• Title/Summary/Keyword: Switching Impulse Voltage

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Analysis of Effect on Personnel Computer in case of turning off Power supply of Circuit Breaker for Low Voltage (저압용차단기 전원 개폐시 개인용 PC에 미치는 영향 분석)

  • Gil, Hyoung-Jun;Shong, Kil-Mok;Kim, Young-Seok;Kim, Chong-Min
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.28 no.12
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    • pp.124-129
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    • 2014
  • This paper describes the analysis of the effect on personnel computer in case of turning off power supply of main breaker in general electrical installation. In order to analyze the effect on personnel computer in case of turning off the power supply of main breaker, the switching impulse generator has been designed and fabricated which makes it possible to evaluate the effect on electrical product by switching impulse. The switching impulse tests were carried out for personnel computer according to applied voltage and number of switching impulse. As a consequence, switching impulse had not a significant influence on personnel computer in this study. The varistor of power input section functions as a protection of switching impulse as well as lightning impulse. The results will be used to related organization, and electrical product manufacturer, and residents.

Series-Gap Characteristics of Transmission Line Arrester with Switching and Lightning Impulse Flashover Test (개폐서지 및 뇌충격 섬락시험에 따른 송전 피뢰기의 직렬공극 특성)

  • Cho, Han-Goo;Yoo, Dae-Hoon
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2007.11a
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    • pp.484-485
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    • 2007
  • This paper describes the series-gap characteristics of transmission line arrester with switching and lightning impulse flashover test. The transmission line arrester exhibited external gap because it is must not flashover with switching impulse on the other hand it is must flashover with lightning impulse. In accordance, minimum and maximum length of series-gap was determinated with these tests. As gap length is increased flashover voltage was increased in the range of 315.4 kV~496.3 kV and negative polarity exhibited a high voltage. As a result, It was thought tat the series-gap length of transmission line arrester exhibited in the range of 580 mm~1100 mm.

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A Study on the Step Response Characteristics in Shielded Resistor Divider for Switching Impulse Voltage (개폐 충격전압 측정용 쉴드 저항분압기의 직각파 특성에 관한 연구)

  • Kim, Ik-Su;Lee, Hyeong-Ho;Jo, Jeong-Su;Park, Jeong-Hu
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.48 no.12
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    • pp.777-784
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    • 1999
  • Since the ultra-high voltage power apparatus are recommended to withstand switching surge generated from the electric power system, the switching impulse voltage is generally used to verify this requirement at the testing laboratories. Recently, the international standard(IEC 60060-2) related to the high voltage measurement techniques is revised requiring a traceability of measuring system for high voltage measurements. In this paper, a reference divider for switching impulse voltage is developed satisfying the revised. IEC standard and the possibility of applications has been investigated. Therefore, the characteristics of the high and low voltage side resistor and the shielding ring have been analyzed including the step response characteristics of the prototype divider. Throughout various efforts, it is confirmed that our measuring device has shown compatible characteristics as a reference divider.

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Series-Gap Characteristics of Polymeric Arrester for Transmission Line (송전선로용 폴리머 피뢰기의 직렬공극 특성)

  • Cho, Han-Goo;Yoo, Dae-Hoon;Lee, Young-Sun;Kim, Jong-Che
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2008.06a
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    • pp.491-492
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    • 2008
  • This paper describes the series-gap characteristics of transmission line arrester with switching and lightning impulse flashover test. The transmission line arrester exhibited external gap because it is must not flashover with switching impulse on the other hand it is must flashover with lightning impulse. In accordance, minimum and maximum length of series-gap was determinated with these tests. As gap length is increased flashover voltage was increased in the range of 315.4 kV~496.3 kV and negative polarity exhibited a high voltage. As a result, It was thought tat the series-gap length of transmission line arrester exhibited in the range of 580 mm~1100 mm.

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Improvement of triggering system of impulse voltage generator for Extra high-voltage (충격전압발생기 트리거 시동장치 성능개선)

  • Heo, J.C.;Park, S.J.;Moon, I.W.;Park, J.W.;Oh, C.S.
    • Proceedings of the KIEE Conference
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    • 2002.07c
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    • pp.1704-1706
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    • 2002
  • With increasement of use in electricity energy, quality of electric apparatus has been recognized as important factor in distribution and transmission line. Especially In laboratories, lightning and switching impulse performances of electric apparatus have been carrying out by impulse voltage generator (IVG), simulated into lightning and switching surge circuit. In this paper, we describe triggering system of impulse voltage generator(IVG) for extra high voltage, which has been newly designed.

