Distinction of asymmetric load from eccentricity or synchronous electric generator winding fault using search coil measurements

Forces acting on the stator teeth of the 400 kVA, 4 pole synchronous generator were analyzed for asymmetric electric load conditions. Measurement of the flux density was performed with the measuring coils installed on the stator teeth and calculations were done by Finite Element Method. The measured data was processed to determine the radial forces of the stator teeth through Maxwell stress tensor integration algorithm. The processed data was used for detection of asymmetric load condition. The methodology for distinction of the asymmetric load from the eccentricity or winding fault is presented. The parameters of the measuring coil sensors and their adequate position can be determined with Finite Element calculation before performing sensor installation on the machine.