• Title/Summary/Keyword: Lighting Protection System

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Study of Efficiency Test and Subjective Responses about Pendent Task Lighting System Using Phosphor Luminescent Film LED (광기여 필름 LED 팬던트 작업조명시스템 주관평가와 성능검증)

  • Cha, Kwang-Seok;Kim, Hway-Suh
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.23 no.3
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    • pp.188-193
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    • 2011
  • For a long time work or study, pendent task lighting system prepared with phosphor luminescent film LED was developed for eye protection and working efficiency improvement. Developed lighting system was used together with pendent and ambient lighting. Such as, we made comfortable lighting environment system. Evaluation for developed lighting system, that had proceeded to Mock-up test and subjective evaluation. Also It had proceeded that lighting environment analyzed and compatibility valuation of installation. In subjective evaluation, the students have expressed themselves satisfied to phosphor luminescent film LED lighting system. In Mock-up test, It is not problem to intensity of illumination, luminance and color temperature. Therefore, developed LED lighting system was installed at the Daegu apartment. It is having a P.O.E study progress to phosphor luminescent film LED lighting system.

A Study on the Electrical and Thermal Safety of System LED Lighting (시스템 LED 조명의 전기적·열적 안전성 확보 방안에 대한 연구)

  • Kim, Yeong Woo;Kim, Chung Hyeok;Choi, Woon Shik
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.33 no.5
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    • pp.418-426
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    • 2020
  • This study tested the electrical, structural, and thermal safety of LED lighting products, available on the market. Five recessed LED systems, 20 W each, and five fixed LED systems, 25 W each, were selected. Dielectric strength tests, live part electric shock protection tests, and thermal tests were conducted on the LEDs. These were key tests for user safety, according to the specification of the safety criteria for electric products, KC 60598-1, South Korea. In addition, the wiring temperature of UL1007, 60227 IEC 08, and UTP cables, was measured. The results of the study gave an in-depth examination of the safety of LED lighting systems for users.

Wet Flashover Characteristics and Reform Measure of a Conventional Lightning Rod against Lightning Impulse Voltages (뇌임펄스전압에 대한 돌침형 피뢰침의 주수섬락특성과 개선 방안)

  • 이복희;강석만;엄주홍;이승칠;김승지
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.16 no.3
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    • pp.93-100
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    • 2002
  • In this paper, in ordor to examine the relevant technical facts which are very instructive to revise the domestic standard for lightning protection systems, standards and technical guideline for the protection of structure against lightning were reviewed, and several issues of the domestic standards were experimentally investigated. As a consequence, the insulator of relatively low implse voltage and a large percentage of lighting rods is flashovered by relatively low impulse voltage and a lage percentage of lighting current flows through supporting mast. Thus the potential gradient in the vicinity of supporter for lighting rods is extremely increased and the role of lighting propection systems is nullified. It seems obvious that the flashover of insular supporting lighting rod can range from erratic operation of microelectronic devices to minor physical ham or even death, or costly damage electrical equipment.

Insulation Design Standards for Protection of Power System against Lightning in Korea Electric Power Corporation (낙뢰로부터 전력설비 보호를 위한 한전의 절연설계 기준)

  • Woo, J.W.;Moon, J.D.
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.55 no.12
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    • pp.555-560
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    • 2006
  • As it has been reported that more than 60% of transmission line faults occurs due to lightning strokes, lighting is one of concerned issues in electric power utility company. Most of transmission line is double circuit in Korea. Double circuit outages account for 33.7 percent of total lightning faults from 1996 to 2004. Even though transmission fault might be cleared shortly by protective system, it could deteriorate the power quality accompanied with sag or flicker. Moreover, double circuit fault may lead to more aggravated situation, for instance, blackout. To Protect transmission lines from lightning stroke, reduction of tower footing resistance, multiple ground wires and unbalanced insulation in double circuit lines have been adopted. In this paper, we would like to introduce insulation design standards for lightning protection of Korea Electric Power Corporation.

A Study on the Development of Fire Alarm System with Evacuation Lighting and Voice Alarm Functions (피난조명 및 음성경보 기능을 내장한 화재경보시스템 개발에 관한 연구)

  • Lee, Gun-Ho;Choi, Su-Gil;Kim, Si-Kuk
    • Fire Science and Engineering
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    • v.32 no.4
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    • pp.25-34
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    • 2018
  • This study investigated the development of a fire alarm system with evacuation lighting and voice alarm functions. The performance of a fire detector and system with independently built-in evacuation lighting and voice alarm functions was confirmed for early recognition of fire and to allow visibility of the evacuation route in the event of fire. This new system satisfied model recognition and product testing technological standards with 1.62 lx average illumination, 89.7 dB average sound and 86.1 dB average voice. From additionally testing the evacuation performance of this new system, it was confirmed that the evacuation time decreased by 63.08% to 67.82% under the experimental conditions compared to conventional systems. The new system can minimize fire damage by setting off voice alarms to prevent failure of fire recognition and by flashing emergency lighting to secure the minimum required visibility range for evacuation. Therefore, it is considered that it will be utilized as a fire alarm system with appropriateness and usefulness by considering people with hearing or visual impairment.

