A MICROCOMPUTER CONTROLLED HIGH-VOLTAGE CAPACITANCE AND DISSIPATION FACTOR MEASURING BRIDGE

Abstract

A self-balancing bridge to measure the capacitance and the dissipation factor of high- voltage insulating materials has been developed. The bridge uses a current comparator working in current transformer mode, thus the convergence trajectory is linear, which makes the balancing procedure simple and fast. The accuracy of the bridge is better than 10 -4 for capacitance and 2· 10- 5 for tg<5 measurements. The measuring speed of the instrument is about one measurement pro second.