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Generator rotor thermal sensitivity is a phenomenon found on the generator rotor causing change in vibration as the field current is adjusted. Thermal Sensitivity Testing The test is conducted to prove whether the vibration problem is caused by field current changes or prime mover force changes. Vibration changing as a function of megawatt loading is not a thermal sensitivity mechanism [1]. The two generators did not involve the test under constant field current due to certain constraints but they were investigated under the constant megawatt. DIAGNOSIS TESTING The operational condition monitoring and online thermal sensitivity testing were performed on both generators in order to diagnose the severity of the problem. INSPECTION RESULTS The generator SB-C22 was shut-down in order to conduct the repair work on the rotor. The migrated parts are slot armorisseur, leaf spring, creepage block and sub slot cover. The root cause analysis done by GEPS Energy Services concluded that the leaf spring contributed to the vent holes plugging and it caused the thermal sensitivity [2]. REPAIR WORK The repair work of the generator SB-C22 was done by total field rewinding including corrective action which is applied. After the repair work, thermal sensitivity investigation was performed when the unit starts and the test was repeated three month later. The result indicated that generator had been operating without thermal sensitivity problem.

Tags : vent holes, vibration problem, root cause analysis, operational condition, force changes, leaf spring, condition monitoring, energy services, rotor, corrective action, generators, severity, constraints, phenomenon, diagnosis

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