A Study on establishing countermeasures to security threats due to the introduction of information protection system. (정보보호시스템도입에 따른 보안위협요소 대응방안수립에 관한 연구)

  • Kyung, ji-hun;Jung, Sung-Jae;Bae, Yu-Mi;Sung, Kyung
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2013.05a
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    • pp.693-696
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    • 2013
  • Information protection system (Information protection system)-based IT environment built popularity in public agencies and businesses take advantage of the resources for the integration of the information system one essential environment began to recognize, cloud systems (Cloud System), cloud security (Cloud Security), big data (Big Data), big data security (Big Data Security), industrial security (Security Industry), as well as the issue. Due to the influence of these information protection system (Information protection system) in response to my external security threats based on the analysis plan. In this paper, data protection systems (Information protection system), resulting in the introduction, there are a number of security threats and particularly industrial security aspects and internal and external security threats in response by lighting about aspects of the plan is based on knowledge.

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A study on present status and improvement of protection relay system in subway station for stable power supply (지하철 역사의 안정적 전원공급을 위한 보호시스템 검토)

  • Na, Jong-Woo;Jo, Won-Kang;Park, Dong-Seon;Yoo, Yeon-Seong;Moon, Hwa-Soo
    • Proceedings of the KSR Conference
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    • 2008.06a
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    • pp.433-444
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    • 2008
  • Nowadays, subway station has provided not only transportation but living spaces for everyday activities. Therefore, a variety of facilities have been installed for a safety of citizens such as fire-fighting equipment, platform screen doors and giving high level of benefits such as air-conditioning and heating equipment, escalators, lighting apparatus. In order to operate these facilities appropriately, it is needless to say that electric power supply must be reliable. Many protection relays have been installed to protect electric apparatus and power system, nevertheless it..s study has been insufficient in the concrete. From this paper, through analyzing of protection relay system of electric room operated in line 2 of Seoul metro, we can help to improve stable power supply system of subway station.

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Lightning Protection of Signalling Equipments at Subway Car Depot by Equi-potential Bonding (지하철 차량기지에서의 등전위 본딩에 의한 신호시스템 낙뢰보호대책)

  • Seo, Seog-Chul;Choi, Kyu-Hyoung
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.1
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    • pp.100-105
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    • 2007
  • Signalling equipments at railroad sites are widely exposed to high voltage lightning surges. This paper presents a lightning protection system for the signalling equipments at subway car depots. The main features of the system are as follows : (1)the common grounding system between power system grounds and the signaling system grounds, (2)physical and chemical methods to reduce grounding resistivity, (3)rearrangement of lightning rods based on the rolling bal1 theory, (4)equi-potential bonding networks to minimize the potential differences between the equipments grounds. The system has been constructed at six subway car depots in Seoul metropolitan area and it is measured that the grounding resistivity are reduced to 0.266 ohms and the potential differences between devices are reduced to a negligible quantity. After the construction of the systems, it has not been reported the break-down of the signalling equipments caused by lighting surges.

A Study on Analysis of Complex Heat Sink System for High Efficiency LED Thermal Effect (고효율 LED 방열효과 증대를 위한 융합형 Heat Sink 장치 방열 해석)

  • Kang, Chang-Soo;Kang, Ki-Sung
    • 전자공학회논문지 IE
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    • v.48 no.2
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    • pp.12-18
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    • 2011
  • In this paper, did numerical simulation to confirm LED module for lighting and protection against heat special quality of heat sink device. Analysis was gone dividing on case that emitting light side turns normalcy department considering that eat of device according to usage and case that turn down looking being street lamp of 200 W or security appointment lighting device analysis case, and also, volume of thermal element divides on big case and small case and analyzed. Confirmed that can do so that may discharge LED's thermal value to outside enough in analysis wave and current heat sink shape, and investigated that difference of protection against heat performance according to position of device and size of thermal element appears.

Seoul World Cup Stadium Electric Plan (서울월드컵경기장 전기설계)

  • 최용민
    • Journal of the Korean Professional Engineers Association
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    • v.34 no.5
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    • pp.40-43
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    • 2001
  • In order for the World cup football game to be operated stably with duplicate service electric power supply, It is done, emergency generator and the U.P.S it establishes. the electric power system power control, lighting control, integrated monitoring. rue fighting. obstruction light, the searchlight, snow melting, electric erosion shield. grounding, the lightening protection and viewable lighting, stadium floodlight and an electric bulletin board it composed of the back which it sells.

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