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.

전기화재 감소를 위한 아크차단기 도입에 관한 연구 A Study on the Installation of the Arc-Fault Circuit Interrupters for Preventing Electric Fires

Kheongyong Park ; Eungchan Na ; Minho Shin ; Herie Park ; Dong-Young Lim

This paper proposes the installation of arc-fault circuit interrupters to prevent the electric fires caused by the electric arc. In spite of the positive effects on the installation of arc-fault circuit interrupters, the interrupters have not been required as mandatory apparatus because of the lack of standards for their installation, test, validation, and institutions. To propose the mandatory installation of the apparatus, this paper deals with the regulations for the installation and requirements of the arc-fault circuit interrupter applied in different countries, including the United States, Canada, the European Union, Germany, the United Kingdom, and Asian countries. The necessity of the installation of the arc-fault circuit interrupter is proposed based on domestic regulations. The direction of the enactment and revision of the regulations are also reviewed. As a result, the definition of the arc-fault circuit interrupter, establishment of testing and certification standards, and obligation of the installation of the arc-fault circuit interrupters are suggested for preventing electric fires.

상대계수법을 이용한 설 연휴에 대한 단기 전력수요예측 알고리즘 Short-Term Load Forecasting Algorithm for Lunar New Year’s Holidays Using the Relative Coefficient Method

Bo-Sung Kwon ; Chan-Ho Moon ; Kyung-Bin Song

An algorithm to improve the accuracy of short-term load forecasting(STLF) for the Lunar New Year’s Holidays is proposed. The proposed algorithm can integrate the impact of temperature and behind-the-meter(BTM) solar PV generation on the load for the Lunar New Year’s Holidays. The hourly loads for the Lunar New Year’s Holidays are forecasted using the relative coefficient method. The sensitivity of load to temperature is calculated, and the corrected loads using the calculated sensitivity are used to load forecast. In addition, the impact of BTM solar PV generation is integrated into the load forecast for the Lunar New Year’s Holidays using the reconstituted load method. Test results of load forecasts for the Lunar New Year’s Holidays from 2016 to 2020 have shown that the accuracy of load forecasting improves when the impacts of temperature and BTM solar PV generation are systematically considered in load forecasting.

배전계통 정전복구 연구를 위한 연동 시뮬레이션 환경 구축 Establishment of Co-Simulation Environment for Distribution Network Restoration Studies

Yun-Sik Oh

Faults of components on distribution networks result in electricity interruptions for all loads downstream of a faulty zone since distribution networks have been generally operated in radial structures due to simple design, low cost, and simple protection coordination. To restore the outage loads in the healthy areas, service restoration should be taken by using normally open switches to transfer the loads to other feeders. This paper proposes a co-simulation environment for service restoration studies composed of sub-simulation tools, OpenDSS and MATLAB, which enables distribution network modeling, power flow analysis, constraints check, generating service restoration candidates, etc. Multiple case studies on IEEE 37-node system are conducted under the proposed simulation environment in order to verify its performance and it is shown that the proposed environment is effective for the service restoration studies.

리튬이차전지 기반 에너지저장장치(ESS)의 화재와 열폭주 억제 기술에 대한 고찰 A Study on Thermal Runaway Suppression Technology in Abnormal State for Energy Storage System(ESS) Using Lithium Secondary Battery

SangHo Park ; Julgi Kang ; Whanug Kim ; Hong-Woo Lim

A lithium ion battery is an energy storage device that the electrical energy into chemical energy through a charging reaction and then uses electricity through a discharging reaction. Although this technology has been commercialized as a power source for portable electronic devices, its range of use is expanding from several tens of kWh to MWh-class power sources such as electric vehicles(EVs) and energy storage systems (ESS). Currently, it is widely used in battery energy storage systems (BESS) can be used for a variety of applications, including frequency regulation, demand response, integration of renewable energy, and microgrids, respectively. The ESS industry has rapidly expanded its supply through various support policies such as special electricity rate discounts(KEPCO) and renewable energy supply certificates(REC). Simultaneously with the expansion of ESS installation, a total of 29 fires have occurred since the first ESS fire in August 2017. Therefore, in this paper, the ignition mechanism of lithium-ion batteries was analyzed based on the current status of ESS fires in Korea and the results of the investigation. In addition, it is intended to present a method for securing cell-level safety by securing thermal runaway suppression technology by improving the thermal stability of the electrolyte and separator constituting the lithium-ion battery.

전기설비 무정전 진단기술 안전기준 선정 및 Test-bed 구축에 관한 연구 A Study on the Selection of Safety Standards for Uninterruptible Diagnostic Technology for Electrical Equipment and Establishment of a Test-bed

Jae-Yoon Lee ; Il-Rea Noh ; Il-Moo Lee

Electrical safety accidents in multi-use and energy-concentrated facilities accompany any property loss and human casualties being increased in large scale. Therefore, the research on aging diagnosis and replacement/individual work technology is being actively ongoing. Currently, safety diagnosis focusing on power off-line diagnosis can only check the status of insulation and rating of each facility, which is different from the actual operating condition. This paper describes the technical methodologies and implementations such as uninterruptible diagnostic technology, electrical equipment diagnostic data, safety standard selection, and test-bed establishment neccessary for AI live diagnosis system using big data from IoT sensors other than power off-line diagnosis. Based on this, we would like to suggest a guideline for stable power supply and maintenance to apply the preventive diagnosis system for electrical equipment.

사물인터넷(IoT)를 이용하여 시간과 공간적 제약 없이 원격 제어 가능한 전동 창호 시스템 개발 연구 Research on the Development of the Electric Window System that can be Remotely Controlled without Time and Spatial Restrictions Using the Internet of Things(IoT)

Gye-Ho Hwang ; Bong-Seob Lee

The house we live in and the window system of the house have the purpose of protecting users from the natural environment. Protecting oneself from others according to the social change of the increase in single-person households, In order to meet the needs of users for convenience and quality of life improvement, there is a demand for an electric window system that responds to an emergency situation of indoor air quality improvement and harmful gas leakage in an indoor environment. In this study, we propose a function that enables the user to remotely control the window system without spatial and temporal restrictions by realizing the automatic opening and closing function of the window system in the house using IoT remotely even in emergency situations and normal times. To make it feasible, the field applicability of the proposed system was presented through circuit configuration, design, manufacturing, and testing. The proposed system is characterized in that the size of the proposed system is reduced to be applied to the actual field, and A/S convenience is also considered by applying a linear transfer module to increase the ease of installation. In the future, it is thought that additional research is needed to release it as a standardized product to increase the possibility of actual field application.

1kV, 1kA, 12kW 펄스 출력을 위한 Discharge Closing Switch의 스너버 회로 설계 Snubber Circuit Design of Discharge Closing Switch for Pulse of 1kV, 1kA, 12kW

Min-Kyu Choi ; Seung-Ho Song ; Hong-Je Ryoo

This paper deals with the overall structure of 1kV, 1kA, and 12kW pulse modulator and the snubber circuit design of the discharge closing switch for pulse. This high-voltage, high-current pulse modulator is used in various fields such as the field of printed electronics. However, overshoot and noise are unavoidable considerations due to the features of pulse power that instantaneously outputs high voltage and current. To reduce such overshoot and noise, a snubber circuit has been proposed. The snubber circuit consists of a resistance, capacitor, diode(RCD) and is additionally equipped with one more capacitor. Therefore, in this paper, we analyze the operational principles of the proposed snubber circuit. Finally, a waveform without overshoot and malfunction was confirmed through a pulse output experiment.