• 제목/요약/키워드: Electrical Shock

검색결과 405건 처리시간 0.026초

건설업에서의 감전재해 감소 방안을 위한 연구 (A Study on the Decreasing Method of Electric Shock Accident in the Construction Industry)

  • 최상원
    • 한국안전학회지
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    • 제29권3호
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    • pp.28-33
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    • 2014
  • Regarding the characteristics of fatal electric shock accident during the past 10 years, fatalities occurred more frequently in July & August, and AM 10-12 PM & 14-16. Also, the electric shock accident is occurred more frequently in the age group from 30 to 40. Especially, the fatal electric shock accident in construction industry covered more than half of total industry. Therefore, it is strongly requested for the protection technology of an electric shock from the low voltage electric path, grounding method and workers. The aim of this study is to propose the policy about the equipment performance standards and/or worker's safety standards to revise the standards for preventing electric shock accidents on safety workings.

수중 전격 과도현상 해석을 위한 ATPDraw 시뮬레이션 (ATPDraw Simulation for Transient Phenomena Analysis of Electrical Shock Underwater)

  • 정종욱;정진수
    • 조명전기설비학회논문지
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    • 제21권6호
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    • pp.48-54
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    • 2007
  • 본 논문에서는 전자과도현상 해석 프로그램인 ATPDraw를 이용한 사례연구로써 인체에 전격이 가해지는 순간의 과도현상을 해석하였다. 사례연구를 위한 2가지 전격 모델은 최악의 환경을 조성하고자 수중에서 발생하는 것으로 가정하였으며, 첫째, 인체가 수중에서 전원설비의 노출 충전부에 접촉하였을 경우와 둘째, 인체의 수족이 수중에서 동시에 대지에 접촉하는 경우를 모델링하였다. 모델링 후 각 사례에 대해 인체의 각 부위에서의 계산된 전압, 전류를 비교하여 전격 순간의 과도현상을 해석하였다. 첫 번째 모델에 대한 해석 결과, 인체가 수중 노출충전부에 촉수시 순간적인 과도현상이 발생하며, 이때의 전압, 전류는 촉수 전후보다 현저히 증가되는 것을 확인하였다. 그러나 이 현상은 지속시간이 매우 짧아 통전전류와 시간의 적이 안전한계 이내임을 감안할 때, 수용가의 상용전압에서의 전격의 영향은 그다지 크지 않을 것으로 사료된다. 두 번째 모델에서는 인체의 수족이 대지에 동시에 접촉했을 경우, 접촉 순간 인체에 유기되는 전압의 크기는 전반적으로 감소되었으나, 가슴 부위를 통과하는 전류량이 급증하였다. 그러나 그 크기가 작고 지속시간이 짧아 인체에 미치는 전격의 영향은 미미할 것으로 사료된다. 결국 두 경우 모두 전압의 크기, 인체 임피던스에 따라 전격의 영향이 좌우될 것으로 판단된다.

누전차단기의 트립 동작시간 분석을 통한 전류·시간적(積) 개선 (Improvement of Circuit-Time Product through Analysis of Operating Time of Earth Leakage Circuit-Breakers)

  • 김주철;이상중
    • 조명전기설비학회논문지
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    • 제26권12호
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    • pp.44-49
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    • 2012
  • The earth leakage circuit-breakers installed to protect the human body against electrical shock have conventionally had a sensitivity current of 30 mA and an operating time of 30 ms or less. No reviews are found, however, on the operating time of the current conducting through the human body due to the electrical shock or ground fault. This paper measures the trip-operating time against the earth leakage under the condition of increased current as well as under the condition of rated sensitivity current of the earth leakage circuit-breakers. Further measurement with a prototype model showed an improved operating time of 16 ms or less under the condition of rated sensitivity current. It is expected that development of circuit-breakers with higher safety is possible if the performance of the electronic circuit can be improved.

IEC60479 인체 임피던스 모델에 근거한 직류누설전류의 특성 및 검출 알고리즘 (Detection Algorithm and Characteristics on DC Residual Current based on Analysis of IEC60479 Impedance Model for Human Body)

  • 김용중;이진성;김효성
    • 전력전자학회논문지
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    • 제23권5호
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    • pp.305-312
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    • 2018
  • DC distribution systems has recently taken the spotlight. Concerns over human safety and stability facility are raised in DC distribution systems. Std. IEC 60479 provides basic guidance on "the effects of shock current on human beings and livestock" for use in the establishment of electrical safety requirements and suggests an electrical impedance of the human body. This study analyzes impedance spectrums based on the electrical equivalent impedance circuit for the human body; human body impedances measured by experiments are analyzed below the fundamental frequency (60 Hz). The analysis shows that the equivalent impedance circuit for the human body should be modified at least in low-frequency range below the fundamental frequency (60 Hz). The DC residual current detection method that can classify electric shock accidents of humans and electric leakages of facilities is proposed by applying the analysis result. The detection method is verified by experiments on livestock.

고주파 방사에 의한 루프형 구조물에서의 유도전압 특성 (Characteristics of Induced Voltage in Loop Structures from High-frequency Radiation Antenna)

  • 최상원;권혁면
    • 한국안전학회지
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    • 제27권5호
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    • pp.49-54
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    • 2012
  • There is a possibility that electrical sparks may occur at discontinuities in metallic structures from distance of close to high power radio/radar transmitters. Voltage may be induced on these metallic structures by the radio-frequency transmitter. In this case, a person who comes into contact with these structure may be undergone a severe electrical shock. In this paper, assessment of the electrical shock and ignition hazards was investigated through experimental which are consisted radio transmitter and metallic loop-type structure in shield room. We measured that the induced voltage was highest at 61 MHz of transmission frequency, and confirmed the possibility of electric shock and explosion induced by a voltage or spark. But it is needed additional research where is opened site.

