• Title/Summary/Keyword: 섬락

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22.9kV 노출충전부 형태 및 거리에 따른 섬락전압 변동특성 분석

  • 한기붕;한운기;이대종
    • Proceedings of the Korean Institute of Industrial Safety Conference
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    • 2002.05a
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    • pp.251-256
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    • 2002
  • 오늘날 산업문명의 발달은 전기에너지의 역할이 그 무엇보다도 큰 힘으로 작용하였다 할 수 있으며, 또한 우리의 일상생활 속까지 긱숙히 자리잡은 전기는 국민의 생활수준 향상과 비례하여 그 사용량이 지속적으로 증가하고 있다. 이러한 전기에너지는 과학적인 것으로서 제어통제가 가능하기 때문에 편리하고 안전하게 사용할 수 있지만, 자칫 부주의한 취급이나 잘못 사용할 경우에는 감전에 의하여 사망으로까지 이어질 수 있다.(중략)

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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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Influence of the Combustion Flames on the Flashover Characteristics of the Sphere-Sphere Air Gap (구-구갭의 섬락 특성에 미치는 연소화염의 영향)

  • Kim, In-Sik;Lee, Sang-Woo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.19 no.1
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    • pp.44-51
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    • 2005
  • In this paper, reduction characteristics of the AC and DC flashover voltage in the horizontal air gap of sphere-sphere electrode system were investigated when the combustion flame was present near the high voltage electrode. The voltage and current waveforms were measured, when the flashover is occurred, in order to examine the flashover polarity by flame. The reduction characteristics of AC flashover voltage were discussed with the thermal ionization process, the relative air density and the deflection phenomena in the shape of flames that caused by the coulomb's force. As the results of an experimental investigation, It was found that the reduction of flashover voltages in sphere-sphere system, in comparison with the no flame case, are $79.9[\%]$ for k=0, $82.9[\%]$ for k=0.5, $87.5[\%]$ for k=1.0, $85.0[\%]$ for h=0[cm], $40.8[\%]$ for h=5[cm] and $28.2[\%]$ for h=9[cm] when ac voltage is applied. The influence for thermal ionization process of the combustion flame in small scale no particular change is recognized.

The Flashover Characteristics of Test Electrodes against Clearance of Air Insulation for 765kV Transmission Line (765kV급 송전선로 공기절연거리 설정을 위한 시험전극의 섬락전압 특성)

  • Kim, Y.T.;Kim, Y.B.;Lee, H.H.;Kim, J.M.;Kim, J.B.
    • Proceedings of the KIEE Conference
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    • 1995.07c
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    • pp.1337-1340
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    • 1995
  • For the purpose of rational design of air insulation, it is need to experiment with similar to real shape test object and conform the characterisics. But basic distances of air insulation of transmission line, tower, etc. can be acquired from flashover characteristic of rod-rod, rod-plane electrodes. In this paper, before field test of 765kV transmission line for determination of distances of phase to ground insulation, we execute lightning, switching impulse test with test electrod(rod-rod, rod-plane) against clearances of air insulation. Each tests use up-down method and consist of 30 times flashover test. Flashover data treatment program and air correction program following IEC 60-1(1987) standard were completely builted.

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Flashover Characteristics of Damaged Insulator Strings for Live-line works in 765kV T/L (765kv 송전선로 활선작업을 위한 불량애자 발생 유형별 전기적 섬락특성 분석)

  • Lee, H.K.;Shon, H.K.;Park, M.Y.;Park, I.P.;Kim, H.J.
    • Proceedings of the KIEE Conference
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    • 2005.05b
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    • pp.31-34
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    • 2005
  • The 765kV transmission line will be maintained by live-line works for efficient operation, In order to maintain the 765kV transmission lines safely by live-line works, lineman have to know flashover characteristics of the insulator strings with damaged insulators. This paper suggests flashover characteristics of the 765kV insulator strings from experimental test results directly.

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Wavelet-Based Flashover Prediction Using High-Frequency Components (고주파 성분을 사용한 웨이블렛 기반 섬락 예측)

  • Song, Young-Chul
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.4
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    • pp.759-761
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    • 2010
  • In order to monitor operating performance of contaminated outdoor insulators, a wavelet-based flashover prediction method is proposed. In most cases, the low-frequency components, namely, fundamental, $3^{rd}$, and $5^{th}$ harmonic components have been mainly used for the sake of the spectral analysis of the leakage current. However, in this paper, the detail coefficients of wavelet transform representing high-frequency components are used as important information to predict a flashover in the contaminated insulator. Experimental results verify that the proposed method has a superior capability for flashover prediction.

