As shown in the illustrated alternator...

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Question 1 of 205eccefa4bacbc34ba4d48465

As shown in the illustrated alternator protection scheme diagram, what function does the negative phase sequence relay (NPS) perform? See illustration EL-0067.

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Question 1 of 20

5eccefa4bacbc34ba4d48465

As shown in the illustrated alternator protection scheme diagram, what function does the negative phase sequence relay (NPS) perform? See illustration EL-0067.

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🔍 Key Concepts

• Negative phase sequence (NPS) currents and what typically causes them in a 3‑phase alternator • Difference between short‑circuit overcurrent protection and unbalanced current protection • How time‑delay overload relays usually relate trip time to the size of the overload current

💭 Think About

• Look at where the block labeled "OCIT OC (inst) NPS" is connected in the diagram. What are the current transformers (CTs) measuring there: total current magnitude, or the balance between the three phase currents? • Which of the options describes a condition that would exist even if all three phase currents were equal, and which option describes a condition where one or more phase currents differ from the others? • Think about what negative phase‑sequence currents physically do to the rotor of an alternator. Does that relate more to general overload, to a high fault current, or to unbalanced stator currents?

✅ Before You Answer

• Identify which choice mentions unbalanced phase or stator currents – this is closely related to negative phase‑sequence conditions. • Separate functions: which protection would be handled by an instantaneous overcurrent relay versus a specialized NPS relay? • Verify which answers talk about time‑delay overload (trip time vs. current) – that is usually handled by thermal or inverse‑time overcurrent relays, not NPS.

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Question 1 of 205eccefa4bacbc34ba4d48465

As shown in the illustrated alternator protection scheme diagram, what function does the negative phase sequence relay (NPS) perform? See illustration EL-0067.

Back

Question 1 of 20

5eccefa4bacbc34ba4d48465

As shown in the illustrated alternator protection scheme diagram, what function does the negative phase sequence relay (NPS) 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

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed