• Title/Summary/Keyword: Transmission lines

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A Robust Power Transmission Lines Detection Method Based on Probabilistic Estimation of Vanishing Point (확률적인 소실점 추정 기법에 기반한 강인한 송전선 검출 방법)

  • Yoo, Ju Han;Kim, Dong Hwan;Lee, Seok;Park, Sung-Kee
    • The Journal of Korea Robotics Society
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    • v.10 no.1
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    • pp.9-15
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    • 2015
  • We present a robust power transmission lines detection method based on vanishing point estimation. Vanishing point estimation can be helpful to detect power transmission lines because parallel lines converge on the vanishing point in a projected 2D image. However, it is not easy to estimate the vanishing point correctly in an image with complex background. Thus, we first propose a vanishing point estimation method on power transmission lines by using a probabilistic voting procedure based on intersection points of line segments. In images obtained by our system, power transmission lines are located in a fan-shaped area centered on this estimated vanishing point, and therefore we select the line segments that converge to the estimated vanishing point as candidate line segments for power transmission lines only in this fan-shaped area. Finally, we detect the power transmission lines from these candidate line segments. Experimental results show that the proposed method is robust to noise and efficient to detect power transmission lines.

A Novel Algorithm for Fault Type Fast Diagnosis in Overhead Transmission Lines Using Hidden Markov Models

  • Jannati, M.;Jazebi, S.;Vahidi, B.;Hosseinian, S.H.
    • Journal of Electrical Engineering and Technology
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    • v.6 no.6
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    • pp.742-749
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    • 2011
  • Power transmission lines are one of the most important components of electric power system. Failures in the operation of power transmission lines can result in serious power system problems. Hence, fault diagnosis (transient or permanent) in power transmission lines is very important to ensure the reliable operation of the power system. A hidden Markov model (HMM), a powerful pattern recognizer, classifies events in a probabilistic manner based on fault signal waveform and characteristics. This paper presents application of HMM to classify faults in overhead power transmission lines. The algorithm uses voltage samples of one-fourth cycle from the inception of the fault. The simulation performed in EMTPWorks and MATLAB environments validates the fast response of the classifier, which provides fast and accurate protection scheme for power transmission lines.

Development of Arm Insulator for Self-Build Based Emergency Tower (긴급복구용 자주조립식 철주 절연암 개발)

  • Min, Byeong-Wook;Wi, Hwa-Bog;Park, Jae-Ung;Lee, Cheol-Ho
    • Proceedings of the KIEE Conference
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    • 2007.07a
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    • pp.107-108
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    • 2007
  • Overhead transmission lines are completely exposed to the environment. This causes faults in transmission lines due to natural environmental conditions. In some cases, transmission towers are damaged by typhoons and snow, as well as sleet on the transmission lines. It takes a lot of time to repair the damaged towers. For emergency restoration purposes, steel poles are installed to temporarily supply power. Before 2003, emergency restoration steel poles were made of angled steel, which required a large number of beams, bolts, etc. In addition, the foundation of the steel pole and ground wire was constructed using excavation and burial methods, therefore it required a lot of manpower and time to construct temporary transmission lines. In September 2003, typhoon Maemi, whose maximum wind speed was 60m/s, hit Korea. 'Maemi' destroyed transmission lines in the Busan and Geojea area, causing long blackouts. To reduce the recovery time to the damaged transmission lines, self-build based emergency towers were developed. self-build based emergency towers reduced recovery time from 24 hours to 4 hours or less. However, the self-build based emergency tower had no arms, so the temporary transmission lines could only be constructed without curves in line routes. In this paper, solving these self-build based emergency tower limitations, using insulated arms(designed for use with the self-build based emergency tower), shall be explained.

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A Study on the Electrical Impulse Characteristics Between Transmission Line and Trees (송전선로와 수목과의 전기적 섬락특성)

  • Lee, H.K.;Cho, Y.K.;Kang, H.K.;You, C.H.
    • Proceedings of the KIEE Conference
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    • 2003.07a
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    • pp.516-518
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    • 2003
  • Our transmissions are mostly constructed on the mountains and passing over the mountains. The height of transmission lines are generally decided from the trees on the mountains. The height of the transmission lines is very important, because it has an effect on construction and maintenance costs of the transmission lines. We carried out tests for electrical impulse characteristics between trees and transmission lines, and suggested the test results.

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Progress and application on the insulation design of overhead transmission line in Korea (국내 가공송전선로 절연설계기술의 발전 및 적용)

  • Yoo, Chol-Hwan;Kim, Kyeong-Ho;Park, Soon-Kyu
    • Proceedings of the KIEE Conference
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    • 2000.07a
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    • pp.416-418
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    • 2000
  • Main power transmission network in Korea is consist of 154kV, 345kV transmission lines. Also 765kV transmission lines are on construction currently. There are some differences in the insulation design concept, methods and contents on 154kV, 345kV and 765kV overhead transmission lines respectively. In this paper, we described and summarized the applied insulation design concept, methods and features on each transmission lines.

