• Title, Summary, Keyword: Streaming electrification

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Effect of the Addition of Benzotriazole on the Streaming Electrification Properties in Transformer Oil

  • Shin, Jong-Yeol;Hong, Jin-Woong
    • Transactions on Electrical and Electronic Materials
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    • v.11 no.6
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    • pp.288-291
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    • 2010
  • Accidents can occur as a result of streaming electrification when transformer oil is used as an insulating oil in large ultra-high voltage transformers. Methods for adding a streaming electrification inhibitor to reduce the streaming electrification has been studied extensively. In this paper, in order to develop a method for reducing streaming electrification effectively, 4 different specimens were prepared by the addition of benzotriazole (BTA) to a virgin specimen with constant stirring. The specimens were examined to determine the appropriate amount of BTA addition that would suppress the streaming electrification most effectively. The results showed that the streaming electrification characteristics of the specimen in the streaming transformer oil were best when the amount of BTA addition was about 10 ppm. The streaming electrification current was reduced by adding 30 ppm BTA until the temperature reached $65^{\circ}C$. The polarity of the streaming electrification current was negative when the temperature exceeded $65^{\circ}C$. Therefore, the streaming electrification current, which can be a cause of transformer accidents, can be suppressed in large ultra high voltage transformer oil. This paper reports on the optimal amount of BTA addition and the best conditions for controlling the streaming velocity of transformer oil.

The Effect of Additive on the Streaming Electrification (첨가제의 영향에 따른 유동대전특성 조사)

  • 최창락;임헌찬;박재윤;정재희;성낙진;이덕출
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.357-360
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    • 1995
  • Since the streaming electrification phenomena of transformer were made clear on 1970s, many researches have been continued on the improvement of the transformer. This paper describes the effect of additive (BTA, DBPC) and temperature on the streaming electrification of the various materials. The streaming current in the various materials decreases in proportion to the concentration of BTA, results in the inverse electrification. We believe that these results will contribute to the optimal design of HV large-capacity transformer.

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Electrification Tendency of Oil Adding Moisture and Dust (수분 및 머지의 첨가에 따른 절연유의 대전경향)

  • 김두석;권동진;강창구
    • The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.6 no.5
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    • pp.50-56
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    • 1992
  • This paper presents the effect of moisture and dust on streaming electrification in transformer oil, in order to investigate the electrification tendency of oil adding moisture an dust. Authors designed series electrification device to analyse streaming electrification phenomena easily. Experimental results show that the streaming current is linearly increased with oil velocity and it has a peak value at about a 50 [%]. Adding of moisture and dust in oil decreased charging level and it was dominant in case of moisture.

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A study on the effect of solid materials on the streaming electrification of insulating oil (절연유의 유동대전에 미치는 고체재질의 영향에 관한 연구)

  • 김용운;임헌찬;김영일;김영봉;이덕출
    • Electrical & Electronic Materials
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    • v.7 no.3
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    • pp.236-242
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    • 1994
  • In this paper, the streaming electrification characteristics of insulating oil were examined when the oil is contacted with solid materials in a circulating system. The streaming current($I_s$) increases with increasing oil velocity and temperature, and electrification properties depend on species of metal materials. $I_s$ in the gauze-contained electrification apparatus increases with increasing oil temperature below the temperature of 43[>$^{\circ}C$], but decreases above 43[>$^{\circ}C$]. On the other hand, $I_s$ is positive electrificated for the pipe of Fe, Cu, while it is negative electrificated for Sus. When insulating oil flows through a car fuel filter, $I_s$ increases linearly with increasing oil temperature.

