On-line transformer diagnostic methods synergy based on discharge and vibration events measurements and location

This paper discusses power transformer diagnostics including PD (partial discharge) location and measurements, vibration events analysis and location, infrared control, gas-in-oil analysis. Diagnostic results are reviewed in this paper for a group of transformers taking a methods synergy as the basis; the following becomes revealed: - correlation of vibration events and discharges (sparking) in insulation of magnetic core, case No1; - influence of transformer load on discharge (sparking) initiation and vibration events in magnetic core (during load increase both events disappear) case No2; - correlation between vibration events in winding and gas-in-oil analysis results (with zero PD events and thermal anomalies) case No3. Obtained results appear to be vital for the equipment repair scheduling.