IEEJ Transactions on Fundamentals and Materials
Online ISSN : 1347-5533
Print ISSN : 0385-4205
ISSN-L : 0385-4205
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Volume 130, Issue 11
Displaying 1-13 of 13 articles from this issue
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Special Issue on 2009 Korea-Japan Joint Symposium on Electrical Discharge and High Voltage Engineering
Special Issue Paper
  • Distinctive Discharge Generated under Impulse Voltage and Negative Creeping Discharge along Aerial Insulated Cable
    Takaki Mizuno, Ryoichi Hanaoka, Toshiyuki Nishi, Shinzo Takata, Yasuno ...
    2010 Volume 130 Issue 11 Pages 993-998
    Published: November 01, 2010
    Released on J-STAGE: November 01, 2010
    DOIhttps://doi.org/10.1541/ieejfms.130.993
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    We investigated a negative creeping discharge traveling over the surface of insulated power cable under an applied lightning impulse voltage. The developing aspect of discharges was observed in detail using a camera equipped with an image intensifier and a high-speed image converter camera. In this paper, it is shown that the distinctive discharge with a positive polarity appears to a normal direction from the cable surface at the applied voltage more than ∼ 90 kVpeak. Negative creeping discharges are extended longer exponentially by the presence of such the positive discharge. The developing mechanism of the creeping discharge is discussed qualitatively based on the experimental results.
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  • Etching Characteristics of Fabricated Grooves on Silicon Solar Cell using Surface Discharge Plasma
    Toshiyuki Hamada, Tatsuya Sakoda
    2010 Volume 130 Issue 11 Pages 999-1003
    Published: November 01, 2010
    Released on J-STAGE: November 01, 2010
    DOIhttps://doi.org/10.1541/ieejfms.130.999
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    A buried contact is one of effective techniques to improve the efficiency of solar cells. However, the etching of the patterned front contact on the surface of a solar cell is required. Therefore, we proposed a maskless etching technique using the surface discharge plasma operated at atmospheric pressure. The streamer-like discharge channels, which ignited near a triple junction point between the quartz glass layer, the solar cell, and the gas space, played an essential role in the etching. The etching rate of a silicon solar cell of which the surface had randomly distributed pyramid-like structures, was in the range of 3 - 5 μm /min when the applied voltage was 4.0 kV.
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  • Decomposition Process of Benzene in a Low Pressure DC Glow Discharge
    Shinobu Hayashi, Kohki Satoh, Hidenori Itoh
    2010 Volume 130 Issue 11 Pages 1004-1008
    Published: November 01, 2010
    Released on J-STAGE: November 01, 2010
    DOIhttps://doi.org/10.1541/ieejfms.130.1004
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    The variations in the partial pressures of gaseous molecules produced by the decomposition of C6H6 in a low pressure DC glow discharge in N2/C6H6 and Ar/C6H6 mixtures are measured by the mass spectrometry. Also, rate equations for the partial pressure variations, which consider possible reaction among the gaseous molecules in the low pressure DC glow discharge, with the electrical energy-input, are proposed, and rate constants are determined by fitting the calculated partial pressure variations to the measured partial pressure variations. The rate constants deduced here indicate that C6H6 is mainly decomposed into an intermediate, which is regarded as a fragment of C6H6, the intermediate is decomposed into mainly C2H2, and then C2H2 is converted into H2 and HCN (only in N2/C6H6).
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  • Comparison of Degradation Phenomena on Silicone Rubbers Eroded by DC and AC Discharges
    Daiki Shiibara, Yoshihiro Arata, Tatsuya Sakoda, Masahisa Otsubo, Tomi ...
    2010 Volume 130 Issue 11 Pages 1009-1012
    Published: November 01, 2010
    Released on J-STAGE: November 01, 2010
    DOIhttps://doi.org/10.1541/ieejfms.130.1009
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    The salt fog tests for silicone rubbers (SiR) were performed under DC or AC voltage application. During a test, intensive discharges occurred around an earth electrode when positive DC voltage was applied. In the case of negative DC voltage application, intensive discharges occurred around an electrode which the voltage was applied. In other words, the intensive discharge concentrated around a cathode electrode, which caused heavy erosion around the electrode. In contrast, for the case of AC voltage application, the intensive discharge and heavy erosion did not occur.
