Chapter 15

Generator Drying Out and Air-Tightness Tests


A generator converts mechanical energy into electrical energy. Insulation on generator winding prevents winding faults and current flow between conductors and stator or rotor. The service life of a generator depends on the condition of insulation. Insulation resistance (IR) measures conductivity of insulation system, and polarization index indicates drop in IR value over time. Air/hydrogen is circulated to dissipate heat generated in the generator enclosure. Heat generated in stator winding is dissipated by circulating DM water. Seal oil prevents leakage of hydrogen through shaft seals. Generator drying out removes moisture film on the insulation surface of generator stator ...

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