• 제목/요약/키워드: Distribution line

검색결과 2,928건 처리시간 0.033초

컴퓨터 프로그램 온라인 판매를 위한 유통 및 인증 기술 (An Authentication Technology for On-line Computer Program Distribution)

  • 임신영;이성민;김태윤
    • 산업공학
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    • 제13권1호
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    • pp.141-146
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    • 2000
  • Through an on-line software distribution, a user can get the software easily using Internet. As purchase, receipt and installation of software are executed via on-line batch process the time for software purchase and installation can be reduced. In this paper, we describe technologies for on-line software distribution and propose a secure software distribution and installation protocol for electronic commerce.

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배전선로에 고압 condenser적정배치에 관한 연구 (Study For The Economic Size And Location Of High Voltage Condenser On Domestic Distribution Line)

  • 유석구
    • 전기의세계
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    • 제22권6호
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    • pp.24-32
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    • 1973
  • When applying capacitors to distribution line, an effort must be made to determine the economic benefits resulting from the installation of a capacitor. There have been many papers and articles published on the economics of capacitors. Most of these are special cases, or have so many qualifications that they are not much use for other cases unless very careful attention is given to minute details. A general economic analysis on a distribution line is very complicated problem. Consequently, a diagram solution is illustrated for determining the economic condenser and applying resonably well for the distribution line with any load division.

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ON-LINE CALCULATION OF 3-D POWER DISTRIBUTION

  • Park, Y. H.;W. K. In;Park, J. R.;Lee, C. C.;G. S. Auh
    • 한국원자력학회:학술대회논문집
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    • 한국원자력학회 1996년도 춘계학술발표회논문집(1)
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    • pp.459-464
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    • 1996
  • The 3-D power distribution synthesis scheme was implemented in Totally Integrated Core Operation Monitoring System (TICOMS), which is under development as the next generation core monitoring system. The on-line 3-D core power distribution obtained from the measured fixed incore detector readings is used to construct the hot pin power as well as the core average axial power distribution. The core average axial power distribution and the hot pin power of TICOMS were compared with those of the current digital on-line core monitoring system, COLSS, which construct the core average axial power distribution and the pseudo hot pin power. The comparison shows that TICOMS results in the slightly more accurate core average axial power distribution and the less conservative hot pin power. Therefore, these results increased the core operating margins. In addition, the on-line 3-D power distribution is expected to be very useful for the core operation in the future.

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시간 불일치성을 고려한 배전계통 전압조정방법 (Voltage Regulation Method Considering Load Variation Characteristics of High and Low Voltage Distribution Line in Distribution System)

  • 김태응;김창순;김재언;손진만;박종근;노대석;김광호;조재형
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 하계학술대회 논문집 A
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    • pp.115-117
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    • 2002
  • In general, it is supposed that load characteristics of high and low voltage distribution line are always coincidence. But in practical distribution system, voltage variation characteristics of high and low voltage distribution line are not same. Then in this paper, we proposes a voltage regulation method considering load variation characteristics of high and low voltage distribution line in distribution system.

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실증시험을 통한 지중배전선로 모델링 기법 검증 연구 (Verification of Underground Distribution Line Modeling with Field Test)

  • 윤창섭;이재봉;김병숙;이종범
    • 전기학회논문지
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    • 제56권12호
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    • pp.2091-2097
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    • 2007
  • This paper described the verification of modeling technique of underground distribution from comparison between field test and simulation. It needs more exact transient phenomenon analysis model to establish lightning protection of underground distribution line. Although, there were a lot of transient phenomenon researches, nobody could has verified the confidence of modeling from field tests in interior until now. So, simulation model verified field test is needed to analyse transient phenomenon of underground distribution system. The examination must be accomplished in many different condition before suggesting these verified analysis model. In this paper, the conditions were examined and the various data results on the different line composition was compared with the EMTP simulation, when the lightning impulse test was accomplished at underground distribution line. Also the value between field test and simulation was very closed and the method of modeling has demonstrated confidence, when the method is used to analyse domestic transient phenomenon of underground distribution.

