• Title/Summary/Keyword: Low voltage handhole

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Analysis of Electric Shock Accidents and Check Results in Domestic and Foreign low-Voltage Handhole (국내.외 저압지중함 감전사고사례 및 점검결과의 분석)

  • Kim, Chong-Min;Han, Woon-Ki;Bang, Sun-Bae;Kim, Han-Sang;Shim, Keon-Bo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.22 no.1
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    • pp.124-131
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    • 2008
  • Recently underground electrical power distribution is increased because people attach importance to aesthetics of the downtown areas. Lew-voltage handhole of underground distribution line for joint and branch point is mainly installed at the sidewalk. So, pedestrian can get a electric shock if fault is occurred in the low-voltage handhole. Furthermore the street was flooded by recently an unusual change in the weather. Fault is occurred in the low-voltage handhole that may create a shock hazard for the human body because a person's body resistance lower due to effect of water. This paper analyses causes of electric shock accidents and check results at the low-voltage handhole. At a result of analysis, the causes of electric shock accidents in domestic and foreign low-voltage handhole are same but environmental conditions of low-voltage handhole are different In the future, the analytical data can be applied to prevent the electric shock at the low-voltage handhole, and can be used to basic data for the improving installment of low-voltage handhole.

Countermeasures for Preventing Electric Shock in Low-Voltage Handhole (저압 지중함에서 감전사고 방지를 위한 대책연구)

  • Kim, Chong-Min;Han, Woon-Ki;Bang, Sun-Bae;Kim, Han-Sang
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.56 no.4
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    • pp.195-200
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    • 2007
  • This paper describes the countermeasures for preventing the electric shock which can be occurred in the low-voltage handhole underwater. Low-voltage handholes were designed and made for the test in the testing field. Which were installed 4 cases. a metal handhole cover was employed in case 1; FRP(Fiber glass Reinforced Plastic) handhole cover in case 2; an insulated rubber was put on the joint of the cables in case 3; the exposed conductors(cover, frame etc) were commoned and grounded in case 4. Thus, an ground potential near the low-voltage handhole was measured and evaluated quantitatively for the 4 cases. The measured results show that the potential of case 2.3 were lower than that of case 1 because the insulated rubber and the FRP cover prevented direct contact to the fault point. The case 4 is the lowest among the 4 cases because the common and grounding helps the fault current release into the ground, which makes the ground potential rise lower. As a result, although each case has the defects, these ways can effectively lower the electric shock risk in the low-voltage handhole.

Development of connection device for underground low voltage cable of manhole and handhole (맨홀용 및 핸드홀용 지중 저압케이블 접속장치 개발)

  • Lee, K.J.;Lee, E.J.;Joo, J.M.;Yu, K.Y.
    • Proceedings of the KIEE Conference
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    • 2005.07b
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    • pp.1056-1058
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    • 2005
  • It shows a tendency to increase rapidly underground of the city due to the build up of the large residential districts with industrial development, so there is required the development of the connection device for underground low voltage cable with high quality & convenient for use with consideration for installation condition of the underground. Hence, We will have the development of the connection device for underground low voltage cable, which is made waterproof perfectly under the flood of the underground for the long time, is convenient for use in spite of narrow area such as manhole or handhole, and can be able to prevent the release by the vibration.

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Design and Implementation of Remote Monitoring System for Underground Low Voltage Handhole Using Zigbee Communication (지그비 통신을 이용한 지중저압접속함 원격 모니터링 시스템 설계 및 구현)

  • Weon, La-Kyoung
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.18 no.3
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    • pp.58-67
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    • 2019
  • The low-voltage connection box used as a low-voltage transmission line of KEPCO is intended to branch or connect to an underground line. In comparison with the utility considering the aesthetics of the distance, and safety measures are needed. In this paper, temperature and humidity, $CO_2$, water level, acceleration, and vibration sensor are installed inside the underground low voltage handhole, and the sensor data is transmitted to the ground using the Zigbee module. Antenna (Bolted Antenna) for communication with the ground was proposed and the data reception through it was confirmed. In the LF mode and the HEX mode, the transmitted data was confirmed to be a perfect reception success rate. In the case of the bolted antenna, the difference between the ground state and the underwater state was observed as a result of the experiment in the environmental environment. However, It was judged that reception sensitivity was sufficient for communication. The received data could be confirmed through PC based GUI.

The analysis of checking results and electric shock accident happens at domestic and foreign low-voltage handhole (국내외 저압지중함의 감전사고 및 점검결과 분석)

  • Kim, Han-Sang;Bang, Sun-Bae;Kim, Chong-Min;Han, Woon-Ki
    • Proceedings of the KIEE Conference
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    • 2007.04b
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    • pp.91-94
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    • 2007
  • The increased use of underground power distribution as opposed to overhead lines contributes to the aesthetics of the downtown areas. But there is an inherent risk of accidental electrocution should there be damage to the insulation of the cable because of heavy rain. Should a pedestrian make contact with this cable indirectly, via a man hole cover, electrocution could result. In this paper, we analyse electrical shock accident and checking results in this low-voltage handhole.

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electrical shock accident prevention method and risk assesment as grounding type on the low-voltage handhole using PSCAD/EMTDC (PSCAD/EMTDC를 이용한 지중함 접지방법에 따른 전격위험성 평가와 감전사고 예방대책)

  • Han, Woon-Ki;Kim, Jong-Min;Bang, Sun-Bae;Jung, Jin-Soo;Jung, Jong-Woo;Lee, Jun
    • Proceedings of the KIEE Conference
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    • 2008.07a
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    • pp.2204-2205
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    • 2008
  • 2005년도에 저압 지중함에서 감전사고가 발생한 후 감전예방을 위한 다양한 개선대책이 현장에 적용되었다. 사고발생 직후에는 지중전선의 접속부에 테이핑처리에 의한 보완조치가 적용되었으며, 그 이후 전선 접속 부를 방수형접속재로 교체하는 작업이 시행되었으며 전선 접속부 위를 감전방지용 절연고무판으로 덮거나 차량의 통행이 없는 일부 지중함의 뚜껑을 절연재질인 고강도플라스틱(FRP)으로 교체하거나 그 이외에 다중접지된 중성선과 지중함의 틀을 본딩하는 개선대책 등이 현장에 적용되었다. 이러한 다양한 개선대책은 지중함에서의 감전사고를 예방하기 위한 것으로 그중 틀접지는 이미 적용된 지중함 내의 접지설비와 중성선이 공통접속된 상태에서 지중함과 맞닿는 틀에 접지도체를 연결하는 것이다. 계통의 중성선을 이용한(TN-C)방식의 틀접지는 효과가 있으나 뚜껑부분의 진동방지를 위하여 삽입한 고무패킹은 성능저하를 일으키므로 그에 대한 대책이 필요하였다.

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