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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
Journal Basic Information
Journal DOI :
The Korean Institute of IIIuminating and Electrical Installation Engineers
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Volume & Issues
Volume 25, Issue 12 - Dec 2011
Volume 25, Issue 11 - Nov 2011
Volume 25, Issue 10 - Oct 2011
Volume 25, Issue 9 - Sep 2011
Volume 25, Issue 8 - Aug 2011
Volume 25, Issue 7 - Jul 2011
Volume 25, Issue 6 - Jun 2011
Volume 25, Issue 5 - May 2011
Volume 25, Issue 4 - Apr 2011
Volume 25, Issue 3 - Mar 2011
Volume 25, Issue 2 - Feb 2011
Volume 25, Issue 1 - Jan 2011
Selecting the target year
A Study on the Design Process of Night-Scape Lighting Application of LED
Park, Joo-Young ; Oh, Min-Seok ; Kim, Hway-Suh ; Kang, Tae-Kyung ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 25, issue 6, 2011, Pages 1~8
DOI : 10.5207/JIEIE.2011.25.6.001
Night-Scape Lighting with the use of LED lighting has become very popular recently by the merits of energy saving, environmental friendlyness, sensitivity and conversion trends. LED lighting designs are being used diversly as outer elements for screen media stage production as well as buildings with fusioning of information technology. However, methods for analyzing the cases effectively are far from completion. This research evaluates the recent trends of Night-Scape Lighting with LED and processes it through database and aims to propose LED Night-Scape Design process for the various architectural night-scape lighting designs.
Design of New LED Drive using Energy Recovery Circuit
Han, Man-Seung ; Lim, Sang-Kil ; Park, Sung-Jun ; Lee, Sang-Hun ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 25, issue 6, 2011, Pages 9~17
DOI : 10.5207/JIEIE.2011.25.6.009
The high-power LED (Light Emitting Diode) which is recently gaining popularity as a digital light source has such advantages as low power consumption, long life, fast switching speed, and high efficiency. Thus, many efforts are being made to use the high-power LEDs for general lighting. This paper proposes LED driving circuit uses a DC/DC converter that can recover energy to compensate for the current variations caused by changes in LED equivalent resistance following a temperature change instead of serial resistance. The maximum input voltage of this DC/DC converter has low voltage variations by temperature change when the rated current is formed. In order to return current to the input side, we need a high boosting at low power. Thus, to improve the low efficiency of power converter, the power converter can be configured in such a way to gather the powers of low-capacity DC/DC converters and return the total power. Experiments showed that the proposed system improved efficiency compared to the conventional LED drive using the existing DC/DC converter.
A Design of LED Lighting Controller for use of Solar Battery
Kim, Byun-Gon ; Lee, Ok-Jae ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 25, issue 6, 2011, Pages 18~27
DOI : 10.5207/JIEIE.2011.25.6.018
LED lighting because of high efficiency, long life, friendly environment, as a general lighting of the next generation, has been substituted for incandescent bulb and fluorescent lamp. The proposed system for use of solar battery is the intelligent controller for LED street lights which is improved the method of battery charging and charging efficiency in winter to extend battery life cycle, controlled lighting current according to SoC and in steps. Also, it is implemented emotional lighting which is controlled with the surrounding environment, by using colorful sub LED to take up 10[%] of a source of total light, white LED. As a lab results, the proposed system was implemented functions to adapt to the environmental changes, and improved the charging efficiency and battery life cycle.
The Development of Transient Analysis Model and Performace Analysis of 345[kV] 100[MVA] STATCOM
Yoon, Jong-Su ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 25, issue 6, 2011, Pages 28~34
DOI : 10.5207/JIEIE.2011.25.6.028
This paper describes the development of the transient analysis model of 345[kV] 100[MVA] STATCOM and the result of the performance analysis. The Korea power utility company, KEPCO began a commercial operation of a 100[MVA] STATCOM(Static synchronous COMpensator) at 345[kV] Migeum substation in Seoul. In order to operate a new control device like STATCOM to the power system, suitable transient model is needed. Therfore, Korea Electric Power Coporation(KEPCO) developed a transient analysis models using EMTDC/PSCAD. The development of this transient analysis model is based on the actual STATCOM S/W algorithm and H/W specification that was provided by its manufacture. Through this model, the transient/dynamic performance of STATCOM at Migeum substation can be analyzed.
