to the connector, it showed outstanding incombustibility characteristics and the blade and blade holder connected to the housing remained firmly secured even after the insulation sheath (PVC) was completely destroyed by fire. In addition, the mechanism of the damaged connecting wire showed a comparatively uniform carbonization pattern and it was found that some residual melted insulation material was attached to both ends. In the accelerated life test (ALT) to which approximately 500% of the rated current was applied, the connector damage proceeded in the order of white smoke generation, wire separation, spark occurrence and carbonization. That is, it could be seen that the connector damaged by overcurrent lost its own metallic color with traces of discoloration and carbonization. The contact resistance of the connector at a normal state was 2.164mV/A on average. The contact resistance measured after the high temperature test was 3.258mV/A. In addition, the insulation resistance after the temperature test was completed was greater than
and the withstanding voltage test result showed that no insulation breakdown occurred to all specimens showing stable withstanding voltage and insulation resistance characteristics.
A Study on the Real Condition and Life Time of the RCD
Kim, Chong-Min ; Choi, Myeong-Il ; Kim, Young-Seok ; Bang, Sun-Bae ; Shong, Kil-Mok ; Seo, Jung-Youl ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 4, 2010, Pages 467~472
years. and the MTTF of RCDs which are used indoor area is
years, the MTTF of RCDs which are used outdoor area is
years. Futhermore, the MTTF of RCDs which are used in dry area is a
years, the MTTF of RCDs which are used in dust area is
years, the MTTF of RCDs which are used in moisture area is
Analysis on the Short Circuit Current of a Low Voltage Direct Current(DC) Distribution System using PSCAD/EMTDC
Ahn, Jae-Min ; Jeon, Jeong-Chay ; Lim, Young-Bae ; Bae, Seok-Myeong ; Byeon, Gil-Sung ; Lee, Kyoung-Ho ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 4, 2010, Pages 473~476
In this paper, we analyzed the short circuit current of a low voltage direct current distribution system. For the analysis, we performed the modeling of the low voltage direct current distribution system with a 6-pulse three-phase thyristor rectifier using the PSCAD/EMTDC, surveyed impedance of sources, transformers and distribution lines to run a simulation. A result of the simulation is that short circuit currents of the direct current distribution system with the rectifier decreased due to a thyristor-ON-resistance(Ron). But in case of the low thyristor-ON resistance, output fault current of the rectifier increased over three-phase short circuit current of an AC power system without a rectifier by regular ratio of the rectifier. Because the output fault current of the rectifier can increase over interrupting the capacity of circuit breakers, studying short circuit currents of a low voltage direct current distribution system with a rectifier is necessary for introducing the direct current distribution systems.
Characteristics on the Transformer-Type SFCL According to Reclosing Operation the Voltage Increase
Choi, Soo-Geun ; Choi, Hyo-Sang ;
The Transactions of the Korean Institute of Electrical Engineers P, volume 59, issue 4, 2010, Pages 477~480
Fault current in power system is expected to increase by demand of power capacity. Therefore, when the fault occurred, fault current was increased in the power system. Many studies have been progressed to limit the fault current. Superconducting fault current limiter (SFCL) is one of them which has been studied in worldwide. In this paper, we will analyze characteristics of a transformer-type SFCL by reclosing operation when the voltage increases. Twice opening times in the reclosing of circuit breaker were set as the 0.5 and 15 seconds, respectively. Turn's number of primary and secondary coils set 4:2 and we increased voltages from 120V to 280V for each experiment. By the current waveform, maximum fault current in second and third cycles was lowered when the voltage was increased. In the recovery waveform, recovery time was increased as the voltage was increased. The reason was that power burden of the SFCL increased when consumption power was increased, so the time to get back to SFCL took longer. We compared the characteristics of a resistive-type and transformer-type SFCL. As a result, we found that the fault current of a transformer-type was lower than resistive-type and recovery time of the SFCL was shorter. Consequently, transformer-type SFCL was more profitable for limitation of fault current and recovery time under the same condition for reclosing operation.