• Title/Summary/Keyword: Surge Arrester

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Electrical properties of 18kV ZnO surge arrester according to the variation of surrounding conditions (외부환경 변화에 따른 배전용 피뢰기의 전기적 특성)

  • Lee, Bok-Hee;Lee, Seung-Ju;Lee, Su-Bong;Jung, Dong-Sung;Shin, Hee-Kyung
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2008.05a
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    • pp.289-292
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    • 2008
  • This paper describes the electrical characteristics of the ZnO surge arrester according to the variation of surrounding conditions. To investigate the characteristics of degraded ZnO surge arrester, 8/20 [${\mu$s], 2.5 [kA] impulse currents were applied to the ZnO surge arrester to be test. To present the effect of the surrounding con야tions, the leakage currents of ZnO surge arrester were measured to the surrounding temperature and wet conditions. As a result, the increase of ambient temperature causes the increase of resistive leakage current of ZnO surge arrester. Also, in the wet test, the outside leakage current through the ZnO surge arrester housing is much larger than the intrinsic leakage current.

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Degradation properties of ZnO surge arrester due to lightning impulse current (뇌임펄스 전류에 의한 ZnO 배전용 피뢰기의 열화특성)

  • Lee, Seung-Ju;Lee, Bok-Hee;Lee, Su-Bong;Kim, Dong-Soung;Shin, Hee-Kyung;Jung, Dong-Cheol
    • Proceedings of the KIEE Conference
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    • 2008.07a
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    • pp.1305-1306
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    • 2008
  • In this work, in order to investigate the effect of lightning impulse currents on ZnO surge arrester. and the deterioration characteristics of ZnO surge arrester, 8/20 [${\mu}s$], 2.5 [kA] impulse currents were applied to the ZnO surge arrester under test. The leakage currents of ZnO surge arrester were measured and ZnO element was analyzed by X-ray photoelectron spectroscopy. As a result, the resistive leakage current of ZnO surge arrester was increased with the injection number of lightning impulse currents.

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Deterioration Characteristics of ZnO Surge Arrester Blocks for Power Distribution Systems Due to Impulse Currents (임펄스전류에 의한 배전용 ZnO 피뢰기 소자의 열화특성)

  • Lee, Bok-Hee;Cho, Sung-Chul;Yang, Soon-Man
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.27 no.3
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    • pp.79-86
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    • 2013
  • In order to analyze the electrical performance of ZnO surge arresters stressed by the combined DC and AC voltages that are generated in DC/AC converter systems, the leakage current properties of ZnO surge arrester blocks deteriorated by impulse currents were investigated. The test specimens were deteriorated by the 8/$20{\mu}s$ impulse current of 2.5kA and the leakage currents flowing into the deteriorated zinc oxide(ZnO) arrester blocks subjected to the combined DC and power frequency AC voltages are measured. As a result, the leakage currents flowing through deteriorated ZnO surge arrester blocks were higher than those flowing through the fine ZnO surge arrester blocks and the larger the injection number of 8/$20{\mu}s$ impulse current of 2.5kA is, the greater the leakage current is. The leakage current-voltage curves(I-V curves) of the fine and deteriorated ZnO surge arrester blocks stressed by the combined DC and AC voltages show significant difference in the low conduction region. Also the cross-over phenomenon is observed at the voltage close to the knee of conduction on plots of I-V curves.

Performance Evaluation and Housing Design for Direct Current Surge Arrester in Railway Rolling Stock (직류 전차 탑재형 피뢰기의 하우징 설계 및 성능평가)

  • 조한구;김석수;한세원;이운용
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.07a
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    • pp.128-131
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    • 2000
  • The main objective of this paper is to design and test a new type of polymer ZnO surge arrester for DC power system of railroad vehicles. The rated voltage is 1500V direct current. The main research works are focused on structure design by finite element method, rating voltage, temporary over voltage and studies of characteristics of polymeric surge arrester.

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Transient State Analysis in Case of Lightning Arrester Deterioration due to Lightning Surge (뇌서지로 인한 피뢰기 열화시 과도상태 분석)

  • Lim, Sung-Yong;Kim, Kyu-Ho;Rhee, Sang-Bong;Kim, Soo-Bae
    • Proceedings of the KIEE Conference
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    • 2015.07a
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    • pp.276-277
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    • 2015
  • As the effect of global warming continues, surge rates in Korea are also getting increased. Although there are devices to protect distribution line from the surge like lightning arrester, insulation of the lightning arrester can be destroyed if frequent surge occurs in distribution line. This paper assumed that the lightning surge hits the lightning arrester and make this device's insulation destroyed. This paper also simulated these processes utilizing EMTP/ATPDraw and verified voltage behavior when faults such as line to ground fault due to frequent lightning surge occur in lightning arrester.

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Characteristics and Change of Electrode Surface in Moisture Absorption on the Series Gap Surge Arrester (직렬 갭 피뢰기의 흡습시 전극표면의 변화 및 특성)

  • Cho, Han-Gu;Kim, Hyang-Suk
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2003.07b
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    • pp.1172-1175
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    • 2003
  • The characteristics and change of electrode surface about Gap type surge arrester for protect DC subway rail were investigated with moisture absorption. Compared that tested about DC/AC discharge commencement voltage, residual voltage, Impulse, square wave impulse for DC rail surge arrester about Gap type surge arrester of moisture absorption state. The AC discharge commencement voltage acted greatly effect of moisture absorption than the DC discharge commencement voltage test.

