• Title, Summary, Keyword: electrical shock

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A Statistical Analysis on the Electric Shocks in 2014 (2014년 감전사고 통계 분석)

  • Hong, Eun-Hee
    • Journal of the Korea Safety Management and Science
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    • v.17 no.4
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    • pp.171-179
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    • 2015
  • As the industrial scale is getting enlarged and the people's quality of life is growing, the electric energy consumption has been rapidly increasing every year and the frequency of electrical accidents such as electrical shock This paper gives statistical analysis of the number of casualties caused by the electrical shock, five hundred people every year, but it still exceeded the shaping risk of electrical accidents to anyone in KOREA. In this paper, for the electrical shock of the in 2014 act by occupation, voltage electrical equipment, location, accident type and months. In order to acquire electrical shock in 2014, we visited police stations and hospitals and analyzed records of accidents. The result showed that the electrical shock alone caused 37 people deaths and 569 injuries.

Mechanical induced electrical failure of shock compressed PZT95/5 ferroelectric ceramics

  • Nie, Hengchang;Yang, Jia;Chen, Xuefeng;Zhang, Fuping;Yu, Yin;Wang, Genshui;Liu, Yusheng;He, Hongliang;Dong, Xianlin
    • Current Applied Physics
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    • v.17 no.4
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    • pp.448-453
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    • 2017
  • A comparative experimental study of shock compressed $Pb_{0.99}(Zr_{0.95}Ti_{0.05})_{0.98}Nb_{0.02}O_3$ (hereafter referred to as PZT95/5) ferroelectric ceramics within different insulation materials were performed in this study. It was found that the insulating materials play a significant role in the electrical failure behavior of PZT95/5 ferroelectric ceramic. The electrical breakdown behavior of PZT95/5 ferroelectric ceramics within epoxy resin was observed to aggravate at low temperature $-55^{\circ}C$. Porous PZT95/5 ferroelectric ceramic was found to exhibit lower failure probability than its dense counterpart. Electrical failure of PZT95/5 ferroelectric ceramics under shock wave was found to be an extrinsic behavior and a tentative explanation was proposed based on the mechanical compressive stress-induced cracks initiation by epoxy resin.

A Study on the Characteristic of Electrical Construction Work for Prevention of Electric Shock Accident (감전재해 예방을 위한 전기공사업의 특성에 관한 연구)

  • Choi, Sang-Won
    • Journal of the Korean Society of Safety
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    • v.29 no.5
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    • pp.29-34
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    • 2014
  • The live line working is inherently dangerous as the workers have to work under the risk of electrical shock and most of works are carried out at height. The live line working need the some specific techniques and higher level safety measures such as a risk assessment to carry out works safely, but the electrical construction companies performed live-line working are usually small-sized companies. They have less capacity to have own safety management system. This study intended to conduct an in-depth analysis on the cause of electric shock accidents to provide basic data for policy proposing taking into considering the past eleven years for a long-term plan. And 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, moreover, co-relation of the electrical work order form and on safety workings, especially electrical construction company/work.

Electric Shock Risk Assessment of the Human Body and Potential Distribution Analysis by FLUX3D in a Public Bathtub (공중욕조에서의 FLUX3D에 의한 전위분포 해석 및 인체의 전격위험성 평가)

  • Kim, Doo-Hyun;Kim, Sung-Chul;Lee, Jong-Ho;Kim, Han-Sang;Kim, Chong-Min
    • Journal of the Korean Society of Safety
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    • v.22 no.2
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    • pp.41-46
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    • 2007
  • This paper considers the electrical shock risk of the human body due to underwater leakage current in such places of public baths. Many submerged electric facilities in a public bath may create a severe electric shock hazard for the human body, since wet body in an accidentally energized bathtub can result in low electrical resistance through the human body for leakage or fault currents. Therefore a major consideration, in the context of electrical safety underwater, is the shock risk to the bather as a result of electric current flowing through the water in bathtub. To assess the electric shock risk and to analyze the potential distribution in a bathtub, 2 different situation cases are set up, then experimental and simulation methods are adopted. The validity of 2 cases of simulation and experiment data in a bathtub for electric distribution underwater are compared and analyzed. Also electric shock risk assessment underwater in a real public bathtub by simulation program package, Flux 3D, was conducted herein, and the results are presented and discussed.

