The generators in a marine vessel are reliable and require minimal maintenance; however, as the generator ages and because of the harsh operating and ambient environments shipboard generators will develop problems. Ship maintenance personnel need reliable advanced notice of when and where problems develop within the stator or rotor winding insulation system. Unfortunately, traditional off-line testing does not provide this, as tests are done as a part of planned maintenance and under abnormal operating conditions of mechanical, thermal, ambient and electrical stresses. Advances in on-line monitoring have proven effective in meeting the need of maintenance personnel with a Condition-Based Maintenance program for air-cooled generators in marine vessels.

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