In over compounded generator, full load terminal voltage is

Compounding: In a compound generator, the field winding is a combination of a shunt winding (connected in parallel with the armature) and a series winding (connected in series with the armature).
Over-Compounding: In an over-compounded generator, the series field winding is designed to significantly boost the voltage at full load.
Voltage Rise: As the load current increases, the current through the series winding also increases, producing a stronger magnetic field. This stronger field induces a higher voltage in the armature, leading to a higher terminal voltage at full load compared to no-load.
Visual Representation:
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overcompounded DC generator

Key Points:

Over-compounded generators are used in applications where a constant voltage is desired at the load, even as the load current varies.
Common applications include supplying power to long transmission lines or locations far from the power source.