Features of monitoring extra large partial discharge in high voltage insulators

Abstract

THE PURPOSE of the described study is to study the effect of partial discharges on the physical state of previously detected defects in high-voltage insulators. The article describes the results obtained by a complex of non-contact methods for remote diagnostics of high-voltage insulators under operating voltage during operation using a two-channel remote diagnostic device.METHOD is based on the registration of partial discharges by electromagnetic and acoustic sensors. With the help of electromagnetic and acoustic sensors, the characteristics of partial discharges in high-voltage polymer and porcelain insulators were studied without contact in laboratory and field conditions. The developed monitoring system is largely based on the discovered effect of extra large PDs, which create an accumulation of induced electric charges on the dielectric surfaces of defects, which form electric fields with a strength exceeding the strength of the applied fields to high-voltage insulators.THE RESULTS of experimental studies confirm the possibility of industrial applicability of the proposed method for non-contact remote diagnostics of the state of high-voltage insulators under operating voltage. The use of acoustic registration of partial discharges in the control of defects makes it possible to more accurately determine the total number of PDs and their phase distribution.

Keywords

• remote diagnostics
• partial discharges
• non-destructive testing
• high-voltage insulators
• insulation defects
• monitoring system