Effect of Increasing Governor Setting on 100-kVA Generator Supplying 40kW Load

A 100-kVA generator supplying a 40 kW load operates with a governor designed to maintain engine rpm and thus stabilize AC frequency under varying load conditions. Increasing the governor setting while the load remains constant causes the engine speed to rise, resulting in an increase in output frequency. This frequency change can adversely affect connected AC loads, especially motors not equipped with variable frequency drives (VFDs), which will accelerate to a new speed. Voltage is typically regulated independently by a voltage regulator; if present and functioning correctly, voltage remains stable despite speed changes. Without voltage regulation, voltage will increase proportionally with speed. To increase power output without altering frequency, adjustments to fuel and air supply are made separately from governor rpm settings. The governor’s primary function is to maintain a set rpm against load variations, ensuring frequency stability.
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