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Design and Performance Evaluation of Surge Arrester for Loading in Railway Rolling Stock (전철 탑재용 피뢰기의 설계 및 성능평가)

  • Cho, H.G.;Han, S.W.;Lee, U.Y.;Kim, S.S.;Chang, T.B.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.05a
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    • pp.74-77
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    • 2000
  • The main objective of this paper is to design and test a new type of polymer ZnO surge arrester for AC power system of railroad vehicles. Metal oxide surge arrester for most electric power system applications, electric train and must not have explosive breakage of the housing to minimize damage to other equipment when subjected to internal high short circuit current. When breakdown of ZnO elements in a surge arrester occurs due to flashover, fault short current flows through the arrester and internal pressure of the arrester rises. The pressure rise can usually be limited by fitting a pressure relief diaphragm and transferring the arc from the inside to the outside of the housing. However, there is possibility of porcelain fragmentation caused by the thermal shock. pressure rise, etc. Non-fragmenting of the housing is the most desired way to prevent damage to other equipment. The pressure change which is occurred by flashover become discharge energy. This discharge energy raises to damage arrester housing and arrester housing is dispersed as small fragment. Therefore, the pressure relief design is requested to obstruct housing dispersion. The main research works are focused on the structure design by finite element method, pressure relief of module, and studies of performance of surge arrester for electric railway vehicle.

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A Study on Module Design and Performance of Polymer Arrester (폴리머 피뢰기의 모듈 설계 및 성능에 관한 연구)

  • Cho, Han-Goo;Chun, Jong-Uk;Kang, Yeong-Kil
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2003.05e
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    • pp.108-111
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    • 2003
  • The main objective of this paper is to module design and pressure relief test a new type of polymer gapless surge arrester for power distribution line. Metal oxide surge arrester for most electric power system applications, power distribution line and electric train are now being used extensively to protect overvoltage due to lightning. Surge arresters with porcelain housing must not have explosive breakage of the housing to minimize damage to other equipment when subjected to internal high short circuit current. When breakdown of gapless elements in a surge arrester occurs due to flashover, fault short current flows through the arrester and internal pressure of the arrester rises. The pressure rise can usually be limited by fitting a pressure relief diaphragm and transferring the arc from the inside to the outside of the housing. However, there is possibility of porcelain fragmentation caused by the thermal shock, pressure rise, etc. Non-fragmenting of the housing is the most desired way to prevent damage to other equipment. The pressure change which is occurred by flashover become discharge energy. This discharge energy raises to damage arrester housing and arrester housing is dispersed as small fragment. Therefore, the pressure relief design is requested to obstruct housing dispersion.

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Relief Performance of Fault Current and Design/Manufacturing of Polymer Arresters for Power Distribution (배전선로용 폴리머 피뢰기의 모듈 설계/제조 및 성능)

  • Cho, Han-Goo;Yun, Han-Su;Jang, Tae-Bong;Chie, In-Hyuk
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2005.05b
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    • pp.175-179
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    • 2005
  • The main objective of this paper is to module design and pressure relief test a new type of polymer gapless surge arrester for power distribution line. Metal oxide surge arrester for most electric power system applications, power distribution line and electric train are now being used extensively to protect overvoltage due to lightning. Surge arresters with porcelain housing must not have explosive breakage of the housing to minimize damage to other equipment when subjected to internal high short circuit current. When breakdown of gapless elements in a surge arrester occurs due to flashover, fault short current flows through the arrester and internal pressure of the arrester rises. The pressure rise can usually be limited by fitting a pressure relief diaphragm and transferring the arc from the inside to the outside of the housing. However, there is possibility of porcelain fragmentation caused by the thermal shock, pressure rise, etc. Non-fragmenting of the housing is the most desired way to prevent damage to other equipment. The pressure change which is occurred by flashover become discharge energy. This discharge energy raises to damage arrester housing and arrester housing is dispersed as small fragment. Therefore, the pressure relief design is requested to obstruct housing dispersion.

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Electrical Characteristics of ZnO Surge Arrester Elements Subjected to the Mixed DC and 60[Hz] AC Voltages (직류+60[Hz] 교류 중첩전압에 대한 ZnO 피뢰기 소자의 전기적 특성)

  • Lee, Bok-Hee;Yang, Soon-Man
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.26 no.4
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    • pp.41-47
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    • 2012
  • This paper deals with the electrical characteristics related to power loss, equivalent resistance, and leakage currents flowing through new and deteriorated zinc oxide(ZnO) arrester elements subjected to the mixed DC and 60[Hz] AC voltages. The test specimens were deteriorated by 8/20[${\mu}s$] impulse current of 2.5[kA]. The leakage current-applied voltage($I-V$) characteristic curves of ZnO surge arrester elements were measured as a parameter of the ratio of the peak of 60[Hz] AC voltage to the peak of total voltage. As a consequence of test results, in case of the same applied voltage, the leakage currents flowing through the deteriorated ZnO arrester elements were higher than those flowing through the new ZnO surge arrester elements. The cross-over phenomenon in $I-V$ curves of ZnO surge arrester elements measured as a parameter of the mixed ratio of DC and AC voltages was observed at the low current domain. The effect of DC voltage on the leakage current flowing through ZnO surge arrester elements is pronounced at the same magnitude of test voltages. In addition, the larger the applied number of 8/20[${\mu}s$] impulse current of 2.5[kA] is, the greater the power loss is, in particular, the more severe the power loss increases at higher applied voltages.