Pattern analysis of turbine generators on-line discharge zone location in winding

Abstract

Condition-based maintenance for turbine generators (TG) is given in the paper. Defects in stator winding and in magnet core are determined before repair on the basis of double-coordinate on-line discharge events location. Full information about ground wall semiconductivity layer in bars, slot discharges, sparking between plates in magnet core are provided by generators measurements operating load from Wmin. to Wmax. Defect diagnostics have affirmed the forecasted failures: 1) migrating iron particles were detected through location and were registered protractedly by in-service installed continuum monitoring system for TG; 2) sparking in core located; 3) partial discharges (PD) located; 4) slot discharges located. The quality of the repair work has been monitored by the double-coordinate location and operating load variation, tests have confirmed defect absence.