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The zero power factor curve (also zero power factor characteristic, ZPF, ZPFC) of a 
The ZPFC could be used together with the
The zero power factor curve (also zero power factor characteristic, ZPF, ZPFC) of a synchronous generator
An alternator (or synchronous generator) is an electrical generator that converts mechanical energy to electrical energy in the form of alternating current. For reasons of cost and simplicity, most alternators use a rotating magnetic field with ...
is a plot of the output voltage as a function of the excitation current
In electromagnetism, excitation is the process of generating a magnetic field by means of an electric current.
An electric generator or electric motor consists of a rotor spinning in a magnetic field. The magnetic field may be produced by per ...
or field using a zero power factor
In electrical engineering, the power factor of an AC power system is defined as the ratio of the ''real power'' absorbed by the electrical load, load to the ''apparent power'' flowing in the circuit. Real power is the average of the instantaneou ...
(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.
The curve is obtained by rotating the generator at the rated RPM
Revolutions per minute (abbreviated rpm, RPM, rev/min, r/min, or r⋅min−1) is a unit of rotational speed (or rotational frequency) for rotating machines.
One revolution per minute is equivalent to hertz.
Standards
ISO 80000-3:2019 def ...
with the output terminals connected to the unity load, varying the excitation field and recording the output voltage.
The ZPFC could be used together with the open-circuit saturation curve
The open-circuit saturation curve (also open-circuit characteristic, OCC) of a synchronous generator is a plot of the output open circuit voltage as a function of the excitation current or field. The curve is typically plotted alongside the synchr ...
in Potier Triangle method.
The zero power characteristic is similar to the open-circuit characteristic but shifted down by .
References
Electrical generators {{electric-stub