Examinations on the Reasonable Measuring Methods of the Soil Resistivity for Design of Grounding System
Lee, Bok-Hee ; Kim, Ki-Bok ; Lee, Seung-Hoon ; Choi, Jong-Hyuk ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 25, issue 6, 2011, Pages 35~41
DOI : 10.5207/JIEIE.2011.25.6.035
In order to design effectively the grounding system, it is very important to determine the optimum soil resistivity at the desired location of the connection to earth. This paper deals with the reasonable methods of measuring the soil resistivity where grounding electrodes are buried. The soil resistivity at three test sites with different resistivity of soil were measured as functions of the spacing between the test probes in the Wenner's four-point method and the length of test ground rod in the three-point method. In the case of the three-point method, the length of test ground rod of 2-10[m] in length was appropriate in two-layered soil structure. In the length range of 2-10[m], the results measured by the three-point method using the test ground rod with the length corresponding to the spacing between the test probes of the Wenner's four-point method are in good agreement with the data obtained from the Wenner's four-point method.
The Comparison of Output Characteristic by the Electro-magnetic Structure Modification of the Axial Flux Type Permanent Magnet Synchronous Generator
Jung, Tae-Uk ; Bae, Byung-Duk ; Kim, Hoe-Cheon ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 25, issue 6, 2011, Pages 42~48
DOI : 10.5207/JIEIE.2011.25.6.042
Generally, the structure without the stator core Axial Field Permanent Magnet (AFPM) generator was simple and there was nearly no cogging toque. And because it had the wide driving rate area, it had been being mainly used in the small wind power generation system. However, AFPM generator with non-slotted stator can't generate high voltage at low wind speed due to long air-gap. It is the reason of output efficiency drop. Therefore, in this paper, the AFPM synchronous generator with internal rotor and dual slotted stators for the small wind turbine is studied, and deal with a cogging torque minimization through the determination of optimum pole-arc ratio.
Grounding Characteristics Analysis of the Rod-Type Grounding Electrodes used for Electric Distribution Systems
Kim, Kyung-Chul ; Jung, Ji-Won ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 25, issue 6, 2011, Pages 49~56
DOI : 10.5207/JIEIE.2011.25.6.049
Grounding system insures a reference potential point for electric devices and also provides a low impedance path for fault currents or transient currents in the earth. The ground impedance as function of frequency is necessary for determining its performance since fault currents could contain a wide range of frequencies. In this paper, the grounding resistance, grounding impedance and transient grounding impedance are measured by using 3-point fall-of-potential method in order to analyse grounding characteristics of the copper and concrete rod grounding electrodes. An equivalent transfer function model of the ground impedance and transient grounding impedance are identified from the measured values by using ARMA method and evaluated by comparing the conventional grounding impedance.
Calculation and Mitigation of Magnetic Field Produced by Straight Line-Conductor with Finite Length
Kang, Dae-Ha ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 25, issue 6, 2011, Pages 57~67
DOI : 10.5207/JIEIE.2011.25.6.057
Purpose of this study is to find the mitigation method of magnetic field by finite length multi-conductors such as indoor distribution lines and to be applicable to design of the distribution lines. For this purpose, exact formula about the components
of magnetic field need in case of straight line-conductor with finite length forward any direction. In this study simple formula of the components were deduced and by using these formula magnetic fields for various models of line-configurations were calculated. And also a calculation method of induced currents in conductive shield was presented and using this method, programing of calculation is relatively easy and calculation time is short. The magnetic field after cancellation by these induced currents was calculated. All of calculations were performed by Matlab 7.0 programs. Through the calculation results it could be obtained followings for the mitigation of magnetic fields. The separation between conductors ought to be smaller than smaller as possible. In case of 3-phase, delta configuration is more effective than flat configuration. In case of 3-phase, unbalanced currents ought to be reduced as possible.. In case of more than two circuits of 3-phase, adequate locations of each phase-conductor such as rotating configuration of 3-phase conductors are more effective. The magnetic shielding effect of the conductive shielding sheet is very high.
