• Title/Summary/Keyword: EHV-1

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The Application of Al-foil Electrode for Detecting Partial Discharge Signal in Middle Joint Box of EHV Power Cable (초고압 전력케이블용 중간 접속부 내의 부분방전신호 검출을 위한 박전극 응용)

  • Lee, Yong-Sung;Yang, Jong-Kyung;Yang, Jong-Keok;Choi, Yong-Sung;Park, Dae-Hee
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2005.11a
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    • pp.142-144
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    • 2005
  • To detect partial discharge of 154kV joint box, we have made experiment by using the Al-foil electrode sensor. Generally the signals which are detected in partial discharge test of underground power transmission cable are accompanied wi th both noises of high voltage and noises of surrounding power cable. The most noise in near to end part of joint box is corona, beside other noises flowed from surrounding area. Partial discharge test is difficulty due to these noises. First, we had used Al-Foi1 sensor on middle joint box of 154[kV] underground transmission power cable, and then analyzed reliability of calibration signal by using the Al-Foi1 electrode sensor of NJB. From above results, decrement properties measured highly. But incase of injecting calibration signal of 500[pC] after measuring signals in IJB, the S/N ratio had about 25[dB] acquisition.

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Design of Dielectric Detector for FRP Hot Stick in EHV Live line Maintenance

  • Chawporn, Talerngkiat;Sriratana, Witsarut;Trisuwannawat, Thanit
    • 제어로봇시스템학회:학술대회논문집
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    • 2005.06a
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    • pp.2063-2066
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    • 2005
  • This paper presents an approach to detect the dielectric condition of FRP Hot Stick in EHV high voltage cable whereas shutting down the power system is not necessary. The radio frequency generating method is adopted by transmitting radio wave into the Electrodes. This instrument is small, easy to use and also inexpensive. Furthermore, the impurity level of dirt on high voltage insulator (non-ceramic type) will be analyzed by using the methods based on IEEE Std.978-1984 at 105 kV.DC. /305 mm. and OSHA Regulation 1910.269 Part J - live line tools. The frequency at 10-20 MHz is applied to FRP Hot Stick via Electrode1 and from FRP Hot Stick surface to Electrode 2. After that the results will be evaluated by testing in each condition of FRP Hot Stick, such as dry surface, hot surface, foil winding and conductor inserting. Finally, the watt loss will be examined and compared with the loss from humidity and Carbon tracking. The important components of this system are radio frequency generating unit, frequency stabilizing unit, frequency amplifier, FRP Hot Stick frequency counter, processing unit, and display unit.

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The Lightning Current Parameters that Impact on the Surge Analysis of the EHV Gas Insulated Substation by EMTP

  • Shim Eung-Bo;Han Sang-Ok
    • KIEE International Transactions on Electrophysics and Applications
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    • v.5C no.1
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    • pp.1-7
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    • 2005
  • This paper describes the lightning surge analysis model of extra high voltage GIS using EMTP. Various lightning current parameters were investigated in order to confirm the impact on the lightning surge analysis such as lightning current amplitude, waveform, size of GIS, tower footing resistance and surge arresters. The multi-story tower model and EMTP/TACS model were introduced for the simulation of dynamic arc characteristics. The margin between the maximum overvoltage and BIL of the GIS was about 10 percent and the margin between the maximum overvoltage and BIL of the transformer was 21 percent.

A Characteristics of Leakage Current and Temperature on Forest Fire of EHV Polymer Insulator for 154KV T/L (154kV 송전용 폴리머 애자의 산불에 대한 누설전류 및 온도 특성)

  • Choi, In-Hyuk;Choi, Jang-Hyun;Park, Jun-Ho;Lee, Dong-Il;Kim, Tae-Young
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2006.06a
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    • pp.517-518
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    • 2006
  • In this paper, to understand the effect of forest fires on polymer insulators for transmission lines, it was observed the aging of the housing surface of the polymer insulators. And, this paper shows the way how to create the artificial field testing in order to simulate forest fire. As the results of, maximum leakage current peaks by influence of flame increased from 1[mA] to 1.4[mA], and SEM results show the inorganic component on the housing surface because the organic component matters disappeared. Therefore, the case of exposed by forest fire, polymer insulator can be used in the early stage, but an exchange needs active countermeasure to be stabilize power delivery.

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PD Localization by Metal Sheath Interruption Methods for Power Cable and Accessories (차폐분리에 의한 전력케이블 및 접속함의 부분방전 위치 검출)

  • Lee, Chang-Yeong;Sin, Du-Seong;Kim, Chung-Sik;Kim, Dong-Uk;Park, Wan-Gi
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.49 no.3
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    • pp.196-201
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    • 2000
  • It is very important not only to detect PD signal but also to locate PD source in power cable line including its accessories. In this paper, the PID localization technique using interruption of metal sheath of cable or accessory is described. By interruption of metal sheath, the polarity of PD pulse to be measured on each part can be compared. With this technique, the exact location of PD in the accessory which has some defects can be found. Although the 'Soft' interruption method, that is, cable sheath is divided by semi-conductive layer with the resistance of higher than 1 k$\Omega$, was used instead of 'Hard' interruption method, it is also possible to detect exact location of PD. This technique is considered to be very effective for detecting PD localization in the type test of cable and accessories.

