As shown in the illustrated alternator...

Question 1 / 205eccefa4bacbc34ba4d48474

Question 1 of 205eccefa4bacbc34ba4d48474

As shown in the illustrated alternator protection scheme diagram, what device provides input to the reverse power relay "RP", the under voltage/overvoltage relay "UV/OV", and the under frequency/over frequency relay "UF/OF"? See illustration EL-0067.

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🔍 Key Concepts

• Current transformer (CT) vs potential transformer (PT) functions in generator protection • Which electrical quantity each relay needs to sense: reverse power, under/overvoltage, under/overfrequency • How the relays in the diagram are physically connected to the CTs or PTs

💭 Think About

• Look at the wiring in the illustration: from what device do the lines feeding the RP and UV/OV UF/OF relays originate? • Ask yourself which measurement is required for under/overvoltage and under/overfrequency protection: is it current or voltage? • For a reverse power relay, which input is normally taken from instrument transformers so the relay can detect power flow direction?

✅ Before You Answer

• Trace the connection lines from RP and UV/OV UF/OF back to the common source; note if they tie into the symbol labeled PT or one of the CTs. • Confirm which transformer type is used to step down system voltage for metering and protection. • Eliminate options that do not appear anywhere in the schematic (e.g., strobe sensors) before choosing between CT and PT.

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Question 1 of 20

current transformer

potential transformer

thermal monitor sensors

strobe sensors

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Question 1 / 205eccefa4bacbc34ba4d48474

Question 1 of 205eccefa4bacbc34ba4d48474

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Question 1 of 20

5eccefa4bacbc34ba4d48474

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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