• Title/Summary/Keyword: Electrical Accidents

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전문가시스템에 의한 전선착설예측 (Export System Approach for Snow Accretion on Transmission Lines)

  • 최규형
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1992년도 하계학술대회 논문집 A
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    • pp.193-195
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    • 1992
  • Snow accretion on transmission lines may cause critical accidents such as sleet jump, tower collpases, etc,. In order to assist power system operators to prevent thses accidents, aprototype expert system had been developed. The system has basic functions of forecasting snow accretion on transmission lines and making a list of all feasible and effective deicing countermeasures. The knowledge of the effect of weather conditions on the snow accretion process continue main rule base. Simulation results show that the proposed system is very promising.

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지중송전계통에서 절연접속함 위치 및 접지방식 변경의 효용성 평가 (Effectiveness Evaluation According to Change of IJ Joint Box Location and Grounding System in Underground Transmission System)

  • 고광만;이종범
    • 전기학회논문지
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    • 제64권2호
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    • pp.247-253
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    • 2015
  • Dielectric breakdown accidents have been mainly occurred in the vicinity of service entrance section in underground power transmission systems. One cause among them is due to the excessive component value of sheath located around service entrance of cable. In this paper, as one of the alternative to prevent these accidents, the change of cross bond grounding system and the location change of IJ(Insulation Joint) are suggested. Also, to evaluate effectiveness of this changing system, circulating current and induced voltage of sheath were analyzed in steady and transient state. By comparison of the analytical results for the several possible changing systems, a grounding system and location of IJ which has the smallest sheath component values is proposed. In this paper, analysis to evaluate the proposed system is carried out by EMTP/ATPDraw. It can be used as a valuable operational material to prevent accident of the service entrance section in underground power transmission system.

GIS 절연진단센서 설계와 연면방전에 따른 방사전자파 특성 (A Design of Insulted Diagnosis Sensor and the Characteristics of Frequency Spectrum from the Radiated Electromagnetic Waves according to Surface Discharge)

  • 박숭규;최은혁;이광식
    • 조명전기설비학회논문지
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    • 제26권10호
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    • pp.27-34
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    • 2012
  • If obstacle in GIS(Gas Insulted Switchgear), its affects are great are on the community and it is consequently demanded lots of difficulities to recover and repair. Accordingly, diagnosis techniques, that are able to prevent from accidents before they happen by providing more stable and highly reliable power effectively and finding sign of the accidents is very important. A novel UHF(Ultra High Frequency)-microstrip antenna is presented. The measured impedance bandwidth of the proposed antenna is from 0.5GHz to 15GHz with the stop band from 0.5GHz to 10.7GHz for VSWR<2. Form results of this study, The antenna is will play an important role for the senser for insulation diagnosis system by UHF method of real site GIS and power equipment using $SF_6$ gas.

국내 전기안전시스템의 미시적 재해분석을 통한 선진국 전기안전시스템과 비교를 기반으로 한 국내전기안전시스템의 개념적 설계 (A Study on the Detail Conception of Korean Electrical Safety System Based on Comparing with Developed Countries by the Microscopic Analysis of Electricity Accidents)

  • 박동준;김정훈;박정욱
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2007년도 추계학술대회 논문집 전력기술부문
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    • pp.322-324
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    • 2007
  • In this paper conceptual design methodologies of electric safety systems are proposed by micro and macro views. As a pre-study electric accidents of Korea were analyzed microscopically, which could be categorized into 11 types by the occurrence frequency. These types are caused by common problems, which are educations, live works, dealing by the public, and grounding systems. And the korean electric safety system is analyzed macroscopically according to stages of the system comparing with that of developed countries.