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HY 1600kV/70kA Impulse Voltage/Current Test Facility (한양대학교 1600kV/70kA 충격 전압/전류 시험설비 구축)

  • Chang, Yong-Moo;Kim, Cheol-Ho;Hwang, Ryul;Lee, Bang-Wook;Koo, Ja-Yoon
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2009.11a
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    • pp.229-229
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    • 2009
  • This Impulse Voltage and Current Test System is designed for performing of impulse voltage tests with Lightning impulse voltage 1.2/50(LI) up to 1520kV peak value and switching impulse voltages 250/2500(SI) up to 1120kV peak valu acc. to IEC 60060-1, and furthermore for impulse current test, e.g. testing of arrester sections($U_{res}$=95kV)with current impulses 4/10 and 8/20 up to 70kA peak value.

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Review of the tracebility of impulse voltage measuring system in test laboratory (시험소 충격전압 측정시스템의 소급성검토)

  • Heo, J.C.;Choi, I.S.;Jeong, J.Y.;Ban, S.G.;Park, J.W.
    • Proceedings of the KIEE Conference
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    • 2003.07c
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    • pp.1632-1634
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    • 2003
  • For lihgtning and switching impulse voltage performances in laboratories, impulse voltage measuring system, which is consisted of voltage divider, recording instrument and connecting system between divider and recording instrument, is used. In order to show reliability of test result in test laboratory, tracebility of these measuring system to be using in test laboratory is needed. In this paper, we describe tracebility and uncertainty of impulse voltage measuring system in test laboratory.

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PD Characteristics of inverter-fed AC motor subjected to impulse voltage in electric train (전동차내 임펄스 전압인가에 따른 인버터구동형 유도전동기의 PD 특성)

  • Lee, Kang-Won;Kim, Ryong-Myung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2005.07a
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    • pp.564-565
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    • 2005
  • AC induction motor equipped in electric train is driven by VVVF inverter which produces switching pulse like impuse. Impulse voltage is more dangerous than continuous alternative voltage for the insulating performance of AC induction motor. This paper has investigated PD characteristics caused by impuse voltage for stator coils inserted in AC induction motor.

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Impulse Breakdown Behaviors of Dry Air as an Alternative Insulation Gas for SF6

  • Li, Feng;Yoo, Yang-Woo;Kim, Dong-Kyu;Lee, Bok-Hee
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.25 no.3
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    • pp.24-32
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    • 2011
  • [ $SF_6$ ]gas, which has an excellent dielectric strength and interruption performance, is used in various applications such as gas insulated switchgear (GIS) in substations. However, since $SF_6$ has a high global warming potential (GWP), it is necessary to find an eco-friendly alternative insulation gas. In order to examine the possibility of using alternative insulation gases for $SF_6$ in power distribution system equipment, the dielectric strength and physical phenomena of dry air in a quasi-uniform electric field are investigated experimentally in this paper. As a result, the breakdown voltages for positive polarity are higher than those for negative polarity under impulse voltage applications. The negative 50[%] flashover voltage, $V_{50}$ of dry air under conditions above 0.4[MPa] gas pressure, is higher than 150[kV], that is the basic impulse insulation level of distribution equipment. The $V_{50}$ increases linearly with increasing the gas pressure, regardless of the waveform and polarity of the applied impulse voltages. The voltage-time curves are dependent on the rise time of the impulse voltage and gas pressure. Furthermore, streamer discharge was observed through light emission images by an ICCD camera under impulse voltage applications.

A Study on the Measurements of Parameters Affecting the Breakdown Mechanism of a Large Air Spacing (이격거리가 큰 전극의 공기 절연파괴에 영향을 미치는 인자측정에 관한연구)

  • Cho, Yun-Ok;Choi, Young-Wook
    • Proceedings of the KIEE Conference
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    • 1988.07a
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    • pp.756-760
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    • 1988
  • The paper presents the measurement results on the parameters affecting the breakdown mechanism of a large air spacing under switching impulse voltages. Measured parameters are the velocities of leader channels, predischarge currents, electric charges injected into the rod-plane air gap and electric field intensities on the plane. For the 3m air gap under switching impulse voltages, the velocities of leader channel have been measured to be of 1cm/${\mu}s$ - 5cm/${\mu}s$, electric field intensity of 2kv/cm, predischarge current of 1.2A - 1.6A, the charges injected into the air gap of 11 - 40 ${\mu}$C for 400-887kV impulse voltages.

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