• Title/Summary/Keyword: Distribution line

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EMTP 시뮬레이션을 통한 배전선로의 1선 지락 사고시 화재 조사 기법에 관한 연구 (A Study on Fire Investigation Technique For Single Line to Ground Faults in Distribution Line Using EMTP Simulation)

  • 유정현;김희식;이훈기;조용선
    • 한국안전학회지
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    • 제33권3호
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    • pp.21-26
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    • 2018
  • Approximately 20% of the total fire is electrical fire, and electrical energy is a potential source of heat. Large-scale fault currents that occur during a line ground fault flow into electric utility poles, electric power equipment, or electric appliances of the customer, and cause simultaneous electrical fire. In this paper, we investigated the possibility of fire through the change of fault current flowing in faulty and sound feeder in case of 1 line ground fault in 22.9 kV distribution line. We propose a fire investigation analysis method for simultaneous multiple electrical fire such as evidence analysis method, and fault current occurrence confirmation method in case of fire accident by analyzing the fault current occurring in the ground fault in the distribution line using EMTP, electric power system analysis program.

Analysis of Induced Voltage on Telecommunication Line in Parallel Distribution System

  • Kim, Hyun-Soo;Rhee, Sang-Bong;Lee, Soon-Jeong;Kim, Chul-Hwan;Kim, Yoon Sang
    • Journal of Electrical Engineering and Technology
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    • 제9권2호
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    • pp.726-732
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    • 2014
  • A current flowing through a distribution conductor produces induced voltage, which is harmful to a telecommunication line. Previous research on induced voltage has been focused on single-circuit lines in the distribution system. However, the double-circuit lines, referred to as parallel distribution lines, are widely used in distribution systems because they have significant economic and environmental advantages over single-circuit lines. Therefore, a study on the induced voltage in double-circuit lines is needed. This paper presents a method of calculating the induced voltage in a parallel distribution system using four-terminal parameters and vector analysis. The calculation method is verified by the Electromagnetic Transient Program (EMTP) simulation.

배전계통의 고저압 혼촉고장시 중성선 전위상승에 따른 저압기기 스트레스 전압 (Transferred OverVoltages on LV sides in Multigrounded Neutral during Line to Ground Fault on Distribution Systems)

  • 최선규;최종기;김경훈;최명호;이병성
    • 전기학회논문지
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    • 제61권6호
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    • pp.910-915
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    • 2012
  • In this paper we propose multi-grounded neutral design method which was considered of transferred transient overvoltage when line to neutral fault occurs. Specially, In order to confirm the actual transient overvoltage magnitude which occurs on neutral line, we considered some screening(shielding) effects. The screening coefficient was deducted from field test results and calculation in a distribution line which is identical with an actual power line. The purpose of this paper is to attempt to suggest the guidance for grounding skystem design considering limitation of overvoltage for LV side in IEC 61936. The result is based on EMTP simulation and real field faults situation in distribution lines.

지중송전 및 배전계통에서 알루미늄 도체 선로운용의 실용성 평가 (Evaluation of Operation Practicality on Line with Aluminum Conductor in Underground T&D Systems)

  • 장주영;이종범;김용갑
    • 전기학회논문지
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    • 제60권3호
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    • pp.492-499
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    • 2011
  • This paper describes that the evaluation on operation practicality of Al conductor cable will be used instead of Cu conductor cable. Analysis is divided into two kinds of cases as transmission and distribution. To evaluate that Al conductor line has the insulation strength indeed safely, various analysis and calculation such as single line-to-ground fault current, lightning surge and allowance current were carried. Model was established based on real combined transmission and distribution is being used in utility with EMTP. The analysis results on Al and Cu conductor line were compared each other. It was proved that Al conductor line can be operated instead of Cu conductor line without special insulation problem in transmission and distribution, in electrical view point such as overvoltage and allowance current.

Effects of Aperture Densitv Distribution on the Flow Through a Rock Fracture with Line-Source and Line-Collection

  • Park, Chung-Kyun;Hahn, Pil-So
    • Nuclear Engineering and Technology
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    • 제30권6호
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    • pp.485-495
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    • 1998
  • Migration characteristics of tracers in a rock fracture in a case of line-source and line-collection was studied. The fracture plane was discretized into a square mesh to which variable apertures were assigned. The spatially varying apertures of a fracture were generated using a geostatistical method, based on a given aperture probability density distribution and a specified spatial correlation length. The flow potential and pressure at each node were computed. Calculations showed that fluid flow occurs predominantly through a few preferred paths. Hence, the large range of apertures in the fracture gives rise to flow channeling. The solute transport was calculated using a particle tracking method. The migration plumes of tracer between injection line and withdrawal line are displayed in contour plots. The elution curves are shown to be controlled by the aperture density distribution and to be insensitive to statistical realization and spatial correlation length.

