Mobile QR Code QR CODE : Journal of the Korean Institute of Illuminating and Electrical Installation Engineers

Journal of the Korean Institute of Illuminating and Electrical Installation Engineers

ISO Journal TitleJ Korean Inst. IIIum. Electr. Install. Eng.

대향차량의 상향등에 의한 눈부심이 고령운전자의 안전한 전방 곡선부 진입을 위해 요구되는 노면휘도 수준에 미치는 영향 The Effects of Glare caused by Oncoming High-beam Light on Road Surface Luminance Levels Required for Safe Entry into the Forward Horizontal Curved Section in Elderly Drivers)

Won-Bum Cho

The purpose of this study was to analyse the effects of glare caused by the oncoming high-beam light, which many drivers cite as a factor that makes driving difficult on the night road, on the safety of drivers entering the curved part of the night road. To this end, the study conducted a virtual road test on the elderly subjects, and as a result, based on the possibility of securing the perception-response distance required by elderly drivers to safely respond to the appearance of forward horizontal curved section, it identified the appropriate road luminance level depending on the driver's ratio to secure the required perception-response distance. According to the analysis, the higher the surface luminance, the further the perception-response process required to respond to the appearance of the forward horizontal curved section can be completed, and the margin from the end of the perception-response process to the starting point of the curved section is analyzed to have the relationship of natural logarithm function. In addition, it was analyzed that the critical road surface luminance of about 3.3 times the safety level based on 75% of the safety level and 2.4 times the safety level 85% of the safety level is required when affected by the high-beam light of the opposing vehicle.

MATLAB/Simulink를 이용한 분산전원 연계 배전선로 전압조정용 스마트 인버터 모델링 Smart Inverter Modeling for Voltage Regulation in Distribution Lines with Distributed Generations using MATLAB/Simulink

Yun-Sik Oh

In this paper, a smart inverter model for voltage regulation in distribution lines which has been paid attention as a feasible solution on voltage rise due to interconnection of large amount of distributed generations (DGs) is developed. Typical functions including Volt-Var and Volt-Watt control are implemented by using MATLAB/Simulink and inverter average model based on controllable 3-phase current source is utilized in the smart inverter model. Performance of the model implemented is verified by considering various conditions and it is confirmed that this model can effectively solve overvoltage problem at point of common coupling (PCC) in case of distribution system with large amount of DGs.

이산화 바나듐 2단자 소자 기반 전압 유도 발진의 소자 규모에 따른 온도와 압력 반응 분석 Analysis on Temperature and Pressure Responses of Voltage-Induced Oscillation Based on Vanadium Dioxide Two-Terminal Device According to Device Dimensio

Min Seok Kim ; Yong Wook Lee

In this paper, we analyzed the temperature and pressure responses of voltage-induced oscillation created in a two-terminal device based on a vanadium dioxide (VO2) thin film for three devices with different dimensions. The voltage-induced oscillation can be generated by connecting a VO2-based two-terminal device, an external resistor, and a DC power supply in series, and the waveform of the oscillation varies by changes in the ambient temperature and pressure. The temperature and pressure responses of this oscillation were investigated by using two oscillation waveform parameters such as the oscillation frequency (fo) and the oscillation amplitude (Ao). The three devices used for the dimension analysis, designated as Devices I, II, and III, were fabricated to have a fixed electrode separation of 10μm and current channel widths of 3, 5, and 10μm, respectively. The temperature- and pressure-induced variations of the oscillation waveforms (fo and Ao) were observed for the three VO2 devices (Devices I, II, and III). If the measured responses of fo and Ao are linear and independent with each other, temperature and pressure changes applied to the device can be separately measured. Also, through the device dimension analysis, it is concluded that the initial values of the parameters (fo and Ao) can be adjusted in the separate measurement of temperature and pressure by controlling the current channel width of the device.

케이블의 배열형태에 따른 화재 위험성에 관한 연구 A Study on the Fire Risk According to the Cable Arrangement

Sin-Dong Kang ; Jae-Ho Kim

In this study, the thermal and flame propagation characteristics of cable in perforated cable tray used in a low voltage indoor distribution line were analyzed according to the arrangement of the cable using Light PVC sheathed circular cord(VCTF) cable. A thermocouple was attached to the inside and outside of the cable to measure the temperature. The cables were arranged in vertical and horizontal directions and, layered in triangular and rectangular shapes. As compared to the temperature inside a single cable, the temperatures increased when numerous cable were arranged in a horizontal direction and layered in triangular and rectangular shapes. The temperature inside the cables reached a peak of 305 ˚C when the current was twice the allowable current. At allowable current, the temperature increased to 62˚C when the cables were layered in a rectangular shape. This was close to the maximum permissible temperature for VCTF cable(i.e., 70 ˚C). The insulation resistance of the VCTF cable declined dramatically in accordance with increases in temperature, which not only raised the risk of short circuit and ground faults but also accelerated the cable deterioration. The flame propagated at a velocity of 2.7 cm/sec in the vertical direction and 0.95 cm/sec in the horizontal direction at twice the allowable current. The faster propagation velocity in the vertical direction was due to the characteristics of flame and plume, which moved in an upward direction due to a buoyancy effect.

