• Title/Summary/Keyword: arc-discharge

Search Result 178, Processing Time 0.358 seconds

A Study of the Current Collection Characteristics Measurement Methodology for a High-Speed Train (고속열차 전기적 이선 특성 측정 방안 연구)

  • Cho, Hong-Shik;Han, In-Su;Lee, Tae-Hyung;Kim, Seok-Won;Kim, Young-Guk
    • Proceedings of the KSR Conference
    • /
    • /
    • pp.3052-3058
    • /
    • 2011
  • A high-speed train is the system that the electric power is supplied through the overhead contact line and drives motors. In this case that the de-wiring beteen the overhead contact line and the pantograph of a high-speed train, the occasion that smooth power supply is not accomplished occurs sometimes. If the de-wiring occurs, the arc discharge may damage the overhead contact line or the pantograph, and the falling-off in power quality may cause the damage and malfunctioning of motor block. This paper presents the methodology that the arc discharge by de-wring between overhead line and pantograph is discriminated through measuring the PT and CT in the vehicle, and measures the current collection characteristics for a high speed train.

  • PDF

The analysis of leakage current characteristics of polymer insulators for estimation under Pollution conditions (고분자 절연물의 내오손 진단을 위한 누설전류 특성 해석)

  • Kim, I.S.;Han, S.W.;Cho, H.G.;Soh, J.J.;Kim, H.S.
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.1452-1454
    • /
    • 1997
  • Properties of flashover in polymer insulators are very important under pollution environments. It is necessary to analyse flashover characteristics whether insulators are still safe or not. A lot of precious information can be got out of polluted polymer insulators through leakage current measurement. The behavior of partial arc discharge leads to flashover directly. It is possible to measure partial arc discharge as leakage current pulses analysis. The shape of histogram reflects degree of pollution, wetting and voltage stress level. It can be expressed by Weibull distribution function.

  • PDF

Diagnostic Technique of a Switchboard by Frequency Analysis of Radiated Electromagnetic Wave (방사전자파의 주파수분석에 의한 배전반 진단기술)

  • Park, Dae-Won;Kim, Sun-Jae;Jung, Kwang-Seok;Kil, Gyung-Suk;Jo, Eun-Je
    • Proceedings of the KSR Conference
    • /
    • /
    • pp.41-45
    • /
    • 2010
  • In this paper, we analyzed the frequency spectrum of radiated electromagnetic waves generated by series arc- and corona- discharges as a basic study to develop an online diagnostic technique for power facilities installed inside switchboards. To simulate corona and series arc discharges, an arc generator specified in UL1699 and a corona generator were fabricated. The experiment was carried out in an electromagnetic shielding room, and the measurement system consists of an Ultra Log Antenna and an EMI Test Receiver. The frequency spectrum exists in ranges from 30 to 500 [MHz] for series arc discharge and 30 [MHz] to 2 [GHz] depending on defects for corona discharge. The peak frequency of series arc discharge and corona were 40 [MHz], 80 [MHz] and 35 [MHz]~160 [MHz], respectively.

  • PDF

Optimum formation method of curved core cross section of silica fiber (실리카 광섬유 코어의 곡률단면 형성 최적화 방법)

  • Kim, Se-Min;Kim, Seung-Hwan;Lee, Seung-Hun;Hwang, Seok-Hyeon;Kim, Mi-Gyeong;HwangBo, Chang-Gwon;Kim, Gyeong-Heon
    • Proceedings of the Optical Society of Korea Conference
    • /
    • /
    • pp.288-289
    • /
    • 2009
  • We report an optimum fabrication condition for formation of concave lens shaped core cross-section of silica single-mode fibers with hydrofluoric (HF) acid solutions and arc discharge. A desired depth of curved cross-section of the silica fiber core and its surface smoothness were obtained with optimized concentration of the HF solution, etching time, and arc discharge condition.

  • PDF

직렬아크 방전의 주파수 스펙스럼 분석

  • Kim, Seon-Jae;Jeong, Gwang-Seok;Park, Dae-Won;Gil, Gyeong-Seok
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • /
    • pp.24-24
    • /
    • 2010
  • In this paper, we analyzed the frequency spectrum of electromagnetic waves which is generated by series arc discharges to develop a condition monitoring technique in a closed-distribution board. We fabricated an arc generator specified in UL1699 to simulate series arc discharge. The experiment was carried out in an electromagnetic shielding room, and the measurement system consists of a Ultra Log Antenna and a EMI Test Receiver. The results showed that the frequency spectrum during series arc discharges was distributed in ranges of 30~500 [MHz], and the peak values were existed at 40 [Mhz] and 80 [MHz].

  • PDF

Propagation Characteristics of Surge Generated due to Internal Arc Discharge in Superconducting Magnet (초전도 마그네트 시스템 내부 아크방전에 의한 발생 서어지의 전파특성)

  • Choi, Byoung-Ju;Suehiro, Junya;Hara, Masanori
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.1904-1906
    • /
    • 1996
  • Transient voltage distribution tests are carried out to evaluate effects of a high frequency oscillating voltage generated in a superconducting magnet as a result of the arc discharge extinction. Especially, the effects of temperature and conduction state of the magnet conductor on surge behavior are carefully investigated. Based on the results of simulation tests, it is shown that internal voltage waveforms are influenced by its transmission along the superconducting wire and reflection at the terminal and that attenuation process of the waveforms depends considerably on the conductor resistance which decreases with lowering the temperature.

  • PDF

A Study on the Electrical and Mechanical Properties of a Epoxy Powder for Compact Bus Duct (콤팩트 부스덕트용 에폭시분체도료의 전기적.기계적 특성연구)

  • Kim, Sang-Hyun;Choi, Jin-Wook;Kim, Dong-Wook;Kim, Hyun-Hee
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.22 no.3
    • /
    • pp.210-217
    • /
    • 2009
  • Insulated methods of compact bus duct has been applied a way of coating Epoxy powder. The problem which is caused by degradation during operation is very important in severe environment. Therefore, this study compared and verified many kind of properties ; electrical breakdown by thermal and water aging, v-t characteristic, arc discharge, mechanical properties, bending test and cross cut. Sample D was stable before the $T_g$ to be about $7{\sim}10 %$ decrease in the breakdown test according to temperature change. In case of V-t and arc discharge, it had been kept up suitable characteristic. Also, in case of electrical and mechanical characteristic, both sample D and A have excellent capacity.