The crossing of two critical speeds can be seen clearly. Also the phase change is very similar to the Jeffcot behaviour.
| The figure
is relative to a 600 megawatt generator run down from the normal operating
speed which is 3000 rpm down to very low speed. This transient from 3000
up to 300 rpm was performed in half an hour. The crossing of two critical speeds can be seen clearly. Also the phase change is very similar to the Jeffcot behaviour. |
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