변전소의 재생에너지 모니터링을 위한 동기페이저 시스템 구축 Establishment of Synchro-phasor System for Renewable Energy Monitoring of Substatio

Kyung-Min Lee ; Daeyun Kwon ; Chul-Won Park

Renewable energy sources such as PV and wind power have uncertainty and volatility, so measures must be taken to expand the acceptance of renewable energy sources. Time synchro-phasor technology is useful for real-time monitoring and protection control of renewable energy source linked power grid. In this paper, we construct a local renewable energy monitoring and operation system using GPS (Global Position System) based time-synchronized PMU (Phasor Measurement Unit) and F/R (Fault Recorder) in substation. We introduce the GPS based time synchronizing phasor theory and standard, and then describe PMU and F/R based real-time monitoring system built in substation. Finally, we discuss the monitoring and analysis using real-time data collected.

임베디드 모듈과 PCM을 이용한 배터리보호장치 개발 Development of Battery Protection Unit using Embedded Module and PCM)

Tae-Hoon Jeong ; Ju-Yong Kim

Recently, electrical energy storage system(ESS) have been used in a wide range of applications, for example, in connection with renewable energy (Photovoltaic power generation, wind power generation, etc.) to improve energy efficiency, frequency regulation and power stabilization. Also, mobile devices such as portable IT devices (smart phones, notebooks, smart mobility, etc.) demand is rapidly increasing. As a result, the supply of battery energy storage system(BESS) based on lithium batteries also rapidly increasing. In addition to that fire accidents have been increasing due to complex problems such as ESS management, poor operation and inadequate installation environment. In this paper, protection circuit module(PCM) and battery management system(BMS) of battery energy storage module(BESM) in BESS has contemplated. In connection with the common problem of thermal runaway of battery management, the safety enhancement for thermal stability is simulated through temperature sensing for individual cells. To this end, embedded-based multi-channel temperature monitoring compensates the limitation of temperature monitoring has battery protection devices(PCM and BMS etc.). Also, to overcome the problem of rapidly the battery life aging due to over-voltage and under-voltage protection of transient range based on PCM, we propose a BMS using embedded module and PCM with module level voltage & current management function.

태양광발전시스템에서 수직배열 어레이의 발전 전력량 분석에 관한 연구 A Study on the Generating Power Analysis of Vertical Array in Photovoltaic System

Jong-Bok Park

In the array installation method of photovoltaic power generation system, horizontal array has higher power generation efficiency but its site utilization rate is lower at 30 to 40%. On the contrary, the vertical array has the advantage of providing site utilization rate of 100% or more depending on the number of vertical arrays. In this study, the silicon-based crystalline modules with power generation efficiency of 16.9% were arranged vertically in 8 series and 8 parallel arrays to produce 10kW scale. The vertical array was placed in the outer part where foreign matters such as fine dust is naturally washed away by the rain and the amount of power generation was analyzed in consideration of the inclination angle, azimuth and the shadow length at the meridian altitude that affect the power generation amount. As a result of the analysis, the tilt angle of the array installation in the vertical alignment in the latitude of 35°~37° was proposed through simulation.

조명 및 전기설비 부착 모듈형 미세먼지 집진기의 PDMS 필름 효과성 분석에 관한 연구 A Study on Analysis of the Effectiveness of PDMS Film of a Modular Particulate Matter Collector attached to Lighting and Electrical Equipment

Ju-Hyun Jeon

Recently, various application devices, such as air purifiers and ventilation equipment for the reduction of particulate matters occurring indoors as well as outdoors have been commercialized and utilized. However, as it is necessary to enhance the performance compared to the existing application devices with the deterioration of the rapidly changing atmospheric environment and the increase of the occurrence of particulate matters, problems of high specifications and high costs occur. This study is concerned with a performance test of a modular particulate matter collector designed and adopted to effectively resolve the issue of particulate matters. This study produced Polydimethylsiloxane (PDMS) film, a dust collecting part as an expansion of research on the modular particulate matter collectors designed previously and conducted an analysis of the effectiveness of the particulate matter collection performance of the produced film. Through an analysis of the effectiveness of the PDMS film, this study would reduce costs and implement a high-quality modular particulate matter collector.