• 제목/요약/키워드: Distribution line

검색결과 2,926건 처리시간 0.046초

배전선로 주변에서의 전자계 분포 해석 (Analysis of Electromagnetic Field Around Distribution Line)

  • 권명락
    • 한국전기전자재료학회논문지
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    • 제30권10호
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    • pp.672-676
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    • 2017
  • Electrical energy is playing an increasingly vital role as the primary energy source in everyday life. With the increase in electric power consumption, power facilities are under an increasing stress and must operate at a high capacity. Consequently, the demand for electric power cables in power transmission and distribution lines is rapidly increasing. Underground distribution lines have been steadily replacing the aboveground lines owing to the increase in electric power demand and the need to increase the supply voltage. In addition to line damage, worker safety is of primary concern in this type of underground infrastructure. In this study, to improve the safety of workers dealing with underground transmission lines, we analyzed the electromagnetic field generated around the distribution line and determined the basic criteria for developing a device that can detect a live underground line.

배전선로의 특이파형 검출 방법에 관한 연구 (A Study on Detection Method of Specific Waveform in Distribution Line)

  • 이진;박찬
    • 한국전기전자재료학회논문지
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    • 제32권2호
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    • pp.151-156
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    • 2019
  • The aim of this investigation is to detect specific waveforms in a distribution line prior to the occurrence of a fault. Conditions were introduced such that a feeder remote terminal unit (FRTU) of the distribution automation system selects and stores fault waveforms from the different waveforms detected in the distribution line. In addition, an algorithm was developed to detect specific waveforms from the fault waveforms stored using the FRTU. This algorithm exploits the duration and periodicity of harmonic changes in voltage and current. The efficacy of the algorithm was confirmed based on the measurements of fault waveforms in an actual distribution line. The results indicated that faults in a distribution line can be predicted via experimental measurements.

배전계획 시스템(DISPLAN) 및 배전계통 운영계획 시스템(DLPLAN)의 개발 (The Development of Distribution Planning System and Distribution Line Planning System)

  • 채우규;박창호;정종만;정영호
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2004년도 하계학술대회 논문집 A
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    • pp.73-75
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    • 2004
  • This paper presents the ability and the application of software packages for distribution planning which are DISPLAN(Distribution Planning System) and DLPLAN(Distribution Line Planning System) developed in KEPCO. After calculating size and position of maximum load by administration section for distribution, it forecasts the demand of distribution load considering growth location, increment, new load plan, etc of load by annual. Also it calculates distribution loss, voltage drop using modeled distribution line by you, and support for establishment and enlargement plan of substation and distribution line, decision of most optimal path. And it presents the abstract of used algorithm to develop this system.

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3상회로의 직접해석에 의한 송배전계통 선간단락 사고 고장거리 계산 알고리즘 (A New Line to Line Fault Location Algorithm in Distribution Power Networks using 3 Phase Direct Analysis)

  • 최면송;이승재;임성일;진보건;이덕수
    • 대한전기학회논문지:전력기술부문A
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    • 제51권9호
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    • pp.467-473
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    • 2002
  • In this paper, a fault location algorithm is suggested for line to line faults in distribution networks. Conventional fault location algorithms use the symmetrical component transformation, a very useful tool for transmission network analysis. However, its application is restricted to balanced network only. Distribution networks are, in general, operated in unbalanced manners, therefore, conventional methods cannot be applied directly, which is the reason why there are few research results on fault location in distribution networks. Especially, the line to line fault is considered as a more difficult subject. The proposed algorithm uses direct 3-phase circuit analysis, which means it can be applied not only to balanced networks but also to unbalanced networks like distribution a network. The comparisons of simulation results between one of conventional methods and the suggested method are presented to show its effectiveness and accuracy.

공통중성선 3상4선식 배전선로의 중성선 전위상승에 관한 연구 (Researches on the Potential Rises on the Neutral Line in Three Phase, Four-Wire Distribution Line Systems)

  • 박영문
    • 전기의세계
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    • 제18권6호
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    • pp.23-32
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    • 1969
  • The thesis has derived the formulas and computational algorithms useful for predicting and constraining the potential rises on the neutral line in 3-phase, 4-wire distribution line systems in the case of contact faults and single-line grounding faults. In addition it has suggested economically optimal designing conditions herewith of the distribution line systems in conduction with the potential restraining cost functions.

