What is not a function of a generator capability curve?

A generator capability curve is a graphical representation that illustrates the operational limits of a generator in terms of its output power (in megawatts) and reactive power (in VARs). Its primary functions include defining the thermal limits of the generator, which indicate the maximum continuous power output it can handle without overheating, and graphing the megawatt output, showcasing how much power the generator can produce under various conditions.

While the capability curve does address reactive power (VAR) limits, it primarily focuses on the operational range for both active and reactive power outputs, meaning it lays out the conditions under which a generator can operate effectively without exceeding its physical or performance limits. Voltage limits typically fall under the category of system stability and operational guidelines rather than being a direct output of the capability curve.

The correct choice is indeed that indicating voltage limits is not a function of the generator capability curve because the curve's purpose is more aligned with power output capabilities and not directly with voltage constraints. Thus, while voltage has an indirect relationship with generator performance, it is not represented directly within the capabilities illustrated on the curve.