The Characteristics of Electric Shock Accidents and Their Countermeasures for Portable Electrical Tools (이동형 전기기기의 감전재해 특성 및 그 대책)

  • Choi, Sang-Won
    • Journal of the Korean Society of Safety
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    • v.32 no.2
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    • pp.21-26
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    • 2017
  • According to the data of Korea Occupational Safety and Health Agency, electric shock accidents during recent 11 years exceeded more than 60% in architecture/other and construction work, the countermeasures for safety are required in the harsh environment of a construction site where moving electric machines and equipments are widely used. The establishment of countermeasure for insulation degradation and defect is required, in consideration of increasing trend for accidents caused by defective insulation among low voltage electrical installation each year. The aim of this study is to propose the policy about portable electrical tool standards and/or worker's safety standards for preventing electric shock accidents on safety workings, and is to develop the technology and the safety device to prevent electric shock for accident prevention reduction through experiments. It obtained the followings through this study; statistical data analysis of late about 10 years of electric shock-related industrial accidents analysis and portable electric tools; safety device development of 'device for testing continuous grounding and power shut-down' to prevent electric shock from portable electric tools. Furthermore, developed results and proposal in this study will help to prevent the electric shock accidents from portable electric tools and will be expected the utilization of policy formulation, educational data and field supplement of the safety device, and etc.

Receiver Protection from Electrical Shock in Vehicle Wireless Charging Environments

  • Park, Taejun;Hwang, Kwang-il
    • Journal of Information Processing Systems
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    • v.16 no.3
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    • pp.677-687
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    • 2020
  • This paper deals with the electrical shock that can occur in a car wireless charging system. The recently released the Wireless Power Consortium (WPC) standard specifies that the receiver must be protected from the radio power generated by the transmitter and presents two scenarios in which the receiver may be subjected to electrical shock due to the wireless power generated by the transmitter. The WPC also provides a hardware approach for blocking the wireless power generated by the transmitter to protect the receiver in each situation. In addition, it presents the hardware constraints that must be applied to the transmitter and the parameters that must be constrained by the software. In this paper, we analyze the results of the electric shock in the vehicle using the WPC certified transmitter and receiver in the scenarios presented by WPC. As a result, we found that all the scenarios had electrical shocks on the receiver, which could have a significant impact on the receiver circuitry. Therefore, we propose wireless power transfer limit (WPTL) algorithm to protect receiver circuitry in various vehicle charging environments.

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.

A Study on the Roadmap Design for Electrical Safety Technology (전기안전기술 로드맵 설계 연구)

  • Shin, Heung-Sik;Lee, Jae-Chon;Lee, Bung-Gil
    • Journal of the Korea Safety Management and Science
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    • v.9 no.3
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    • pp.1-7
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    • 2007
  • A roadmap for Electrical Safety Technology has been designed based on the study that has been contributed by the specialists, professors and researchers in electral safety field. The roadmap is divided into five major fields including, for instance, the electrical fire accidents roadmap. The other four roadmaps are for electrical shock accidents, electrical facilities accidents, electrical safety policies and electrical safety culture-education, respectively. Each roadmap has a purpose, a scope, and a technical characteristic. Following the roadmaps can result in significant reduction of electrical fire accidents, electrical shock accident victims and so forth. The result can also be utilized in guiding the planning and development of the future electrical safety technology.

Design of Knee-Pelvis Joint in the Biped Robot for Shock Reduction and Gravity Compensation (충격 감소 및 중력 보상을 위한 이족보행로봇의 무릎-골반 관절 설계)

  • Kim, Young-Min;Kim, Yong-Tae
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.1
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    • pp.136-142
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    • 2015
  • In the paper, a design method of knee and pelvis joint in the biped robot is proposed for shock absorption and gravity compensation. Similarly to the human's body, the knee joints of the biped robot support most body weight and get a shock from the landing motion of the foot on the floor. The torque of joint motor is also increased sharply to keep the balance of the robot. Knee and pelvis joints with the spring are designed to compensate the gravity force and reduce the contact shock of the robot. To verify the efficiency of the proposed design method, we develope a biped robot with the joint mechanism using springs. At first, we experiment with the developed robot on the static motions such as the bent-knee posture both without load and with load on the flat ground, and the balance posture on the incline plane. The current of knee joint is measured to analyze the impact force and energy consumption of the joint motors. Also, we observe the motor current of knee and pelvis joints for the walking motion of the biped robot. The current responses of joint motors show that the proposed method has an effect on shock reduction and gravity compensation, and improve the energy efficiency of walking motions for the biped robot.

A Study on the In-depth Analysis of Cause and Characteristic for Recent Electric Shock Accident (최근 감전재해의 발생특성과 재해원인 분석연구)

  • Choi, Sang-Won
    • Journal of the Korean Society of Safety
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    • v.29 no.2
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    • pp.7-11
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    • 2014
  • The electric shock victims were predominantly male, and more than half of the victims were found in companies with less than five employees in terms of the scale of company, and also more than half of victims had less than one month of experience for work experience. Considering the category of industry, more than half of the victims were engaged in construction, and considering the subcategory of industries, more than 60% of electric shock victims were found in building and other construction works. This study intended to conduct an in-depth analysis on the cause of electric shock accidents to provide basic data for policy proposing taking into considering the characteristics such as the electric shock path, low voltage, grounding and protection of workers. Also this study conducted an in-depth analysis of electric shock accidents for the past eleven years taking into account the necessity of a long-term plan.