As shown in the illustrated alternator...

Question 1 / 205eccefa4bacbc34ba4d4847d

Question 1 of 205eccefa4bacbc34ba4d4847d

As shown in the illustrated alternator protection scheme diagram, what function does the reverse power relay (RP) perform? See illustration EL-0067.

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Question 1 of 20

5eccefa4bacbc34ba4d4847d

As shown in the illustrated alternator protection scheme diagram, what function does the reverse power relay (RP) perform? See illustration EL-0067.

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🔍 Key Concepts

• Reverse power condition in an alternator connected in parallel with a bus • Difference between an alternator supplying power to the bus and an alternator motoring from the bus • How the RP relay is connected in the diagram relative to current transformers (CTs) and the bus

💭 Think About

• Look at the power flow: under a healthy condition, in which direction should real power flow between the generator and the bus, and what happens electrically if the prime mover torque is lost? • In the diagram, the RP relay is sensing current and voltage. What change in kW (real power) and its direction would cause this relay to operate? • Which option describes an electrical power-flow problem (kW direction) rather than a mechanical reversal or field polarity issue?

✅ Before You Answer

• Verify which choice specifically mentions the generator acting as a motor instead of a source. • Check which options are actually protected by other relays in a standard protection scheme (phase sequence, field polarity, mechanical reverse rotation) rather than by RP. • Confirm from the illustration that RP is tied into the fault trip line that responds to abnormal power flow direction, not to phase sequence or field polarity.

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Question 1 of 20

As shown in the illustrated alternator protection scheme diagram, what function does the reverse power relay (RP) perform? See illustration EL-0067.

trips the alternator circuit breaker when the alternator phase sequence is opposite that of the bus

trips the alternator circuit breaker when the alternator main field polarity is reversed

trips the alternator circuit breaker when the alternator begins to motorize

trips the alternator circuit breaker when the alternator prime mover is being driven in the reverse direction

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Question 1 / 205eccefa4bacbc34ba4d4847d

Question 1 of 205eccefa4bacbc34ba4d4847d

As shown in the illustrated alternator protection scheme diagram, what function does the reverse power relay (RP) perform? See illustration EL-0067.

Back

Question 1 of 20

5eccefa4bacbc34ba4d4847d

As shown in the illustrated alternator protection scheme diagram, what function does the reverse power relay (RP) perform? See illustration EL-0067.

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

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