Client is a leading paper & pulp industry. Their 35 MW generator rotor experienced heavy vibration during excitation and hence, were unable to load the generator. On inspection, the root cause of the issue was improper brazing of rotor windings. This was leading to contact between winding & end rings during rotation and hence, created faults in rotor and distortion on the magnetic flux resulting vibration while exciting the alternator Removing of rotor coils / windings & replacement of faulty windings. Complete re-insulation, static tests, before & after high speed dynamic balancing in Vacuum tunnel. Rotor has been commissioned and running successfully since May 2016. A series of tests were done in this process which included Resistance test, High frequency test @ 400HZ,

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