배전계통 고장위치 검출방법에 관한 연구 (A Study on the Estimating Locations of Faults on Distribution Power Systems)

  • 김미영;오용택;노대석
    • 대한전기학회논문지:전력기술부문A
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    • 제53권12호
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    • pp.670-677
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    • 2004
  • The Conventional approach for estimating the locations of transmission line shunt faults has been to measure the apparent impedance to the fault from a line terminal and to convert the reactive component of the impedance to line length. But, these methods do not adequately address the problems associated with the fault location on distribution systems. This thesis presents a technique that estimates the location of shunt fault on a radial distribution system that has several single and multiphase laterals. Tapped loads and non-homogenity of the distribution system are take into account. The developed technique, which can handle shunt faults was tested to evaluate its suitability. Results from computer simulation of faults on a model of a 25KV distribution lines like real system are presented. The results approved that the proposed technique works well for estimating the locations of the distribution line shunt faults.

Characteristic Impedances in Low-Voltage Distribution Systems for Power Line Communication

  • Kim, Young-Sung;Kim, Jae-Chul
    • Journal of Electrical Engineering and Technology
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    • 제2권1호
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    • pp.29-34
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    • 2007
  • The input and output impedances in a low voltage distribution system is one of the most important matters for power line communication because from the viewpoint of communication, the attenuation characteristic of the high frequency signals is greatly caused by impedance mismatch during sending and receiving. The frequency range is from 1MHz to 30MHz. Therefore, this paper investigates the input and output impedances in order to understand the characteristic of high frequency signals in the low voltage distribution system between a pole transformer and an end user. For power line communication, the model of Korea's low voltage distribution system is proposed in a residential area and then the low voltage distribution system is set up in a laboratory. In the low voltage distribution system, S parameters are measured by using a network analyzer. Finally, input and output impedances are calculated using S parameters.

배전계통 저압배전선 전압강하 추정방법 (Estimation of Voltage Drop in Low Voltage Distribution Line)

  • 김태응;김창순;김재언;손진만;박종근;노대석;김광호;조재형
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 하계학술대회 논문집 A
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    • pp.118-120
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    • 2002
  • Voltage drop of low voltage distribution line is closely related with proper voltage regulation. It depends on the voltage drop of pole transformer, low voltage distribution line, and low voltage customer entrance line. Using above voltage drop factors, we proposes an estimation method of voltage drop in low voltage distribution line. Proposed method has been applied to a 22.9kV practical distribution system.

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지중 배전계통 적용을 위한 광복합 케이블 실시간 감시시스템 개선 (An Improvement of Optical Fiber Composite Power Cable On-Line Monitoring System for Underground Distribution Network)

  • 조진태;김주용;이학주;박중성
    • 조명전기설비학회논문지
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    • 제26권7호
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    • pp.77-83
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    • 2012
  • Since power system is switching to smart grid, on-line monitoring technology has become necessary for underground distribution power cable. Therefore, the application of DTS(Distributed Temperature Sensing) technology using OFCPC(Optical Fiber Composite Power Cable) capable of monitoring underground distribution power cables has been developed. These can bring about reductions in faults and increases in operating capacity of underground distribution system. To date, the test-bed of optical fiber composite power cable on-line monitoring system has been constructed. Then, matters to be improved have been drawn through verification experiments. This paper presents the improvement and experiment results of the optical fiber composite power cable on-line monitoring system to apply to underground distribution lines in the field.

혼합배전계통 선로구성요소 변화를 고려한 선로 서지해석 (Surge Analysis Considering Variation of Line Configuration Factor in Combined Distribution Systems with Power Cables)

  • 김병숙;이장근;한병성;이종범
    • 전기학회논문지
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    • 제56권3호
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    • pp.472-480
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    • 2007
  • This paper analyzes overvoltage on testing line for various parameter effect examination. Model systems consist of overhead line and underground cable. The model considered actual characteristic data of distribution lines. and will be constructed at testing yard. The simulations were performed under various line configuration such as cable kinds, cable length, lightning wave, lightning wave time, transformer and branch circuits. The simulation models are established by EMTP/ATPDraw and Line Constants are calculated by ATP_LCC. When lightning surge strikes on conductor of overhead line, EMTP/ATPDraw calculates overvoltage in many cases. Simulation results will be compared with real testing results at testing yard. The compared results will be used to establish protection methods in actual underground distribution systems.