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Analysis of Characteristics on the Static Electricity by Streaming Electrification (유동대전에 의한 정전기 특성 분석)

  • Kim, Gil-Tae;Lee, Jae-Keun
    • Journal of the Korean Society of Safety
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    • v.20 no.3
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    • pp.42-46
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    • 2005
  • The static electricity by thinner flow and discharge energy is investigated experimentally for the purpose of preventing the electrostatic discharge and damage. Test system for evaluating streaming electrification consists of a teflon pipe, a reservoir tank a pump, flowmeters and an electrometer. When dielectric liquid flows through a pipe from one vessel to another, the potential difference generated in the collecting vessel is due to the accumulation of charges. These charges result from the convection of a part of the electrical double layer existing in the tube at the contact between the liquid and the inner wall. When the fluid velocity increases, the electric current increases proportionally. The charging current and accumulated charges by streaming electrification at the thinner velocity of 40cm/s are measured a range of 5 nA and $0.27{\mu}C$ respectively. This amount of static discharge energy generated by streaming electrification is enough to ignite flammable solvent. Therefore surface electric potential should decrease by using electrostatic shielding and ground.

Streaming Electrification of Pressbord by Oil Path Form (유로형상에 의한 절연지의 유동대전 특성)

  • 이동훈;최창락;박재윤;이충식;고희석;이덕출
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.332-335
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    • 1995
  • Electrification pipe modeled on the oil path of the high power transformer is designed and manufactured. Distributions of oil flow velocity are simulated as spacer form in the electrification pipe. Streaming currents are investigated as each electrification pipe. The surface oil velocity of spacer is small the streaming current.

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DC Field Effect on Streaming Electrification in Insulating Oil (절연유의 유동대전특성에 미치는 직류전계의 영향에 관한 연구)

  • Chung, K.H.;Kim, Y.W.;Kim, D.S.;Hwang, L.H.;Lim, H.C.;Park, J.Y.;Kim, J.T.;Lee, D.C.
    • Proceedings of the KIEE Conference
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    • pp.1436-1437
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    • 1998
  • In this paper, the result of experimental investigation into the streaming electrification phenomena of insulating oil under an external dc field effect is described. Energization by positive dc voltage enhanced the streaming electrification. but when the applied voltage was negative, the polarity of streaming current was field strength dependent.

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Characteristics of Static Electrification on Insulation Oil Aging (변압기 절연유의 열화에 따른 대전특성)

  • Kweon, Dong-Jin;Kim, Han-Sang;Chong, Yong-Ki;Kim, Kyoung-Wha;Kim, Du-Seok;Kwak, Hee-Ro;Park, Tong-Wha
    • Proceedings of the KIEE Conference
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    • pp.1615-1618
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    • 1994
  • This paper studied the streaming electrification of the U.H.V. transformer with the spinning cylinder system, and compared and analyzed it with the conventional forced flowing system which uses a pump or gas for oil flowing. Also, accumulated surface voltage in its electrified material was measured with the electrostatic voltmeter, and the effect of insulation oil aging was measured. As results, in spinning cylinder system, characteristics of the streaming electrification to its rotational speed and oil temperature are same tendency as those of tile forced flowing system and it showed the spinning cylinder system is useful to study the streaming electrification. And, aging of insulation oil increases the electricity of streaming electrification at initial stage of aging.

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A Study on the Preventive Method of Accident by Streaming Electrification in UHV Transformer (UHV변압기에서 유동대전에 의한 사고 방지에 관한 연구)

  • 박재윤;고희석
    • The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.6 no.5
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    • pp.38-44
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    • 1992
  • In this paper, electrification pipe modeled on the oil path that insulating oil flow in the high power transformer is manufactured in order to prevent the accident cause from streaming electrification generated when insulating off flow at a solid-liquid interface, and the streaming current is measured and analyzed according to the shape of oil path in electrification pipe. From the result of this study, the streaming current increases linearly with increasing of a oil velocity and it increases at lower temperature and decreases at higher temperature than [$46^{\circ}C$]. The smoother the flow of insulating oil is the more the streaming current decreases.

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Electrification tendency of oil adding dust (먼지의 첨가에 따른 절편유의 대전경향)

  • 곽희로;김두석;권동진;조국희
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • pp.60-63
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    • 1992
  • This paper presents the effect of moisture and dust on streaming electrification in transformer oil, in order to investigate the electrification tendency of oil adding moisture and dost. Authors designed series electrification device to analyse streaming electrification phenomena easily. Experimental results show that adding of moisture and dust in oil decreased charging level and it was dominant in case of moisture.

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