• 제목/요약/키워드: Dangerous Voltage

검색결과 51건 처리시간 0.026초

분수대에서의 전기설비 고장에 대한 누전 감지 장치 개발 (Development of Leakage Detector for Electric Equipment Failure in Fountain)

  • 김두현;김성철;박종영
    • 한국안전학회지
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    • 제33권1호
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    • pp.35-40
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    • 2018
  • This research aimed to develop an leakage detector of analyzing the electric potential generated from the electric leakage of electric equipment of the fountain. To accomplish this goal, the potential gradient was analyzed against path 1 ~ path 4; this was done by taking the lighting of a fountain as the electric leakage point based on code analyses in Korea and other countries. Lighting 1 was taken as the electric leakage point, and the earthing point was set against lightings(2~3). It appeared that the allowable touch voltage against the 1 type(under 2.5 V) exceeded 60.0%. Therefore, the lighting of fountain turned out to be the most dangerous point, and electric shock could be formed by the electric leakage of electric equipment in underwater as well as by the lighting. An leakage detector was developed based on this risk; this detector is capable of analyzing the electric potential of a electric equipments of the fountain in underwater. Then, a verification test was carried out. This leakage detector can be used to measure electric potential in various submerged areas such as swimming pools, flooded spaces, and fountains.

TN-C-S계통에서 PEN도체 단선이 인체안전에 미치는 영향 (Personnel Safety Related to Disconnection of PEN Conductor in TN-C-S System)

  • 김정철;이규선;이복희
    • 조명전기설비학회논문지
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    • 제26권5호
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    • pp.58-64
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    • 2012
  • In electric power supply systems, an earthing system determines the electric potential of the conductors related to that of the Earth's surface. The choice of earthing system has implications for the safety of the power supply systems. There are considerably different regulations for earthing (grounding) systems in each country. A protective earth(PE) conductor ensures that all exposed conductive surfaces are at the same electric potential as the earth surface. This paper deals with that when PEN conductor of TN-C-S system is disconnected, dangerous touch voltage causes personnel body to be harmed and human being's property to be damaged seriously. For this reason, this paper explains how serious problems can occur when the fault current flows. As a consequence, we can understand how we can design earthing system properly to ensure the personnel safety against earth faults. The result shows the way that TN-C-S system can be applied safely in Korea.

전력선로 점검용 생체모방형 드론에 관한 기술적 실현가능성 연구 (Technical Feasibility Study on the Biomimetic Drone for Inspection of Electric Power Lines)

  • 박준영;이재경;김석태
    • KEPCO Journal on Electric Power and Energy
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    • 제2권4호
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    • pp.543-548
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    • 2016
  • Live-line maintenance for electric power lines is very dangerous because of their ultra-high voltage environments and the risks of falling from heights. Recently, drone technology has been spotlighted due to its maneuverability and stable controllability, and has been being applied to maintenance works in the electric power industry. This paper presents a new type of drone that can be transformable by introducing biomimetics to its mechanism and can run on an overhead ground wire as well as it can fly. Its technical feasibility was confirmed through experiments.

TN-C-S계통에서 PEN도체 단선이 인체안전에 미치는 영향 (Personnel safety related to a loss of PEN conductor in TN-C-S system)

  • 김정철;이복희;이규선;조정현
    • 한국조명전기설비학회:학술대회논문집
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    • 한국조명전기설비학회 2009년도 추계학술대회 논문집
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    • pp.59-62
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    • 2009
  • In electrical power supply systems, an earthing system determines the electrical potential of the conductors relative to that of the Earth's conductive surface. The choice of earthing system has implications for the safety of the power supply. Note that regulations for earthing (grounding) systems vary considerably among different countries. A protective earth(PE) connection ensures that all exposed conductive surfaces are at the same electrical potential as the surface of the Earth, This paper investigates that when PEN conductor of TN-C-S system is disconnected, dangerous touch voltage is caused at personnel body. According to this paper, we can understand that when TN-C-S system is applied in Korea, what we should set up to ensure the personnel safety from fault current.

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가로등의 지중전로 손상으로 인한 인체감전 위험성에 대한 실험 연구 (Human Experimental Studies on the Risk of Electric Shock due to Damage of Underground Wire in Street Lamp)

  • 정재희
    • 한국안전학회지
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    • 제24권5호
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    • pp.6-12
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    • 2009
  • This study performed an experiment for the danger of an electric shock in the human body, which is directly touched or approached to the exposure of buried metals in a leak caused by certain ground faults at a buried cable in street lamp. In the results of the experiment, the dangerous of electric shocks due to the earth specific resistance and wet and submersion of the earth surface represents a high level as the human body is directly touched to the buried metal at a leak point. In addition, it can be seen that the safety of the human body is influenced by the earth specific resistance, separated distance from buried metals, and shape of buried metals at around the leak point.