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Spacer Damper Design for Bundled Conductor Transmission Lines (다도체 송전선로용 스페이서댐퍼 설계)

  • Lee, H.K.
    • Proceedings of the KIEE Conference
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    • 1998.07c
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    • pp.1235-1237
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    • 1998
  • Spacer Dampers must be carefully designed and tested. Because it can protect conductors from conductor oscillations due to winds and electrical forces. If the spacer damper has any problems in itself, it may cause extensive damage to the transmission lines. This paper suggests a design method and considerations of spacer damper for bundled conductor transmission lines.

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Analysis and Comparision of Measured and Calculated Value on Magnetic Fields Strength under Transmission Lines (초고압 송전선로의 자계크기 해석과 실측 비교)

  • Cho, Sung-Bae;Lee, Eun-Woong
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.48 no.7
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    • pp.832-838
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    • 1999
  • Recently, there are growing concerns about power frequency electric and magnetic fields coming out from the high voltage transmission lines, because of the wide spread perception of their probable harmful effect on human body. In connection with this trend, this paper describes the electric and magnetic fields measurement result around 154 kV and 345 kV transmission lines, a comparison of measured EMF to calculated one and the correlations between transmission lines currents and measured magnetic fields. Daily maximum and minimum magnetic field quantities under the selected 154 kV and 345 kV transmission lines had been measured for 1 year of 1997 and the average value of magnetic field exposure under the lines were calculated and presented based on the measured data.

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A Study on replacing transmission lines with STACIR for increasing power transmission capacity in the 345kv transmission system (345KV 송전선로의 송전용량 증대를 위한 STACIR 전선교체기술)

  • Kim, Yeong-Han;Bang, Hang-Kwon;Cho, Dae-Sung
    • Proceedings of the KIEE Conference
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    • 1998.07c
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    • pp.1103-1105
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    • 1998
  • It is becoming more and more difficult to construct new transmission lines because of many social problems. According to the load increase, Some of existing transmission lines will be heavy loaded over the limit. To solve this situation, one of method is peformed by replacing existing ACSR transmission lines with STACIR for increasing power transmission capacity in the 345kv transmission system. This paper presents several techniques for design and construction of transmission line replacement based on the actual experience in the 345kv Shinseongnam-Shinsiheung and Shinseongnam-Shinyeongseo transmission lines.

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Adequacy Evaluation of Composite Power System considering Overload of Transmission Lines (송전 선로의 과부하를 고려한 복합 전력계통의 공급능력평가)

  • Kang, Sung-Rok;Choi, Jae-Seok;Cha, Jun-Min;Rho, Dae-Seok;Do, Dae-Ho
    • Proceedings of the KIEE Conference
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    • 2002.07a
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    • pp.172-174
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    • 2002
  • This paper proposes a new methodology for adequacy evaluation of composite power system considering an ambiguity of overload of transmission lines. Nodal arrival powers under considering an ambiguity of overload of transmission lines can be evaluated using the proposed method. Fuzzy set theory has been used in order to consider the permission level of overload of transmission lines. The problem of adequacy evaluation has been formulated using fuzzy linear programing. The effectiveness of the proposed method considering permissible overload of transmission lines has been demonstrated on the IEEE RTS.

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Analysis of Different 500kV HVAC Transmission Lines Lightning Shielding

  • Nayel, Mohamed
    • Journal of the Korea Convergence Society
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    • v.4 no.4
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    • pp.49-57
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    • 2013
  • The lightning shielding of different 500 kV HVAC-TL high voltage AC transmission lines was analyzed. The studied transmission lines were horizontal flat single circuit and double circuit transmission lines. The lightning attractive areas were drawn around power conductors and shielding wires. To draw the attractive areas of the high voltage transmission lines, transmission line power conductors, shielding wires and lightning leader were modeled. Different parameters were considered such as lightningslope, ground slope and wind on lightning attractive areas. From the calculated results, the power conductors voltages affected on attractive areas around power conductors and shielding wires. For negative lightning leader, the attractive area around the transmission line power conductor increased around power conductors stressed by positives voltage and decreased around power conductors stressed by negative voltage. In spite of this, the attractivearea of the transmission line shielding wire increasedaround the shielding wire above the power conductor stressed by the positive voltage and decreased around the shielding wire above the power conductor stressed by negative voltage. The attractive areas around power conductors and shielding wires were affected by the surrounding conditions, such as lightning leader slope, ground slope. The AC voltage of the transmission lines made the shielding areas changing with time.