Fixing method of generator air guide ring
Connection ring water leaks can degrade high-voltage insulation on the connection rings, result in stator winding hydraulic leakage (HIT SKID) test failures during test and inspection outages or after full stator rewinds, and extend test, inspection, and refurbishment outages to repair the leaks.
Connection ring water leaks can degrade high-voltage insulation on the connection rings, result in stator winding hydraulic leakage (HIT SKID) test failures during test and inspection outages or after full stator rewinds, and extend test, inspection, and refurbishment outages to repair the leaks.
This paper covers various types of generator fields, including both conventionally-cooled (indirect copper cooling) windings and direct-cooled copper windings as well as those with spindle and body mounted retaining rings. The options for rewinding, modifying, upgrading or uprating are provided for each field type.
Leaks in the generator water-cooled stator winding can affect machine availability and insulation life. The keys to minimizing the negative impact of a leak are early detection and timely repair. Routine leak testing of the stator winding is the best way to determine the existence of leaks.
Recent retaining ring inspections performed during routine generator maintenance have identified cases of surface pitting and degradation on a few 18-18 nonmagnetic retaining rings. Material analysis has shown that the insulation from the affected rings contained fire retardant chemicals, which can cause surface pitting and degradation.
Keep the gage at the tightest point, and turn the generator over to measure the air gap as the rotor turns. Minimum air gap is 0.035 inch. Check the air gap between the exciter armature and exciter stator. Measure completely around the gap between the exciter armature and exciter stator with a feeler gauge.
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