인터넷을 이용한 용접에 대한 연구 (A study on welding by using internet)

  • 강성구;나석주
    • 대한용접접합학회:학술대회논문집
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    • 대한용접접합학회 2000년도 특별강연 및 춘계학술발표대회 개요집
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    • pp.310-312
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    • 2000
  • In welding, there is much dangerous element. Workers who are exposed to working field of welding may be infected with industrial diseases. To solve these problems, many studies has been carried out. It is a good method to make welding automation in the distance and internet makes it possible. If internet is used, welding can be carried out without the limitation of time and place. On this study, welding by using internet is studied. By using internet, computer which has interface with welding machine is connected to computer in the distance and welding is carried out with the signal of computer in the distance. Basically the connection of computers is made by two program-Server and client windows program-which have functions which are needed for control of XYZ table and welding machine. Through these program, the motion of welding torch which was mounted on XYZ table, the starting and ending of welding is controlled and monitored with a camera. Also, signal-welding current and arc voltage-is measured and displayed.

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을지로 3가 지하철 ESS를 모의한 ESS 화재에서 Cell Balancing이 미치는 영향성 분석 (Analysis of the Cell Balancing Effect on the ESS Fire by Simulating the Euljiro 3-ga Subway ESS)

  • 윤상선;기석철
    • 전력전자학회논문지
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    • 제25권3호
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    • pp.219-226
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    • 2020
  • Given the change in the energy market, large energy storage systems (ESS) is rapidly entering the market. In this rapid spread, fire accidents are becoming an issue. This study attempts to approach the fire from the system point of view to analyze the problems caused by bonding from different perspectives. Moreover, to conduct this study, the fabrication of real objects is dangerous, which needs to be verified through simulation. In this study, we approach the cause of fire that occurs in large-capacity ESS from the system perspective. We focus on determining the effects of cell balancing performed on the BMS after charging. Thus, we analyze the cell balancing behavior and the linkage risks to the various stacks. The study also explores why no fire occurs during 70% operation.

고주파 플라즈마 시스템에 의안 디젤기관의 배기가스 특성 (The Characteristics of Exhaust Gas in Diesel Engine by High Frequency Plasma-EGR System)

  • 박재윤;정장근;김종석;하현진
    • 조명전기설비학회논문지
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    • 제19권5호
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    • pp.109-113
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    • 2005
  • 자동차에서 발생되어지는 NOx, Soot 그리고 기타 배출 가스는 대기오염의 주요한 원인물질이다. 그래서 많은 나라에서 이를 점점 더 엄격하게 규제하고 있는 실정이다. 본 논문에서는 디젤 엔진에서 발생되어진 NO, Soot 그리고 CO를 고주파 플라즈마 시스템을 이용하여 제거특성을 연구 하였다. 전반적으로 유해 물질들이 전압이 증가함에 따라 그 제거특성이 우수하게 나타났다.

수중에서의 감전 메카니즘 특성에 관한 연구 (A Study on the Characteristic of Electric-Shock Mechanism in the Water)

  • 도범성
    • 한국방재학회 논문집
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    • 제7권5호
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    • pp.111-118
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    • 2007
  • 최근에 들어와 가로등에 의한 감전사고가 지속적으로 발생하고 있다. 특히 집중호우로 인해 가로등이 침수될 경우 누전에 의한 감전 사고는 매우 높다. 전기감전사고가 발생할 경우 사고전압을 분석해 보면 주로 220V의 저압시설물에서 발생되고 있으나 이에 대한 위험성을 충분히 인식하지 못하고 있는 실정이다. 가로등 시설물의 사용전압 220V는 주로 일반인이 쉽게 접촉할 수 있는 도로변에 시설되어 있기 때문에 감전사고의 위험성은 매우 높은 편이다. 그러나 가로등 침수로 인해 누전이 발생했을 경우 누전체에서의 거리변화에 따른 수중전위분포가 인체에 미치는 영향을 연구하는 사례는 미약한 실정이다. 본 논문에서는 수중에서 누전이 발생했을 경우에 인체에 미치는 영향과 수중전위분포를 분석하고 수중에서 누전체와의 거리 및 깊이에 따른 변화가 어떻게 인체에 영향을 주는지 실험을 통하여 감전경로와 감전메카니즘을 비교 분석하고자 한다.

보조접지그리드의 시설에 의한 대지표면전위경도의 저감 (Reduction of the the Ground Surface Potential Gradients by Installing Auxiliary Grounding Grids)

  • 이승칠;엄주홍;이복희;김효진
    • 조명전기설비학회논문지
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    • 제16권2호
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    • pp.121-129
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    • 2002
  • 본 논문에서는 효과적인 접지그리드 설치기법에 대하여 기술하였으며, 낙뢰나 지락고장서지, 개폐서지 등으로 부터 인체의 감전보호나 컴퓨터를 비롯한 전기·전자기기의 보호를 위한 접지그리드의 시설 및 배치방법에 따른 실험적인 평가를 수행하였다. 접지그리드의 배치에 따른 대지표면전위경도의 분석과 위험전압으로 작용하는 대지 표면전위상승의 억제에 주안점을 두고 실험용 모델접지전극을 시설한 후 임 펄스전류를 인가하였다. 기존의 등간격 접지그리드의 결점을 보완하기 위해 접지그리드에 경사를 가지는 보조접지그리드를 시설하였으며, 보조접지그리드를 시설한 접지시스템에서는 인체나 전기·전자기기에 위험전압으로 작용하는 대지표면전위경도를 최대 50%이상 완화시키는 효과를 얻었다.