Introduced in monitoring system of dielectric state of high voltage equipments with capacitive insulation, such as condensive bushings, current transformers, potential transformers and similar

摘要

A system and method for monitoring a dielectric state of high voltage equipment. A leakage current is measured and compared to a programmed limit value. An alarm is activated if the leakage exceeds the limit value to indicate that insulation has seriously deteriorated. The leakage current measurement is verified using a comparison of individual leakage currents with a change in a vector sum of leakage currents.