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  • Discharges in Water and Applications to Wasted Water Treatment
    Chobei Yamabe, Takanori Yamashita, Satoshi Ihara
    2010 Volume 130 Issue 11 Pages 1013-1018
    Published: November 01, 2010
    Released on J-STAGE: November 01, 2010
    DOIhttps://doi.org/10.1541/ieejfms.130.1013
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    Recently the electrical discharge in water has been used for the water treatment. In this study, various shape of electrodes were examined to observe and measure the electrical discharge phenomena in water. Both the Marx generator and the pulsed power generator were used to generate the discharge in water. The oscillation on the waveforms of both applied voltage and discharge current was observed using the pulsed power generator whose peak applied voltage was about 80-120 kV and its discharge repetition rate was about one pulse per thirty seconds although it wasn't observed on the waveforms in the practical use of the high voltage generator (peak applied voltage was about 30-40 kV) with high repetition rate of discharge (20-300 pulses per second). Bubbles were introduced into the discharge region of main electrode using the ejector and the generation of hydroxyl radicals (OH) was confirmed by the measurement of emission spectrum of discharge in water and the intensity of OH radicals increased with the ratio of G/L (where, G is gas flow rate and L is water flow rate). The hydrogen peroxide (H2O2) was also measured and this reactor system was applied for the de-color of water.
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  • Creeping Discharge in PFAE Oil Traveling Over Pressboard Surface with Small Alien Substances
    Hironori Yamamoto, Sinsuke Otsuka, Ryoichi Hanaoka, Sinzo Takata, Naok ...
    2010 Volume 130 Issue 11 Pages 1019-1025
    Published: November 01, 2010
    Released on J-STAGE: November 01, 2010
    DOIhttps://doi.org/10.1541/ieejfms.130.1019
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    The effect of isolated small alien substances on the creeping discharge progressing the surface of the pressboard immersed in PFAE oil has been investigated using 1.2/1000 μs impulse voltages with ± 90 kVpeak in maximum. PFAE oil is new vegetable-based insulating oil which was recently developed as a substitute of mineral oil for environmental requirements. In this paper, it is shown that the creeping streamer is largely extended by the presence of isolated small alien substances in the surface or inside of the pressboard. The effect of such alien substances also appears in the streamer shape, discharge current and streamer velocity. These are discussed qualitatively on the basis of the experimental results.
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  • Proposal of Multi-pass Laser Spectroscopic Technique for Diagnosing Atmospheric Pressure Discharge Plasmas
    Tatsuya Sakoda, Mark D. Bowden
    2010 Volume 130 Issue 11 Pages 1026-1030
    Published: November 01, 2010
    Released on J-STAGE: November 01, 2010
    DOIhttps://doi.org/10.1541/ieejfms.130.1026
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    We propose a multi-pass laser spectroscopic technique which is useful for diagnosing atmospheric pressure discharges. The key to the technique is to recycle a single laser pulse with low energy many times through the measurement area, avoiding the perturbation that a high energy pulse would induce while maintaining large signal levels. The pulse from a Q-switched laser is injected into an optical cavity, and a Pockels cell is used to rotate the polarization of the beam 90°, trapping it in the cavity. We set up this laser system and successfully obtained a semi-infinite series of pulses.
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  • Studies on Acoustic Emission Signals Detected in an Oil-immersed Pole Transformer
    Takuya Yamamoto, Toshihiko Nakashima, Tatsuya Sakoda, Masahisa Otsubo, ...
    2010 Volume 130 Issue 11 Pages 1031-1036
    Published: November 01, 2010
    Released on J-STAGE: November 01, 2010
    DOIhttps://doi.org/10.1541/ieejfms.130.1031
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    Acoustic emission (AE) waves owing to partial discharges (PDs) in a 6 kV-oil-immersed pole transformer are influenced by windings, a magnetic core, and insulating paper because the AE waves proceed in all directions. To evaluate the amount of electrical charge due to a PD from AE signals detected by piezoelectric AE sensors, characteristics of AE signals obtained by arranging AE sensors at various positions were evaluated. We also investigated that the intensity ratio of frequency components of a detected AE signal was useful for estimating the rough location of a PD.
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  • Relationship between Leakage Current and Pollution Deposits on the Surface of Polymeric Insulator
    Takuma Miyake, Yuya Seo, Tatsuya Sakoda, Masahisa Otsubo
    2010 Volume 130 Issue 11 Pages 1037-1041
    Published: November 01, 2010
    Released on J-STAGE: November 01, 2010
    DOIhttps://doi.org/10.1541/ieejfms.130.1037
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    Application of polymeric materials used for housing insulators is considered. However, because polymeric insulator is organic matter, the aged deterioration is anxious. The lifetime of polymeric insulator is influenced by environmental conditions such as ultraviolet, acid rain, and polluted deposits. A change of the surface condition of polymeric material causes the dry band arc discharge and the discharge may lower the insulation strength. To investigate the relationship between insoluble pollution and occurrence of dry band arc discharge, we performed a salt-fog test with ethylene vinyl acetate (EVA) samples. The results showed that the heavy erosion caused by frequent dry band arc discharges occurred even in the case of a light polluted condition. Additionally, a very characteristic increase tendency in leakage current with a period of about 5 h was observed during the mist period.
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