Zero power factor curve

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The zero power factor curve (also zero power factor characteristic, ZPF, ZPFC) of a synchronous generator is a plot of the output voltage as a function of the excitation current or field using a zero power factor (purely inductive) load that corresponds to rated voltage at rated current (1 p.u.). The curve is typically plotted alongside the open-circuit characteristic.

Obtained by measuring the terminal voltage when the current has a zero power factor current using a pure inductive load that could be regulated to compensate the reactive power of the generator EMF.^[1]

The curve is obtained by rotating the generator at the rated RPM with the output terminals connected to the unity load, varying the excitation field and recording the output voltage.^[discuss]

The ZPFC could be used together with the open-circuit saturation curve in Potier Triangle method.

The zero power characteristic is similar to the open-circuit characteristic but shifted down by ${\displaystyle \alpha }$.^{[clarification needed]}

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