Governor Droop - Speed vs Load

Engine speed drop with load under a given governor droop setting - baseline for generator paralleling and load-sharing.

GovernorDroopEngine

No-load frequencyHzFull-load frequencyHzActual load%

Droop: 0.67%

Frequency at load: 60.12Hz

Changing the inputs requires JavaScript. The calculator above shows its default inputs and result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

\text{droop} = \frac{f_0 - f_{full}}{f_{full}}

Symbol	Meaning	Unit
$f_0$	No-load frequency	Hz
$f_{full}$	Rated load frequency	Hz

Source: Woodward - Governor Fundamentals

In short

Engine speed drop with load under a given governor droop setting - baseline for generator paralleling and load-sharing.

Learn the theory Engine Performance Monitoring: PMI Systems