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I performed a Meg Ohm Test in several oppoortunities the stator and rotor of a hydrogen cooled generator (13.8 kV / 66 MW). Always with the rotr desacopled from the stator. Last week the test was performed with the generator totally mounted and with the hydrogen presurized (59oF / 28 PSIG). What criteria must I take to analyze the results? The hydrogen has a more or less capacitive behavior than air? Is the same, perform the test with hydrogen or air? The results indicates that the insulation levels are below the historical results of this machine. Thanks in advance for any clue !!! R. Ugarte
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