| Title |
A Study on Development of High Voltage Mica Capacitors |
| Authors |
윤의중(Yun, Eui-Jung) ; 최철순(Choi, Cheal-Soon) ; 김재욱(Kim, Jae-Wook) ; 이동혁(Lee, Dong-Hyuk) |
| Keywords |
Epoxy-Mica Capacitor ; High Voltage ; Partial Discharge ; on-line Detection Method ; Temperature Cycling Test |
| Abstract |
In this work, ultra high-voltage (17 - 50 kV AC), reliable 80 pF mica capacitors for partial discharge system application were investigated. Mica was used as the dielectric of the capacitors. Using the conservative design rule, over 3 individual 50 μm thick mica sheets with a size of 30mm×35mm were used with lead foils to form a parallel capacitor element and 20 mica sheets were interleaved with lead foils to form a series stack of parallel capacitor element to meet the requirements of the capacitors. The dimensions of the fabricated 80 pF capacitors for 17 kV AC and 50 kV AC were 90 mm×90 mm and 95 mm×180 mm, respectively. The high-frequency characteristics of the capacitance (C) and dissipation factor (D) of the developed capacitors were measured using a capacitance meter. The developed capacitors exhibited C of 79.5 - 87.5 pF, had D of 0.001% over the frequency ranges of 150 kHz to 50 MHz, had a self-resonant frequency of 65 MHz, and showed results comparable to those measured for the capacitors prepared recently by Adwel^{Tm}. The developed capacitors also showed excellent characteristics for thermal shock test and temperature cycling test. |