• Title/Summary/Keyword: DC BDV

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Dielectric Breakdown Voltage and Dielectric Properties of High Voltage Mutilayer Ceramic Capacitor with C0G Temperature Coefficient Characteristics (C0G 온도계수 특성을 가지는 고압용 적층 칩 캐패시티의 유전 및 내전압 특성)

  • Yoon, Jung-Rag;Woo, Byong-Chul;Chung, Tae-Serk
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.21 no.2
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    • pp.137-143
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    • 2008
  • High voltage MLCCs with C0G temperature coefficient characteristics could apply DC-DC invertor were investigated for its dielectric properties. Also we manufactured MLCC through various process and studied the characteristics of dielectric break down voltage [BDV] and dielectric property as the variation of thickness in the green sheet and how to pattern the internal electrode. As the thickness of green sheet is increase, the dielectric BDV per unit thickness is decreased. But as the pattern of internal electrodes were floated we could manufacture the high voltage MLCC maintained its dielectric BDV a unit.

Shape and Dielectric Strength of Thermal Bubbles in Liquid Nitrogen (액체질소 중 열기포 형상 및 절연 특성)

  • Baek, Seung-Myeong;Kim, Hae-Jong
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.28 no.5
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    • pp.326-331
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    • 2015
  • In this paper, we study the insulating properties of the liquid nitrogen(LN2) including the thermal bubbles. The shape of the thermal bubbles in accordance with the current change was observed in the 77 K and 65 K LN2. According to the temperature of liquid nitrogen, bubbles were generated differently. The round shape of the bubble is occurred in 77 K LN2. But the layer shape of bubble is occurred in 65 K LN2. When the bubbles present, the dielectric strength of liquid nitrogen is low. However, the breakdown patterns were different according to the electrode arrangement. AC breakdown voltage(BDV) was lower than the DC BDV due to the influence of bubbles. Therefore, the design of a high-voltage superconducting equipments should consider the bubbles.