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Adhesion Behaviors of Semiconductive-Insulation Interfaced Liquid Silicone Rubber for EHV Cable Accessory (초고압 접속재용 반도전-절연체 액상실리콘 계면의 접착거동)

  • Yoon, Seung-Hoon;Kim, Hyun-Seok;Kim, Ji-Hwan;Lee, Jung-Hee
    • Proceedings of the KIEE Conference
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    • 2003.10a
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    • pp.123-127
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    • 2003
  • 액상실리콘으로 이루어진 초고압전력케이블용 프리몰드 접속재의 반도전-절연체 계면접합체를 다양한 제조조건과 조합별로 제조하여 계면접착력에 대한 영향을 검토하였다. 후가교적용 시 계면접착력이 강화되며 grade조합에 따른 특성차이가 존재하였다. 하지만 고온 장시간의 후가교 조건에서는 계면간의 화학적 결합력의 저하로 인해 오히려 접착력이 낮아지기도 하였다. 절연 RTV와의 계면접착성은 S-1재료가, 절연 LSR의 경우에는 S-3 재료가 가장 우수하였으며 도전안정성 측면에서도 S-3 재료가 상대적으로 유리하였다. 매입형 전극체를 제조하여 절연파괴거동을 연구한 결과 계면접착성과의 직접적인 상관관계는 크지 않음을 알 수 있었다.

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EMTP Simulation study for flashover phenomenon due to lighting in EHV transmission line (EMTP를 이용한 초고압 송전선로의 뇌격에 의한 섬락현상 모의계산)

  • Kwak, J.S.;Woo, J.W.;Jo, S.J.;Kim, W.G.;Kim, I.S.
    • Proceedings of the KIEE Conference
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    • 2005.07a
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    • pp.661-663
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    • 2005
  • 본 논문에서는 2회선 초고압 송전선로의 4.5 km 이격한 서로 다른 송전철탑에서 발생한 섬락사고의 원인을 규명하기 위한 연구결과를 소개하고자 한다. 섬락사고는 낙뢰가 원인을 제공한 것으로 추정되었으며 2회선중 각각 1개 상의 섬락고장을 동시에 유발하였다. 뇌고장은 낙뢰의 송전선 침입 위치에 따라 역섬락과 차폐실폐 고장으로 분류하고 각기 다른 대책을 적용한다. 연구에서는 고장유발 낙뢰의 크기를 모의계산을 통하여 추정하고 낙뢰에 의한 섬락 형태를 밝히고자 하였다.

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An Environmental Design Study for selecting Conductor Configurations of the next Extra High Voltage Transmission Line (차기 초고압 송전선로의 도체방식 선정을 위한 환경설계 연구)

  • Park, D.W.;Ahn, H.S.;Yang, K.H.;Kim, J.B.;Chung, S.J.;Min, S.W.
    • Proceedings of the KIEE Conference
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    • 1989.11a
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    • pp.197-200
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    • 1989
  • The corona interference of extra high voltage (EHV) transmission lines has to be considered as an important design factor for establishing an electrical environmental countermeasure at a basic line design stage. This paper describes the conductor selection procedure through both corona performance test result in corona cage and its evaluation by the design criterion. It is known that three conductor configurations including $6{\times}810mm^2$ (spacing: 40 cm) are the suitable conductor bundle for the environmental preservation around both 2-circuits and 1-circuit T/L.

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The Application of Pre-Breakdown Partial Discharge Detection Method for Breakdown of Investigation of Long Distance XLPE Cable (장조장 XLPE 케이블 절연 파괴 원인 규명을 위한 전구차단 장치의 응용)

  • Lee, C.Y.;Kim, D.W.
    • Proceedings of the KIEE Conference
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    • 2002.07c
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    • pp.1827-1829
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    • 2002
  • This paper describes AC test for long delivered drum length of cable using pre-breakdown partial discharge detection(PPD) method, which can be applied to observe the causes of electrical breakdown of EHV XLPE insulation. This method is to de-energize applied voltage to cable rapidly using pre-breakdown partial discharge, and is able to prevent complete breakdown. By this effect, defects such as voids, metal particles and protrusion in cable can be observed clearly. AC resonant test set was used for PPD method. Localization of partial discharge was performed by time difference detection of the traveling wave. Accuracy of localization was 1% to the length of test cable. Through several experiments with XLPE cable, successful results of PPD method were obtained.

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A Study on the Electromagnetic Interference from 765kV Test Line (765kV 시험선로에서의 전자파 장해에 관한 연구)

  • 김정부;이동일;신구용;양광호;안희성;구자윤
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.7 no.1
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    • pp.36-42
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    • 1996
  • In general, EMI(electromagnetic interference) from EHV(extra high voltage) power lines above 50kV cause interference to AM radio and low VHF television reception. This paper describes the results of long-term measurement of RI and TV1 in 765kV, double circule of $6\times29.59mm$(1.65k inches) diammer $480mm^{2}$(Rail) ACSR conductors in suitable for 766kV transmission lines to provide acceptable EMI at 15m fro the beneath of outmost phase.

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