Thermal Power Plants Turbine and Generator Maintenance Repair

• Coupling run-out check

• Disconnect coupling by taking the measurements of shell-shaft positions

• Dismantling bearing covers and pedestals and shells

• Withdrawing the rotor out

• Stator core test (ring flux test or ELCID test)

• Core tightness and bolt looseness check

• Wedge tightness test (by Wedge Tightness Tester or Hammer Method), replacement of wedges or tightening

• Check of end windings’ bandages and blocks looseness, tightening and fixing, bump test

• NDT tests (to fan blades, retaining rings, White metals, bearing seats…)

• Eddy Current Test to pipes of coolers (hydrogen coolers etc.)

• Manufacturing end (retaining) rings and replacement with new under ring insulations

• High speed balancing of rotors (at nominal speed) and overspeed tests

• Cleaning (by dry ice or cleaning chemicals) and drying rotor and stator

• Impregnation and polimerization

• Static tests (including RSO to rotor) to stator and rotor, evaluation the results and comments

• Insertion the rotor into stator and assembling,

• Assembling bearings and pedestals by providing lubrication clearances

• Measurement of bearing insulations

• Line alignment

• Commissioning, vibration measurement and analyse