Measurement of partial discharges in bushings and instrument transformers following an applied potential test should preferably be made on the basis of measurement of the apparent charge. Relevant measuring systems are classified as wideband or narrowband systems. Both principles are recognized and widely used. Without giving preference to one or the other, this document describes the measurement circuits related to the wideband method.This guide describes the test procedure for the electrical measurement of partial discharges (PDs) occurring in Bushings and Instruments Transformers during AC dielectric tests. General principles of PD measurements, including the narrowband method, are covered in IEC 60270 "High-voltage test techniques - Partial discharge measurements".
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