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We investigated the features of defects on the rod and the "rod–end-terminal" contact of polymer and porcelain insulators using the developed integrated method for noncontact remote diagnostics of the performance of high-voltage insulators, including the initial detection of local areas with elevated electric-field gradients and the measurement of the set of characteristics of partial discharges. The emission of extra-large partial discharges was discovered, and their features were studied. Based on the measurement results, a diagram was constructed for electrophysical processes accompanying the emission of extra-large partial discharges, and their causes were established. [ABSTRACT FROM AUTHOR]

The technical condition of high-voltage insulators was inspected for the first time at several substations of OAO "Kazanskie elektricheskie seti" (Kazan Power Grid PLC) using the previously developed two-channel remote method for measuring the characteristics of partial discharges. Based on the results of preliminary bench tests with model samples and field measurements of a set of partialdischarge parameters and on computer-aided analysis of these results, diagnostic features have been established that make it possible to determine the type and location of the most dangerous defects and the degree of their influence on the operability of the insulators. [ABSTRACT FROM AUTHOR]