Analysis of ceramic varistor

Author

Suzuki, Masafumi ; Shibata, Sinetsu ; Itoh, Atsushi ; Yoshimura, Noboru

Author_Institution

Dept. of Electr. Eng., Akita Univ., Japan

fYear

1991

fDate

8-12 Jul 1991

Firstpage

655

Abstract

The frequency characteristics of the capacity and the dissipation factor of a ceramic ring varistor have been measured in the range from 10 kHz to 1 MHz. From the measurements, the equivalent circuit was determined, considering the internal structure of the ceramic ring varistor. The equivalent circuit contains three blocks, the grain boundary layer, the depletion layer, and the conduction layer. At the block of the conduction layer, only resistance is assumed, and at other blocks resistance and capacitance are assumed. The resistance and the capacitance of each block are 15 Ω and 6 nF, 10 Ω and 65 nF, and 0.5 Ω, respectively. Using the present equivalent circuit, transient phenomena have been studied. It is found that the decay time of the damped oscillation wave caused by RLC resonance can be controlled by the inductance and the winding resistance of a motor. It is also found that the period of the damped oscillation wave can be controlled by the resistance and the capacitance of the ceramic varistor

Keywords

ceramics; circuit oscillations; equivalent circuits; varistors; 0.5 to 15 ohm; 10 to 1000 kHz; 6 nF; 65 nF; RLC resonance; capacitance; ceramic ring varistor; ceramic varistor; conduction layer; damped oscillation; decay time; depletion layer; dissipation factor; equivalent circuit; frequency characteristics; grain boundary layer; internal structure; motor inductance; oscillation period control; resistance; transient phenomena; winding resistance; Capacitance; Ceramics; Electrical resistance measurement; Equivalent circuits; Frequency measurement; Grain boundaries; Inductance; Induction motors; Resonance; Varistors;

fLanguage

English

Publisher

ieee

Conference_Titel

Properties and Applications of Dielectric Materials, 1991., Proceedings of the 3rd International Conference on

Conference_Location

Tokyo

Print_ISBN

0-87942-568-7

Type

conf

DOI

10.1109/ICPADM.1991.172149

Filename

172149