Insulation Characteristic of Moisturized Epoxy Compound (흡습된 에폭시 절연물의 절연 특성)

  • Kim, Dong-Myung;Park, Young-Keun;Kwon, Tae-Ho;Choi, Sun-Gyu;Lee, Byoung-Ho;Choi, Won-Suk
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2004.11a
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    • pp.343-346
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    • 2004
  • 가스절연개폐기의 절연물로 사용되는 에폭시가 흡습환경에 노출될 경우 절연내력은 급격히 저하된다. 에폭시 절연물에 함유되어 있는 수분은 어느 일정 온도에서는 가스 내 수분과 평형을 이루고 있지만 온도변화에 따라 수분은 이동되며 또 고전압 인가 시 절연체 표면은 열화 되어 장기간에 걸쳐 침식과 함께 Treeing 현상을 유발시킨다. 본 연구에서는 에폭시 절연물의 절연특성에 미치는 수분의 영향을 파악하기 위하여 실 계통에서 사용된 제품에 대해 AC 내전압시험 및 재료분석을 시행하였다. 분석결과, 표면의 파괴전압은 주수량에 따라 건조섬락전압의 최대 1/5까지 저하되었다.

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Development of a Polymeric jumper Support insulators for Overhead Transmission Line (송전용 고정형 폴리머 점퍼지지 애자장치 개발)

  • Min, Byeong-Wook;Kim, Tai-Young;Choi, Jin-Sung;Son, Kwang-Mok;Lee, Chul-Ho;Jeon, Young-Jun
    • Proceedings of the KIEE Conference
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    • 2011.07a
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    • pp.440-441
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    • 2011
  • 온난화 등 기후변화의 영향으로 국내에 미치는 태풍의 수와 강도가 점점 증가하는 추세이며, 태풍 및 국지성 돌풍에 의한 송전선로의 과도한 점퍼선 횡진은 점퍼선과 철탑간의 공기절연거리를 감소시켜 지락사고가 발생하는 원인이다. 따라서 점퍼선의 횡진으로 인한 섬락고장을 예방하기 위하여 세계적으로 사용량이 증가하고 있는 폴리머 재질의 애자를 적용하여 전기 기계적 특성을 분석하고 국내 최대 순간풍속 62.7m/s의 풍압력 조건에도 견딜 수 있는 철탑부착 고정형 폴리머 점퍼지지 애자장치를 개발하게 되었다.

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Consideration on shielding failure and back flashover through lightning fault analysis within the country (국내에서 발생한 낙뢰고장 분석을 통한 직격뢰 및 역섬락 고찰)

  • Choi, Han-Yeol;Min, Byeong-Wook;Park, Soon-Kyu;Lee, Bong-Hee;Gu, Sung-Wan
    • Proceedings of the KIEE Conference
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    • 2009.07a
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    • pp.280_281
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    • 2009
  • The past 3 years study on the lightning faults data shows that the main reason is shielding failure rather than back flashover. Accordingly, we need to thoroughly consider about shielding failure angle of tower. Also, transmission line damage caused by shielding can be minimized if we avoid the steep slope area as a transmission line route.

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Determination of insulation distance in transmission line considering probability of contamination induced fault and lightning induced fault (염해오손도와 낙뢰고장가능성을 고려한 송전선로의 절연거리 산정)

  • Kwak, Joo-Sik;Kang, Yeon-Woog;Koo, Kyo-Sun;Kweon, Dong-Jin
    • Proceedings of the KIEE Conference
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    • 2008.10a
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    • pp.149-150
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    • 2008
  • 본 논문에서는 운전중인 154 kV 및 345 kV 송전선로에서 철탑 구조의 변경 없이 애자의 수량을 증결하여 절연성능을 보강하는 방안에 대한 연구결과를 제시하고 있다. 송전선로에서 발생 가능한 상용주파과전압과 개폐과 전압의 최대값을 EMTP 해석모델을 이용하여 계산하고 이로부터 뇌섬락 고장확률과 급속오손고장확률을 고려한 절연거리 증대 및 소요애자수량 방법을 제시하고 있다.

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