With rotor threaded out, a detailed inspection of the various generator components such as stator core for signs of damage, burnt marks etc, laminations for looseness or shorts, wedge looseness, anti-corona shields, tie-ups, presence of contaminants, insulation peeling, heating signs, rotor poles for looseness/damage, brush arrangement etc. Visual inspection also includes the Knife test to detect stator core looseness and Endoscope observations to detect abnormalities deeper within the machine such as blockage of ventilating ducts, erosion of anti-corona shield in slots etc. These observations are supplemented with diagnostic test analysis to provide high accuracy.
Benefits:
Detection of abnormalities that are visible to the eye
Increased accuracy due to visual evidences
Detection of mechanical defects deep within the machine
Provides visual clues to problems identified in diagnostic tests.
