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Gas-Cooled Generator Applications of Fiber-Optic Distributed Strain and Temperature Sensors

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Gas-Cooled Generator Applications of Fiber-Optic Distributed Strain and Temperature Sensors

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Modern combined cycle power plants, with state-of-art gas turbines and steam turbines coupled to air-cooled or H2- cooled electrical generators, are highly refined technology concepts offering unmatched excellence in operation, reliability, and environmental friendliness. While generator core failures aren’t common, their potential impact is up to the catastrophic level. One yet-unsolved issue is the occasional development of hot spots in the stator core, where thousands of insulated carbon steel laminates are tightly pressed and clamped together. The insulation between laminations tends to degrade in service, and foreign objects and impacts during regular maintenance outages can damage the insulation as well. Damaged insulation can cause large Eddy currents to flow leading to core damage or forced outages as the hot spots proceed to heat up and damage the bar insulation.

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