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.

에너지 절감을 위한 공공청사의 스마트 조명제어 시나리오 제안 -지방청사를 중심으로- Proposal of Smart Lighting Control Scenarios for Public Offices for Energy Saving -Focused on Local Government Offices-

Younjoo Cho ; Anseop Choi

To reduce greenhouse gas emissions, public offices are obligated to certify zero-energy buildings and implement a system for energy use efficiency. In the case of the lighting sector, the focus is on expanding the application of LED fixtures to improve energy efficiency, but additional energy savings are possible by applying the smart lighting control method. Therefore, in this study, empirical cases for government offices were reviewed among the Green Proving Ground(GPG) programs of the General Services Administration(GSA) that evaluated the energy saving effects of various smart lighting control methods. In addition, International Energy Conservation Code(IECC), ASHRAE 90.1, and Building Energy Efficiency Standards-Title 24, which provide specific and detailed regulations for smart lighting, were reviewed. Based on this, smart lighting control scenarios for energy saving in local government offices were proposed in consideration of the user’s characteristics and occupancy type.

외부환경 변화를 고려한 A형 접지극의 매설깊이 기준 연구 Study on Depth of A-Class Earth Electrode Considering the External Environment Change

Songhee Cha ; Kihwan Ryu ; Yong-Seong Kim ; Geum-Hwan Lee ; KuHyun Cho ; Seong-su Shin

The purpose of this paper is to study on depth of A-Class earth electrode for maintaining the earthing resistance of electrical installation. IEC, BS, NEC, NESC were investigated and compared with KEC regulation, for soil temperature (freezing or frostline), earth potential, and moisture effect (drying). Furthermore, we demonstrate the effect of water and temperature on the depth of the earth electrode was tested. In addition, the effect on moisture and temperature according to the depth of the earth electrode was tested. Based on the result of this study, it is intended to derive the depth of the earth electrode that is safe and reliable in electrical installations.

재생에너지 연계를 위한 배전계통 수학적 모델링에 관한 연구 A Study on the Mathematical Modeling of Distribution System for Renewable Energy Sources

Moonjeong Lee ; Myungseok Yoon ; Sungyun Choi

Recently, the ratio of renewable energy sources in the distribution system has been increased in order to address the problems of environmental pollution and fossil fuel depletion. However, the growth of renewable energy sources in the distribution system can cause various issues such as load unbalance, reverse power flow and power system instability. Therefore, in this paper, mathematical modeling of main components of distribution system was performed in both the frequency domain and the time domain. The results of mathematical modeling were verified by using MATLAB/Simulink and OpenDSS.

A형 산업용 누전차단기의 원치 않는 차단원인 Cause of the Unwanted Tripping of Type-A Circuit-Breaker Incorporating Residual Current Protection for Industrial Uses (CBR)

Hae-Sup Shim

The objective of this study is to identify the reason why unwanted type-A CBR tripping occurs at under 15㎃ which is the residual non-operating current of the CBR. All the nuisance trippings happened at around 13㎃ on an effective value with a few harmonic currents. Determining the cause, to begin with, the real residual operating currents of the tripped CBRs have been tested. Second, trends of the residual currents including temporary residual currents (TRC) and instantaneous residual currents (IRC) have been measured for twenty days. Then, the results have been compared with other non- tripping circuits. Lastly, the power qualities measured at the tripping circuit have been analyzed to ascertain some relationships between fluctuation of residual currents and power qualities. Upon conclusion of the study, it was assumed that the cause of inadvertent trippings was TRC added to permanent residual currents with a modest value over 13 ㎃ already present for several reasons. The measured maximum peak to peak value of TRC, which was simultaneous with the permanent residual current, was 279㎃. Last but not least, compared to other studies regarding the unwanted CBR tripping, there was little relationship between the fluctuation of residual currents and power qualities, at least in this study.

전력설비 특허 동향 분석 및 부상기술 동향에 대한 고찰 Electric Power Facility Patent Trend Analysis and a Study on Emerging Technology Trends

SangHo Park ; Byung-Chul Choi ; Hong-Woo Lim

The electric power facility industry were started with all transmission and distribution devices, from power plants that produce electricity to consumers who use electricity. Major domestic power companies are concentrating on decarbonization, decentralization, digitalization, deregulation, and energy democratization as the policy direction to implement the decarbonization strategy. Although it seems a bit complicated, the reality is that the strategy of increasing the proportion of new and renewable power generation through the expansion of new and renewable business is the main issue. Therefore, as the main DC power source of renewable energy sources is connected to the transmission and distribution system, it is expected that the investment related to the safe system operation and DC facility will continue to increase. In this regard, the renewable and DC-related power facility industry is also expected to grow together. In this paper, based on patent information, the recent patent trends in the electric power facility field of IP5 countries in the United States, Europe, Japan, China, and Korea were analyzed quantitative and qualitative, respectively. The emerging technology trends were analyzed through activity and technology index analysis.

경계조건과 형태 기반으로 구성된 5개 와이어웨이시스템의 진동대 실험을 통한 내진성능 검증 Seismic Performance Evaluation of 5 Different Wireway-pulley System Subjected to Shaking Table Test

Su-Min Jin ; Han Van Tran ; Sung Chan Kim ; Jiuk Shin ; Kihak Lee

This paper presents the results of an experimental seismic investigation performed on prototypes made of a pulley-wireway system with four different boundary conditions and an existing lighting structure support, a one-way system, through a tri-axial shaking table test. The attention of this study focused on evaluating the seismic qualification of the prototypes based on ICC-ES AC 156. In particular, the influence of the mounting position of prototypes at the ceiling, steel frames, walls, and beam or column on the seismic response of the building was also discussed in detail. The seismic performance in terms of acceleration and displacement response was also evaluated by power spectral density-based (PSD), and root mean square-based (RMS), which showed a better seismic response of H-beam frame type than other types of pulley-type wireway system. Finally, it was determined that the newly developed lighting support with the addition of a pulley is capable of dissipating seismic energy more effectively than the previous lighting equipment system.

대용량 부유식 해상풍력발전단지의 연계선로 거리에 따른 경제성 분석 Economic Analysis of Large-scale Floating Offshore Wind Farm Considering Transmission Line Distance to Shore

Won-Sik Moon ; Mi-Young Kim

In this study, economic evaluation of large-scale floating offshore wind farms(OWF) is conducted. The floating wind turbine is not limited by water depth, so it can be installed in the sea far from the coast, and also expected to increase the productivity of electricity energy due to higher mean wind speed. As the cost of the project increases as the distance to shore increases and the capacity of the power generation complex increases. However, as the distance to shore increases and the capacity of the offshore wind farm increases, the project cost will be increased. Therefore this research is needed to confirm whether it is economically sustainable. The case models to be evaluated are a 400㎿ and 480㎿ wind farm. The cost model is composed of the installation and operating cost of the floating offshore wind farm. In particular, the electricity production and income are calculated by applying the wind speed model according to the transmission line distance and the electricity energy price according to the renewable energy certificate(REC) weight. Economic analysis is evaluated on annual energy production(AEP), net present value(NPV), cost-benefit ratio(B/C ratio), and levelized cost of energy(LCOE).