ARM Cortex 기반의 AED simulator 플랫폼 개발에 대한 연구 (A Study on the ARM Cortex-based AED simulator platform development)

  • 김정래;이은종;정익주
    • 산업기술연구
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    • 제35권
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    • pp.15-21
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    • 2015
  • In this paper, we implemented a high performance automated external defibrillator(AED) simulator that has various characteristics of virtual simulated patient(VSP) to verify important operations and functions of the AED. To verify the AED in various environment, the AED simulator should have the characteristics of VSP and can analyze the characteristics of electrical shock rhythm. In this paper, the implemented simulator has twenty seven electrocardiogram scenarios and we showed the implemented simulator has less error rate than conventional simulator in analyzing electrical shock rhythm.

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침수 상용전원에 의한 감전위험성 검토 (A Study on the Electric Shock due to Submerged Power Source)

  • 정종욱;정진수
    • 조명전기설비학회논문지
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    • 제21권6호
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    • pp.71-76
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    • 2007
  • 본 논문에서는 상용전원이 침수되었을 경우, 이에 의한 인체 감전의 위험성을 실증실험을 통해 검토하였다. 실험을 위해 한쪽 벽면에 노출된 충전부가 설치된 모의수조를 구축하고 내부에 도전성 수용액을 채운 후, 전원으로부터의 거리, 방향, 도전성 수용액의 전도율 및 수위에 따른 전위를 측정하였다. 실험 결과 수중에 설치된 전원장치로 인한 전위분포는 거리에 따라 달라지지만, 침수 수용액의 도전율, 노출된 충전부로부터의 각도 및 측정높이는 전기적으로 미치는 영향이 거의 없음이 확인되었다.

Sn-3Ag-0.5Cu계 솔더를 이용한 자동차 전장 부품 접합부의 열충격 특성에 관한 연구 (A Study of Thermal Shock Characteristics on the Joints of Automotive Application Component using Sn-3Ag-0.5Cu Solder)

  • 전유재;손선익;김도석;신영의
    • 한국전기전자재료학회논문지
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    • 제23권8호
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    • pp.611-616
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    • 2010
  • This study investigated the characteristics of fracture behavior and mode on solder joints before and after thermal shock test for automotive application component using Sn-3.0Ag-0.5Cu solder, which has a outstanding property as lead-free solder. The shear strength was decreased with thermal cycle number, after 432 cycles of thermal shock test. In addition, fracture mode was verified to ductile, brittle fracture and base materials fracture such as different kind fractured mode using SEM and EDS. Before the thermal shock, the fractured mode was found to typical ductile fracture in solder layer. After thermal shock test, especially, Ag was found on fractured portion as roughest surface. Moreover, it occurred delamination between a PCB and a Cu land. Before thermal shock test, most of fractured mode in solder layer has dimples by ductile fracture. However, after thermal shock test, the fractured mode became a combination of ductile and brittle fracture, and it also could find that the fracture behavior varied including delamination between substrate and Cu land.

친환경자동차의 전기안전을 위한 절연저항 측정에 관한 연구 (A Study on the Insulation Resistance Measurement Technique for Electrical Safety of Green Car)

  • 이기연;김동욱;김향곤;문현욱
    • 전기학회논문지P
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    • 제58권4호
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    • pp.597-601
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    • 2009
  • Green car such as a hybrid electrical vehicle and fuel cell vehicle is developed as a commercial target. UN/ECE/WP29 is developing GTR of HFCV and establishing the regulation and standard of electrical safety by ELSA. The regulation and standard about Electrical safety of vehicle are prescribed in ISO, UN/ECE, FMVSS, Japanese Attachment and so on, in case of insulation resistance is referred to keep more than 100/Vdc, 500/Vac. However, accurate method to measure insulation resistance agreeable to structure of vehicle does not exist now, it is actually that correctness of measurement drops according to the feature of battery and fuel cell stack. In this paper, the method to measure insulation resistance for protection against electrical shock by direct contact or indirect contact in Green Car will be indicated by making a comparison between the insulation measurement in standard of electrical safety and the experiment results for HEV and HFCV.

직류환경에서 인체에 흐르는 감전전류 분석 (Analysis on Electric Shock Current in DC Electricity)

  • 이진성;김효성
    • 전력전자학회논문지
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    • 제21권3호
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    • pp.254-259
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    • 2016
  • Recently, DC distribution systems have become a hot issue because of the increase in digital loads and DC generation systems according to the expansion of renewable energy technologies. To obtain the practical usage of DC electricity, safety should be guaranteed. The main concerns for safety are twofold: one side is human protection against electric shocks, and the other is facility protection from short faults. "Effects of current on human beings and livestock" (IEC 60479) defines a human body impedance model in electric shock conditions that consists of resistive components and capacitive components. Although the human body impedance model properly works in AC electricity, it does not well match with the electric shock behavior in DC electricity. In this study, the contradiction of the human body impedance model defined by IEC 60479 in case of DC electricity is shown through experiments for the human body. From the analysis of experimental results, a novel unified human body impedance model in electric shock conditions is proposed. This model consists of resistive components, capacitive components, and an inductance component. The proposed human impedance model matches well for AC and DC electricity environments in simulation and experiment.