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Quantitative Evaluation of Dislocation Density in Epitaxial GaAs Layer on Si Using Transmission Electron Microscopy

  • Kim, Kangsik;Lee, Jongyoung;Kim, Hyojin;Lee, Zonghoon
    • Applied Microscopy
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    • 제44권2호
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    • pp.74-78
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    • 2014
  • Dislocation density and distribution in epitaxial GaAs layer on Si are evaluated quantitatively and effectively using image processing of transmission electron microscopy image. In order to evaluate dislocation density and distribution, three methods are introduced based on line-intercept, line-length measurement and our coding with line-scanning method. Our coding method based on line-scanning is used to detect the dislocations line-by-line effectively by sweeping a thin line with the width of one pixel. The proposed method has advances in the evaluation of dislocation density and distribution. Dislocations can be detected automatically and continuously by a sweeping line in the code. Variation of dislocation density in epitaxial GaAs films can be precisely analyzed along the growth direction on the film.

혼합 배전선로에 직격낙뢰시 전주와 케이블직선접속재가 케이블 동심중성선 전위상승에 미치는 영향 (A Study of Concentric-Neutral Line Voltage Increase Related by Pole and Cable Joint When Lightening Overvoltage Injected in Combined Distribution Line)

  • 전용주;전명수
    • 전기학회논문지
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    • 제67권6호
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    • pp.702-707
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    • 2018
  • In case of Lighting occurs in Domestic combined distribution line, normally the voltage for the neutral line increase dramatically. General connection for underground cable is bundled common earth type so the lightning over voltage increase at the concentric-neutral line is not big enough to give impact on cable sheath. But in case of Non bundled common earth type it is necessary to analyze the phenomena on cable sheath caused by lightening overvoltage. Especially pole and cable joint are the core factor to consider. In this paper concrete pole and cable joint were evaluated in case of Non bundled common earth type combined distribution Line. EMTP simulation model has been designed and several case study were made. Also several experimental test were made to verify the simulation result.

22.9 kV-y 실긍장 배전선로 모의를 위한 집중정수회로의 설계 (The Design of Lumped Constant Circuit for the Simulation of A Real 22.9 kV-y Distribution Line)

  • 윤철호;정영호;한용희
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1999년도 하계학술대회 논문집 C
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    • pp.1186-1188
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    • 1999
  • When we perform the test related to the power distribution system such as artificial fault test, protective coordination test, distribution automation test in short length test line, Lumped Constant Circuit, a kind of variable impedance, should be attached to the test line in order to make it equivalent to a real line in length electrically. In this paper we designed the positive sequence and zero sequence Lumped Constant Circuit with optimized inductor and resister for the modification of long, 16km, distribution line, when they are attached to the short, 4km, distribution test line.

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22.9kV 배전선로 비행점검 방법 적용에 관한 연구 (The Study on Application of Flying Inspection Method for the 22.9kV Distribution Line)

  • 장정일;강병석
    • 전기학회논문지
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    • 제61권2호
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    • pp.194-198
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    • 2012
  • This paper describes flying inspection apparatus for 22.9kV distribution line. This apparatus is composed of multi-copter(more than 4 propellers), camcorder and remote controller. The existing inspections, such as hot-line inspection job and optical inspection method and distribution Line Checking Robot, have many restrictions. A electric working vehicle and hot-line job license are essential in hot-line inspection job. Besides its high cost, it can't be applied to the electric pole over 18m and road-blocked area. Optical method can't inspect upper side of electric facilities mounted on the electric pole. Robot method can't be applied to the corroded overhead earth wire and nothing of overhead earth wire. To solve the problems, in Korea Electric Power Co., we have applied flying inspection apparatus to the 22.9kV distribution line. The results of trial application show that this paper is practical and effective for the inspection technical method in 22.9kV distribution line

유한요소법 기반의 무차원화를 이용한 판 유효 변형률 분포 예측 온라인 모델 개발 (The development of On-line Model for the Prediction of Effective Strain Distribution by Non-dimensionalization on FEM Basis)

  • 김성훈;이중형;황상무
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2004년도 제5회 압연심포지엄 신 시장 개척을 위한 압연기술
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    • pp.359-367
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    • 2004
  • In this research on-line model for the prediction of the effective strain distribution in strip on finishing mill process is presented. To describe the effective strain distribution in strip, three guide points and a distribution fitting variable are used. On-line models to get these points and fitting variable non-dimensionalization method and least square method were used with FEM simulation results. The model is developed using strip only FEM simulation as reference sets and compared with roll coupled FEM simulation results as perturbed sets. The on-line model to describe effective strain distribution shows good agreement with coupled FEM analysis results.

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