Two AC generators are operating in parallel...

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Question 1 of 205eccefa4bacbc34ba4d481cf

Two AC generators are operating in parallel and both are equipped with automatic voltage regulators. While standing watch, one generator is noted as having a greater lagging kvar value. In order to equalize the kvars between the generators manually, what should be done?

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🔍 Key Concepts

• Reactive power (kvar) sharing between generators in parallel • Effect of automatic voltage regulators (AVRs) on reactive power vs. governor speed control on real power (kW) • Relationship between terminal voltage and power factor / kvar flow in parallel AC generators

💭 Think About

• When two generators are in parallel, which control (speed governor or voltage regulator) is primarily responsible for changing kW load and which is responsible for kvar / power factor? • If one machine is carrying more lagging kvar, what change would you make to its terminal voltage relative to the bus to reduce its reactive power contribution? • Think about what happens to kvar sharing if you raise the voltage on one generator while keeping the other constant, versus lowering it.

✅ Before You Answer

• Verify which adjustment affects real power (kW) versus reactive power (kvar) when generators run in parallel • Confirm that increasing generator terminal voltage tends to increase lagging kvar load carried by that generator • Confirm that the correct manual action must involve changing voltages, not speeds, to balance kvar sharing

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