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Definition of "underexcited" |
a condition of operating a synchronous machine, in which the current to the DC field winding is insufficient to establish the required magnetic flux in the airgap.As a result, the machine requires reactive power from the AC system. An underexcited synchronous motor operates at a lagging power factor, as it appears as an inductive load to the AC system. An underexcited synchronous generator operates with a leading power factor, since it must deliver power to a leading (capacitive) system. |
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