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hgis hvdc converter transformer leakage test

MAINTENANCE OF HVDC EQUIPMENT - USAID SARI/Energy …· PDF fileConverter Transformer Following tests are done during yearly shutdown Capacitance and tan δof the bushings Used to determine the healthiness of the bushing insulation Checking the operation of the buchholzrelays and Pressure Relief Devices (PRD) Checking of the WTI & OTI alarms and trips Checking whether all the alarms are reported to HMI system

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