When two generators are operating in...

Question 1 / 270705eccefa4bacbc34ba4d48185

Question 1 of 270705eccefa4bacbc34ba4d48185

When two generators are operating in parallel, what will first occur if the engine driving generator #1 suddenly loses power?

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Question 1 of 27070

When two generators are operating in parallel, what will first occur if the engine driving generator #1 suddenly loses power?

🔍 Key Concepts

• Parallel operation of AC generators and how load is shared between them • What reverse power means in a generator system (generator acting as a motor) • Sequence of events when a prime mover (diesel engine) loses power but the generator is still connected to a live bus

💭 Think About

• If generator #1’s engine loses power, what happens to its torque and ability to drive the generator compared to generator #2? • When two generators are synchronized and one stops producing power, which direction does power flow for that unit and what protective relay would see that first? • Think about what condition must exist for an overload trip versus a reverse power trip—does the weak unit draw power or supply more power?

✅ Before You Answer

• Verify what reverse power protection is designed to detect on a generator connected in parallel • Check whether an overload trip would occur on the weak generator or on the healthy one when one prime mover loses power • Confirm which protective device typically acts first when a paralleled generator starts being driven as a motor by the system

Question 1 of 27070

When two generators are operating in parallel, what will first occur if the engine driving generator #1 suddenly loses power?

Generator #1 circuit breaker will trip on overload.

Generator #1 circuit breaker will trip on reverse power.

Generator #2 will motorize.

Generator #2 engine will automatically shut down.

Question 1 / 270705eccefa4bacbc34ba4d48185

Question 1 of 270705eccefa4bacbc34ba4d48185

When two generators are operating in parallel, what will first occur if the engine driving generator #1 suddenly loses power?

Back

Question 1 of 27070

When two generators are operating in parallel, what will first occur if the engine driving generator #1 suddenly loses power?