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로봇 Off-Line Programming을 위한 페인트 스프레이 시뮬레이션 방법론 개발 (An Accurate and Efficient Method of the Spray Paint Simulation for Robot OLP)

  • 이승찬;송인호;범진환
    • 한국CDE학회논문집
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    • 제13권4호
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    • pp.296-304
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    • 2008
  • Recently, various attempts are being done to apply off-line programming system to field of paint robot. But most commercial simulation softwares have problems that are slow simulation speed and not support various painting paramenters on simulation. This paper proposes enhanced paint simulation method for off-line programming system. For these, this method used the mathematical model of flux field from a previous research. The flux field has the flux distribution function, which reflects on the feature of paint spray. A previous research derived this flux distribution function for an integral function and calculated paint thickness function for an integral function. But if flux distribution function is defined as an integral function, it is inadequate to use for real-time simulation because a number of calculation is needed for estimation of paint thickness distribution. Therefore, we defined the flux distribution function by numerical method for reducing a mount of calculation for estimation of paint thickness. We derived the equation of paint thickness function analytically for reducing a mount of calculation from the paint distribution function defined by numerical method. In order to prove proposed paint simulation method this paper compares the simulated and measured thickness. From this comparison this paper show that paint thickness distribution is predicted precisely by proposed spray paint simulation process.

다중선로 고장을 고려한 배전자동화용 개폐기 설치기준 (The Standard for Installation of Automated Distribution Switch-gear in Multi-Line Faults)

  • 이중호;하복남;조남훈;임성일
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1999년도 하계학술대회 논문집 C
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    • pp.1079-1081
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    • 1999
  • This paper presents the standard for dividing/tieing the distribution lines and installing optimally the automated distribution switch-gear in multi-line faults. Also this paper recommends the distribution system design in consideration of the live load transfer of the concentrated load in the last load-side. This recommendation will be useful for designing the distribution network, developing the feeder automation software and operating the distribution automation system.

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배전기기 전압계측 정밀도 평가시스템 개발 및 성능시험 (A Development and Performance Test of Voltage Measurement Accuracy Assessment System for Distribution Equipment)

  • 조진태;김주용;이학주;김재한
    • 조명전기설비학회논문지
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    • 제27권9호
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    • pp.83-89
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    • 2013
  • Power distribution system has been changed from radial system to closed loop or mesh system due to connection of distributed generation growth. Data from distribution equipments which are installed at distribution line is required to be accurate for the performance of DMS(Distribution Management System). This paper analyzes the voltage measurement data from distribution equipment. However, the results of the analysis are confirmed to have some errors in voltage measurement data from distribution equipment. These errors come from aging of voltage sensor in distribution equipment and inaccurate data transfer to FRTU(feeder remote terminal unit) through the controller. The main problem is that the voltage measurement data of distribution equipment can not be assessed after it's first installation at the distribution line. The voltage measurement accuracy assessment system is to assess the voltage measurement data from distribution equipment on hot-line. This study had a field test to verify the performance of system.

고압 수은등의 온도분포 측정에 대한 연구 (A study on the temperature distribution measurement of the high pressure mercury lamp)

  • 손승현;김상용;김창섭;지철근
    • 한국조명전기설비학회:학술대회논문집
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    • 한국조명전기설비학회 1990년도 추계학술발표회논문집
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    • pp.35-40
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    • 1990
  • Temperature distribution of high pressure mercury lamp has been mesured as a function of time using spectroscopic method. Sampling signal which is synchronized by lamp voltage was used to mesure temporal line intensity at each radius. To obtain radial temprature distribution, the mesured intensity was transformed into radial line intensity by Abel's formula. Absolute temperature profile was calculater from relative intensities of spectral lines as a function of line and tube radius. The temperature profile is very similar to the electrical tube current profile.

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전력선 통신을 활용한 케이블 식별 기술 (Cable Identification Technology based on Power Line Communication)

  • 변희정;최상준;손수국
    • 한국정보통신학회:학술대회논문집
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    • 한국정보통신학회 2015년도 춘계학술대회
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    • pp.880-883
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    • 2015
  • 배전선 케이블을 식별하는데 전력선 통신기술이 제안된다. 전력선 통신 기술의 응용 영역을 확대하게 된다. 고주파 신호는 배전선에서 전달 능력에 한계 능력을 갖는다. 보통 배전계통의 전력 변압기는 그러한 고주파 신호의 전달을 차폐하게 된다. 이러한 제안된 전송제한 방법을 사용하여 케이블을 식별하는데 적용된다. 새로운 형태의 전력선 케이블 식별시스템이 설계 및 구현된다. 시스템은 전력선 통신 모듈을 바탕으로 송수신기로 구성된다. 이론적 개념을 검증하기 위한 실험이 행하여진다. 또한 시뮬링크 시뮬레이터를 사용하여 개념에 대한 이해를 위한 시뮬레이션이 수행된다.

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