When a high voltage system insulation test...

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Question 1 of 205eccefa4bacbc34ba4d48432

When a high voltage system insulation test value is suspect or recorded during an annual survey, a polarization index test is performed. What is the polarization index?

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5eccefa4bacbc34ba4d48432

When a high voltage system insulation test value is suspect or recorded during an annual survey, a polarization index test is performed. What is the polarization index?

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🔍 Key Concepts

• Insulation resistance testing on high voltage systems using a megohmmeter (megger) • How insulation resistance changes over time when a constant DC test voltage is applied • The definition of polarization index (PI) as a time-based ratio, not a single reading

💭 Think About

• When you apply a DC voltage for an extended period, does the insulation resistance usually increase, decrease, or stay the same? How does that relate to the two times used in PI? • Look carefully at which answer choices put the later time reading in the numerator and which put the earlier time reading in the numerator. Which makes sense if good insulation improves (stabilizes higher) with time? • Which option incorrectly treats polarization index as just a single resistance value instead of a ratio of two readings?

✅ Before You Answer

• Confirm that PI is always a ratio of two insulation resistance values, not a standalone reading. • Verify which specific times are standard for PI in marine/high-voltage practice (you should recognize them from standard megger test procedures). • Make sure the larger time interval (better-stabilized reading) is appropriately compared to the shorter time interval so that a healthy system yields a PI value greater than 1.

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Question 1 of 205eccefa4bacbc34ba4d48432

When a high voltage system insulation test value is suspect or recorded during an annual survey, a polarization index test is performed. What is the polarization index?

Back

Question 1 of 20

5eccefa4bacbc34ba4d48432

When a high voltage system insulation test value is suspect or recorded during an annual survey, a polarization index test is performed. What is the polarization index?

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