Analysis of Electric Shock Hazards due to Touch Current According to Soil Resistivity Ratio in Two-layer Earth Model
Lee, Bok-Hee ; Kim, Tae-Ki ; Cho, Yong-Seung ; Choi, Jong-Hyuk ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 25, issue 6, 2011, Pages 68~74
DOI : 10.5207/JIEIE.2011.25.6.068
The touch or step voltages which exist in the vicinity of a grounding electrode are closely related to the earth structure and resistivity and the ground current. The grounding design approach is required to determine the grounding electrode location where the hazardous voltages are minimized. In this paper, in order to propose a method of mitigating the electric shock hazards caused by the ground surface potential rise in the vicinity of a counterpoise, the hazards relevant to touch voltage were evaluated as a function of the soil resistivity ratio
for several practical values of two-layer earth structures. The touch voltage and current on the ground surface just above the test electrode are calculated with CDEGS program. As a consequence, it was found that burying a grounding electrode in the soil with low resistivity is effective to reduce the electric shock hazards. In the case that the bottom layer soil where a counterpoise is buried has lower resistivity than the upper layer soil, when the upper layer soil resistivity is increased, the surface potential is slightly raised, but the current through the human body is reduced with increasing the upper layer soil resistivity because of the greater contact resistance between the earth surface and the feet. The electric shock hazard in the vicinity of grounding electrodes is closely related to soil structure and resistivity and are reduced with increasing the ration of the upper layer resistivity to the bottom layer resistivity in two-layer soil.
A Study on the Cause and Countermeasures of the Short-Circuit Test Failures of the Distribution Transformer
Park, Byung-Rak ; Park, Hoon-Yang ; Shin, Hee-Sang ; Kim, Jae-Chul ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 25, issue 6, 2011, Pages 75~81
DOI : 10.5207/JIEIE.2011.25.6.075
This study aims to research and analyze the cause and countermeasures of the short-circuit test failures of the distribution transformer, which captures failure share at the highest level when carrying out its performance test. For this purpose, the research was done on the basis of 77 failure cases out of 998 tests in total performed by the Korea Electrotechnology Research Institute(KERI) from 2004 to 2010. Based on the research, the paper also includes analysis of the causes of the short-circuit test failures in its early stage of transformer development and proposes its countermeasures accordingly.
Simulation of Reactive Power Compensation in Grid-Connected Wind Power Generation System
Ro, Kyoung-Soo ; Jang, Bo-Kyoung ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 25, issue 6, 2011, Pages 82~89
DOI : 10.5207/JIEIE.2011.25.6.082
Reactive power support is considered to be necessary for dealing with a voltage stability issue with wind turbine system employing squirrel-cage induction generator(SCIG). This paper analyses steady-state characteristics of the SCIG wind turbine system by simulating torque-slip characteristics of SCIG with respect to variations of interconnecting network strength and generator terminal voltage. It also presents dynamics analysis of SCIG wind turbine system on Simulink to investigate the impact of static var compensator(SVC) and static synchronous compensator(STATCOM) on transient stability enhancement. It analysed transient stability with varying fault duration times and compared the transient stability characteristics with varying rated capacities of SVC and STATCOM. It is shown that the STATCOM has a better performance and reactive power support compared to SVC.
A Study on Estimation Method of Outage Cost caused by Vulnerabilities of SCADA System
Kim, Balho-H. ; Kang, Dong-Joo ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 25, issue 6, 2011, Pages 90~99
DOI : 10.5207/JIEIE.2011.25.6.090
As power industry evolves into Smart Grid scheme, previously closed power systems are being integrated into public communication networks. It increases the controllability and efficiency of the system, but also accompanies many cyber threats having existed in the Internet to the SCADA system. Therefore it is required to apply security countermeasures to the Smart Grid, which brings about investment costs. There have been few approaches to assess risks from cyber attack especially in electric power industry. So this paper proposes a methodology to assess quantitative impacts of various types of cyber attacks to a power system, and also shows the feasibility of the method through a case study.
