A Possible application of Pockels Sensor for detecting Partial discharge in GIS using artificial defect

摘要

For more than two decades, various techniques have been employed in order to detect partial discharges occurring inside power apparatus. They have been based on the conventional direct detecting systems by means of electrical or ultrasonic sensors. For the former, there are different types of current measurement using neutral lines of the transformer in order to detect the current pulses accompanied by the PDs generated at the bushing. In addition, ultrasonic sensors conglutinated on the enclosure of power apparatuses are used for the latter. Regardless of their acceptable sensitivity, certain technical inconveniences have been reported as follows: multistage amplification, large volume, external noise susceptibility, high price and low on-site applicability.