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This work aims at comparing results obtained from the DC Ramp test with the DC step test on the stator insulation of large hydro generators. Four cases of field measurements done on hydro generators are presented. Results are analyzed according to analytical solutions presented by the authors in recent publications for both methods. Quantities such as IR, PI, absorption current parameters and leakage...
In order to prevent forced outages of old generators, condition-based maintenance and diagnostic tests are periodically conducted on their stator insulation systems. The DC ramp test is easy to perform, involves a light material and has proven to be an effective and nondestructive means for reducing in-service stator failure. During a DC ramp test, the I-V curve is continuously recorded. A recently...
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