Calibration of Partial Discharge Magnitude for In-service Hydro-power Generator

Abstract

Hydro-power Generator have many Resistive Thermal Detectors (RTD) which is used to detect over heating of insulation materials for generator stator windings.
By using RTD as the coupling capacitors, In-service Partial Discharge Detection for the insulation diagnosis was studied. For the quantitative treatment of the detected partial discharge, calibration method was developed to utilize calibration data obtained at the periodical insulation diagnosis under off-service condition.