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GIS 절연진달을 위한 센서 구조별 주파수 특성 (Frequency response of Sensors for GIS insulation-diagnosis)

  • 최은혁;김정배;김기채;이광식
    • 한국조명전기설비학회:학술대회논문집
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    • 한국조명전기설비학회 2007년도 춘계학술대회 논문집
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    • pp.413-416
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    • 2007
  • If obstacle in GIS(Gas Insulted Switchgear), its affects are great are on the community and it is consequently demanded lots of difficulities to recover and repair. Accordingly, diagnosis techniques, that are able to prevent from accidents before they happen by providing more stable and highly reliable power effectively and finding sign of the accidents is very important. The strip-senser measured impedance bandwidth of the proposed antenna is from 0.5[GHz] to 2.5[GHz] with the stop band from 0.5[GHz] to 1.7[GHz] for VSWR<2. The antenna is will play an important role for the senser for insulation diagnosis system by UHF method of real site GIS and power equipment using $SF_6$ gas.

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

  • 최상원
    • 한국안전학회지
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    • 제29권2호
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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.

전자연동장치의 안전성 활동에 관한 연구(II) (A Study on Fault Tolerant Digital Controllers for Programmable Electronic Interlocking System(II))

  • 박재영;이종우
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
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    • 제55권12호
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    • pp.667-673
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    • 2006
  • Programmable electronic interlocking system plays key role in railway operation and is closely related to railway accidents, in which the programmable electronic controller of interlocking system may become sources. Redundant digital controllers are adopted as the interlocking controllers to prevent the accidents from the controllers being out of order. The redundant digital controllers being fault tolerant are realized through dual or triplex controllers. In this paper, we calculated safety and availability of the redundant digital controllers using Markov models, demonstrated key part to determine the availability ana the safety.

전자파를 이용한 폐쇄배전반내 전력기기의 열화 온라인 진단시스템 개발 (Development of on-line system using electromagnetic wave for diagnosis of deteriorated power equipment in enclosed switchboard)

  • 강창원;최길수;이영상;강대수;김재철
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2001년도 춘계학술대회 논문집 유기절연재료 전자세라믹 방전플라즈마 연구회
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    • pp.178-181
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    • 2001
  • This paper presents the development of electromagnetic wave detecting equipment for diagnosis of enclosed switchboard. High voltage power equipments are very important equipment of the key industries and the private enterprise. Power line accidents are national plans because of those set off casualties lose of power equipments and communication networks. Therefore the necessity of the development of detecting for power equipment diagnosis is demand for prevention of high voltage equipment accidents. This paper is the development of electromagnetic wave detecting equipment for diagnosis of high voltage equipment. This paper establishes the diagnosis method for high voltage power equipments, that secures original technique and possesses detecting technique for electromagnetic wave. By the study we developed electromagnetic wave detector, and we applied this equipment application tests at the place constructed high voltage equipments.

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전원 전류 고조파 해석에 의한 직렬 아크 고장 검출 방안 (Series Arcing Fault Detection Method Using Harmonics Analysis of Supply Current)

  • 안정운;오용택
    • 조명전기설비학회논문지
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    • 제28권12호
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    • pp.30-37
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    • 2014
  • Recently, Concerns of imbalance for power supply has been raised by the increase of electric power consumption, but the interest of electric safety is still lacking due to the incompleteness of regulations. Particularly, Arcing fault, direct cause of electric fire accidents, is difficult to detect, interrupt due to unformal signal behaviour in previous research and apply to real system. In this paper, Arcing fault simulator device was fabricated to investigate the characteristics of series arcing fault and simulated the faults in various real load. Also, this study are analysed arcing fault signal by using the harmonic analysis of the acquired data from the current of the power supply and proposed the methods to prevent the series arcing fault accidents in advance.

철도 시스템 기능 안전(Functional Safety) 및 인증 (Railway System Functional Safety and Certification)

  • 김유호;이수환;박강훈;고태국
    • 전기학회논문지P
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    • 제63권4호
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    • pp.226-235
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    • 2014
  • Nowadays, railroads are considered the most efficient form of mass transportation. Furthermore, it is necessary that railroads be paired with state-of-the-art safety equipment. Unfortunately, it is impossible to prevent 100% of accidents that may be caused by system or human errors. In order to prevent future accidents, RAMS activity and Functional Safety Certification are required for new systems that are under development. In this paper we evaluate the necessity of the application of RAMS and the performance of RAMS in the system development process. We also explore the Safety Evaluation Procedure required for RAMS certification.