• Title/Summary/Keyword: power distribution line

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Empirical Study on the Dip Design and Installation of Distribution Line Conductors (배전선로의 이도설계 및 시공에 대한 실증연구)

  • Ahn, Ihn-Seok
    • Journal of the Korean Society of Industry Convergence
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    • v.24 no.3
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    • pp.307-313
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    • 2021
  • In this study, the comparative analysis, among the design standard value of distribution power, the calculated value from the measurement data of strand and the empirical data of the distribution line itself, have been performed for the elastic coefficients and linear expansion coefficients of distribution line conductors. The empirical values of elastic coefficients were lower about 10.6%(892kgf/mm2) than those of the design standard value of the distribution power and there were a little difference between the empirical values of linear expansion coefficients and the design standard value of the distribution power. From the above results, it could be concluded that the empirical values of conductor characteristics should be used in the dip design and installation of distribution line.

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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    • v.2 no.1
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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.

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

  • Byun, Hee-Jung;Choi, Sang-jun;Shon, Sugoog
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2015.05a
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    • pp.880-883
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    • 2015
  • Power-line communication technology is proposed to identify cables of power distribution systems. It can extend the application area of power-line communication. Distribution line cable circuits have only a limited ability to carry higher frequencies. Typically power transformers in the distribution system prevent propagating the higher frequency carrier signal. The proposed method uses the limited propagation ability to identify the cable. A novel power cable identification system is designed and implemented. The system consists of a transmitter and a receiver with power-line communication module. Some experiments are conducted to verify the theoretical concepts. Also some simulations are done to help and understand the concepts by using Simulink simulator.

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A Study on the Surge Analysis considering Surge Arrester and Grounding System in the Combined Distribution System (혼합 배전계통에서 피뢰기적용과 접지시스템 변경을 고려한 서지 해석에 관한 연구)

  • Yun, Chang-Sub;Lee, Jong-Beom;Kim, Beong-Suk
    • Proceedings of the KIEE Conference
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    • 2006.07a
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    • pp.204-205
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    • 2006
  • This paper describes the protective ability of lightning arrestor in combined distribution system with power cable. To evaluate the protective ability, change of arrestor and grounding location are considered. On the other hand, arrestor developed by Cooper Power Systems for underground power cable system, is considered to evaluate surge protective ability as in underground system, when arrestor occurs failure has overhead line. The result shows that lightning arrestor in combined distribution system with power cable protect effectively when failure at arrestor in overhead line. On the other hand, arrestor developed by Cooper Power Systems for underground power cable system, is considered to evaluate surge protective ability in underground distribution system, when arrestor of overhead line has failure. The result shows that lightning arrestor installed in underground cable can effectively protected cables from surge when arrestor of overhead line has failure. And also even though grounding locations are decreased, it is revealed that protective ability is nearly similar.

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A Study On The Characteristics Of The Medium Voltage Power Distribution Line Channel By Wideband Channel Impulse Response Measurement Using PN Sequence (PN 시퀀스 방식의 광대역 임펄스 응답 측정을 통한 고압 배전선로 채널 특성 연구)

  • Oh Hui-Myoung;Choi Sung-Soo;Lee Jae-Jo;Kim Kwan-Ho;Whang Keum-Chan
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.54 no.1
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    • pp.56-60
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    • 2005
  • In the power-line communication(PLC) systems, the power line is a wired medium. However, the power line channel has the multi-path fading characteristics like the wireless channel in the wireless communication systems because it has the signal reflection and divergence by the impedance mismatching between many branch lines and loads. So the analysis of the multi-path characteristics is very important, and it has been doing by the several measurement methods for the impulse response between the transmitter and the receiver. PN sequence method has originally been used as a wideband impulse response measurement mettled for wireless channel, but it is recently being applied to not only the wireless channel but also the wired channel like the power line channel. This method is more useful and effective for the long distance communication channel like the medium voltage power distribution line with the multi-paths[1]. In this thesis, we have measured impulse response for the medium voltage power distribution line channel by the wideband measurement method using PN sequence, analytically studied the measured data and presented the results.

Bus-voltage Sag Suppressing and Fault Current Limiting Characteristics of the SFCL Due to its Application Location in a Power Distribution System

  • Kim, Jin-Seok;Lim, Sung-Hun;Kim, Jae-Chul
    • Journal of Electrical Engineering and Technology
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    • v.8 no.6
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    • pp.1305-1309
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    • 2013
  • The application of the superconducting fault current limiter (SFCL) in a power distribution system is expected to contribute the voltage-sag suppression of the bus line as well as the fault-current reduction of the fault line. However, the application effects of the SFCL on the voltage sag of the bus line including the fault current are dependent on its application location in a power distribution system. In this paper, we investigated the fault current limiting and the voltage sag suppressing characteristics of the SFCL due to its application location such as the outgoing point of the feeder, the bus line, the neutral line and the 2nd side of the main transformer in a power distribution system, and analyzed the trace variations of the bus-voltage and fault-feeder current. The simulated power distribution system, which was composed of the universal power source, two transformers with the parallel connection and the impedance load banks connected with the 2nd side of the transformer through the power transmission lines, was constructed and the short-circuit tests for the constructed system were carried out. Through the analysis on the short-circuit tests for the simulated power distribution system with the SFCLs applied into its representative locations, the effects from the SFCL's application on the power distribution system were discussed from the viewpoints of both the suppression of the bus-voltage sag and the reduction of the fault current.

