• Title/Summary/Keyword: electric shock

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A Study on the Theoretical Analysis of Human Body Approximation to Special High Voltage Eletric Lines (특별고압 전선로에 대한 인체접근한계의 이론적연구)

  • 김상렬;김찬오;이재인
    • Journal of the Korean Society of Safety
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    • v.5 no.3
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    • pp.44-50
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    • 1990
  • This study is conducted to examine the theoretical background of characteristics for electric shock encountered in special high-voltage electric lines among the accidents of electric shock, and to calculate applied current to human body and field strength over the head by means of numerical anaysis through FEM(Finite Element Method), and to make clear the hazard level to the human body, and to establish the approach limit distance of human body to the electric lines, which could be applied to the safety standard while working in the vicinity of special high-voltage electric lines.

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A Study on the Dropping Shock of Household Electric Appliances during Materials Handling (가전제품의 하역 중 낙하충격에 관한 연구)

  • Lee, Soo-Keun
    • KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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    • v.6 no.1
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    • pp.37-40
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    • 2000
  • This study was carried out to investigate dropping shock of household electric appliances during materials handling. Microwave oven($18{\ell}$), TV(16") and washing machine(6.2kg) were singled out as the study items. From the results of dropping test by KS A 1026(General Rules of Performance Testing for Packaged Freights), relative equations were gained as follow : y=0.0863x+10.032 for microwave oven, y=0.136x+7.85 for TV and y=0.214x+5.8 for washing machine (where y is G-factor and x is Dropping height). The maximum values of dropping shock during materials handling were measured to be $11{\sim}14G$ for microwave oven, $12{\sim}15G$ for TV and $10{\sim}12G$ for washing machine. The maximum shocks of microwave oven, TV and washing machine during materials handling were corresponding to dropping shocks of dropping height 45.98cm, 52.57cm and 28.97cm by KS A 1026.

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Analysis on Voltage Rise of Rail in High speed Railway System (고속철도 시스템의 레일 전위 상승 해석)

  • 이종우
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.52 no.8
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    • pp.481-485
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    • 2003
  • In electric railway system, potential of rail has been risen, for return-current flows through rail. The magnitude of rising voltage is different to railway feed system, ground admittance of rail and the load current. If rising voltage of rail is large, electric shock can be occurred to passengers and maintenance- worker, In this paper, we estimate the rising voltage of rail in high speed railway system and check the safety to human beings.

A Study on the Electric Shock Characteristics Using a Human Body Model (인체모델을 이용한 감전특성에 관한 연구)

  • Jung, Yeon-Ha;Lee, Jae-Wha;Jang, Tae-Jun;Roh, Young-Su;Kwak, Hee-Ro;Choi, Chung-Seog
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2004.05a
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    • pp.277-280
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    • 2004
  • As electric shock accident take place frequently, electrical safety is extremely important to prevent them. This paper describes the characteristics of electric shock. In order to examine it, an experimental apparatus including a model of a human body is fabricated and the magnitude of the voltage held by the model is measured under several conditions as follows;(1) the model is not contacted to an electric pole and a step voltage does not exist. (2) the model is not contacted to an electric pole and a step voltage exists. (3) the model is contacted to an electric pole and a step voltage does not exist (4) the model is contacted to an electric pole and a step voltage exists. As a result of the experiment it is found that the voltage held by the model depends on the step voltage as well as the voltages applied to the electric pole.

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Field-Dependent Characteristics of ER Shock Damper (ER 유체를 이용한 충격절연 댐퍼의 특성 연구)

  • 송현정;최승복;김재환;김경수
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2001.05a
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    • pp.109-114
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    • 2001
  • This paper presents field-dependent dynamic characteristics of a shock damper featuring an electro-rheological(ER) damper. A cylindrical type of the shock damper is designed and manufactured on the basis of the field-dependent Bingham model. The damping force is then measured with respect to the piston velocity at various electric fields. The measured damping force is incorporated with the 1DOF shock system to analyze the shock isolation performance.

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

  • Chung, Jae-Hee
    • Journal of the Korean Society of Safety
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    • v.24 no.5
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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.

Induction of Mutation of Streptomyces and Yeast by Simultaneous Treatment of Electric Shock and Chemical Mutagen N-Methyl-N'-Nitrosoguanidine (전기충격과 화학적 돌연변이원 N-Methyl-N'-Nitro-N-Nitrosoguanidine의 병행처리에 의한 방선균과 효모의 돌연변이 유발)

  • Sun, Jong-Ho;Kim, Jung-Hee;Park, Uhn-Mee;Kim, Keun
    • Korean Journal of Microbiology
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    • v.33 no.3
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    • pp.199-202
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    • 1997
  • The effect of electric shock (AC 38 Vll.3 cm) on the lethal effect and induction rate of mutation of chemical mutagen N-methyl-N'-nitro-N-nitrosoguanidine (NTG) was examined by using the spores of Streptomyces and the cells of haploid and polyploid yeast strains of Saccharomyccrs. Spores of Sireptomyces were all alive after 180 min of electric shock, hut all dead after 960 min-treatment. When the spores of Streptomyces or the cells of haploid and polyploid yeast were treated with electric shock and NTG, the electric shock increased the lethal effect of NTG; the survival rate of Streptomyces dropped from 72 to 48% after 180 min-treatment and those of haploidand polyploid-yeast decreased from 8 to 3% and 25 to lo%, respectively, after 40 min-treatment. The electric shock also increased mutation rates of Streptomyces and haploid yeast. from 1.8 to 13.6%' after 120 min-treatment and from 2.4 to 4.8% after 40 min-treatment, respectively.

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Development of Electroconductive Paints for Electric-Shock on Human Body Using Carbon Black (카본블랙을 이용한 인체감전용 전도성 도료의 개발)

  • Kang, Kae-Myung
    • Korean Journal of Materials Research
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    • v.18 no.12
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    • pp.683-688
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    • 2008
  • For development of a human body model for electric shock, electroconductive paints with carbon black as a filler material were developed. The characteristics of the volume resistivities of thin films fabricated using the electroconductive paints were investigated as a function of the particle sizes and content of carbon black. With a carbon black particle size over $80\;{\mu}m$, agglomeration of carbon black powders was observed. The volume resistivity of the particles increased as the porosity increased and as the amount of carbon black decreased due to the agglomeration of carbon black powders. With a particle size of $4\;{\mu}m$ and $20\;{\mu}m$, agglomeration of carbon black powders was not observed and their porosities were measured as 0.86% and 1.12% with volume resistivities of $20\;{\Omega}{\cdot}cm$ and $80\;{\Omega}{\cdot}cm$ respectively. A carbon black particle size of less than $20\;{\mu}m$ is considered to be suitable as a type of electric-shock electroconductive paint for a human body model.

Protection Techniques Against Electric Shock in Low Voltage DC Grounding Systems Depending on the Analysis of Earth Fault Current Paths (저압직류 접지시스템의 지락경로 흐름 분석에 따른 감전 보호기법)

  • Kim, Dong-Woo;Lim, Young-Bea;Lee, Sang-Ick;Choi, Myeong-Il;Moon, Hyun-Wook
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.1
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    • pp.232-238
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    • 2016
  • This paper presents protection techniques against electric shock in low voltage DC(direct current) grounding systems depending on the analysis of earth fault current paths. Firstly, the comparison between alternating current and direct current on human was conducted, and current threshold values for each current path and for long duration were analyzed. Secondly, the analyses of the earth fault current flows were performed depending on the grounding types and earth fault conditions. Lastly, based on these analyses, adequate protection measures of electric shock depending on low voltage DC grounding types were provided.