A Study on Grounding Resistance Measurement of Power Supplying Substation using Grounding Current Division Factor and FOP Profile Method
An, Yong-Ho ; Choi, Jong-Ki ; Kim, Yong-Hak ; Han, Jeong-Yeol ; Lee, You-Jin ; Han, Byoung-Sung ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 25, issue 6, 2011, Pages 100~107
DOI : 10.5207/JIEIE.2011.25.6.100
Since transmission and distribution neutral wires are connected with a substation grounding grid, it is very difficult to measure grounding resistance of isolated substation grounding grid after the substation is energized. It is impractical to isolate the grounding grid from other parallel connections such as distribution line neutrals and overhead ground wires for grounding resistance measurement only. In this paper, we proposed and demonstrated a novel measurement method of grounding resistance of isolated substation grounding grid. For this method, grounding current division factor and conventional FOP(Fall-Of-Potential) profiles were measured at power supplying 154[kV] substation. The obtained FOP profile was processed with the measured grounding current division factor to produce the grounding resistance of isolated grounding grid. Simulated FOP profile agreed well with the measured one showing the validity of the proposed method.
A Method for Evaluating Electric Shock Hazards Based on Human Body Current
Lee, Bok-Hee ; Yoo, Yang-Woo ; Choi, Jong-Hyuk ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 25, issue 6, 2011, Pages 108~114
DOI : 10.5207/JIEIE.2011.25.6.108
In order to mitigate the possible hazards from electric shock due to the touch and step voltages, the high resistivity material such as gravel is often spread on the earth's surface in substations. When the grounding electrode is installed in two-layer soil structures, the surface layer soil resistivity is different with the resistivity of the soil contacted with the grounding electrodes. The design of large-sized grounding systems is fundamentally based on assuring safety from dangerous voltages within a grounding grid area. The performance of the grounding system is evaluated by tolerable touch and step voltages. Since the floor surface conditions near equipment to be grounded are changed after a grounding system has been constructed, it may be difficult to determine the tolerable touch and step voltage criteria. In this paper, to propose an accurate and convenient method for evaluating the protective performance of grounding systems, the propriety of the method for evaluating the current flowing through the human body around on a counterpoise buried in two-layer soils is presented. As a result, it is reasonable that the grounding system performance would be evaluated by measuring and analyzing the current flowing through the human body based on dangerous voltages such as the touch or step voltages and the contact resistance between the ground surface and feet.
A Development and Performance Assessment of On-Line Monitoring System for Optical Fiber Composite Underground Distribution Network using DTS
Cho, Jin-Tae ; Kim, Ju-Yong ; Lee, Hak-Ju ; Cho, Hwi-Chang ; Choi, Myeong-Ho ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 25, issue 6, 2011, Pages 115~121
DOI : 10.5207/JIEIE.2011.25.6.115
Intelligent distribution equipment is inevitable to realize self-healing which is one of smart grid functions in distribution network. Therefore, most of distribution equipment have been developed with self diagnostic sensors. However, it is not effective to construct on-line monitoring system for underground distribution cable because of high cost and low sensitivity. Recently, optical fiber composite cable is being considered for communication and power delivery in order to cope with increasing communication in distribution network. This paper presents the design and performance assessment results of underground cable on-line monitoring system using DTS(Distributed Temperature Sensing) and optical fiber composite underground cable.
The Simulation of Single Phase Multi-Level Converter which can control the SOC of Lithium-Ion Battery Units
Kim, Jae-Hong ; Kim, Eel-Hwan ;
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers, volume 25, issue 6, 2011, Pages 122~128
DOI : 10.5207/JIEIE.2011.25.6.122
This paper proposes a new control scheme of lithium ion battery units based on single phase multi-level converter. In the DC/AC converter applications using battery storage system, it is necessary to control the balancing voltage of individual battery units for high efficiency utilization. Using the proposed control scheme, the DC/AC single phase converter system is applied. To verify the effectiveness of the proposed control scheme, computer simulation is accomplished. In the computer simulation, lithium-ion battery units and single phase multi-level converter system are modeled and carried out using Psim simulation program. It will be helpful for design and applications of energy storage system with lithium-ion battery.