Insulation Diagnostics of Power Cables and Application to Real Distribution System (케이블 절연열화진단과 실 계통 적용)

  • Yi, Dong-Young;Kim, Ju-Yong;Song, Il-Keun
    • Proceedings of the KIEE Conference
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    • 1999.07d
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    • pp.1569-1571
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    • 1999
  • In this work, we have performed the application experiment for real distribution line to diagnose the underground power cables using DC voltage decay measurement system. We have also performed the Isothermal Relaxation Current test for the same distribution line using KDA-l. We could confirmed possibility of grading the insulation aging state of underground power cables. Therefore, we conclude that it is possible to apply DC voltage decay method to the real distribution line.

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Analysis of the Switch Installation Criteria by Increasing Operating Capacity in Distribution Line (배전선로 운전용량 상향에 따른 개폐기 설치 기준 분석)

  • Jo, Nam-Hun;Ha, Bok-Nam;Lee, Heung-Ho
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.51 no.6
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    • pp.290-295
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    • 2002
  • The present assignment in installing the number of switches for distribution line was made on the basis of a normal feeder capacity 7,000kVA in KEPCO(Korea Electric Power Corporation), Korea. But the normal capacity is revised to 10000kVA in 1998. Even increasing limit of the operating capacity of the distribution lines enables us to give some benefit for the operation flexibility and investment cost of the distribution system. It is disadvantageous in the viewpoint of supply reliability. In distribution systems, switches are equipped to improve the reliability of distribution systems by minimizing the outage section due to fault and maintenance. Utility generally improves the reliability by minimizing the length of outage section, which is caused by fault and maintenance, through switch equipment on distribution system. In order to cope with the changes such as operation capacity, it is necessary to study whether the present criteria is reasonable or not, also to confirm whether the present criteria of installing switches in line is improved or not. In this study, we proposes the number of switch per feeder on the basis of present operation capacity in distribution system.

A study for IT Based Optimal Voltage Control Method of Distribution Systems with Distributed Generation (IT기반 분산전원 연계 배전계통의 최적전압조정에 관한 연구)

  • Kim, Jung-Nyun;Baek, Young-Sik;Seo, Gyu-Seak
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.55 no.4
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    • pp.139-143
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    • 2006
  • Recently, standard of living improved and Information-Communication industry developed rapidly. Thereby, interest about electric power quality is rising worldwide. So, research and Development to enhance electric power quality in various viewpoint until most suitable supply system from each kind device to improve electric power quality. And specially, interest about voltage quality is rising by diffusion increase of information communication appliance and minuteness control appliance etc. Also Power consumption is increasing, but expansion of large size generator by environmental and site security problem is difficult. So, introduction of distribution generation is investigated actively by electric-power industry reorganization. Voltage management of power system had been controlled by ULTC (Under Load Tap Changer) in substation and pole transformer on the high voltage distribution line. But, voltage control device on substation and distribution line is applied each other separatively. Therefore, efficiency of line voltage control equipment is dropping. Also, research about introduction upper limit of distribution generation is consisting continuously. This paper presents cooperation use way between voltage control device and introduction upper limit of distribution generation for most suitable voltage control in distribution power system.

A Study on the Development of Corrosion Detecting System for 22.9 kV Distribution Power Line Insulation Cable (22.9kV 배전선로 절연전선의 부식 검출 시스템 개발에 대한 연구)

  • Kim, Yong-Jun;Oh, Yong-Cheul;Yi, Keon-Young
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.7
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    • pp.1410-1416
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    • 2011
  • A corrosion detecting system for 22.9 kV distribution power line insulation cable, which can travel autonomously along the live line, is proposed. Eddy current test method is employed to detect the corrosion, and the system developed here is capable of detecting internal corrosion of a ACSR-OC. Somewhat details of the electrical and mechanical mechanism of the system and traveling algorithm are introduced. Experimental results applied to the sample cables having artificial corrosion and the operating distribution lines are provided. From the result, we confirmed that the system is useful for detecting internal corrosion of a ACSR, and is expected to be a new non-destructive testing equipment in the area of diagnosis for the distribution power line.