When testing insulation resistance of...

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Question 1 of 205eccefa4bacbc34ba4d4841a

When testing insulation resistance of electric equipment and machinery, ideally when should the insulation resistance be tested for the lowest normal insulation values?

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5eccefa4bacbc34ba4d4841a

When testing insulation resistance of electric equipment and machinery, ideally when should the insulation resistance be tested for the lowest normal insulation values?

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🔍 Key Concepts

• Insulation resistance behavior in motors and generators as temperature changes • Effect of machine operating temperature (hot vs cold) on measured insulation resistance • Best time in the operating cycle to see the lowest normal insulation value without indicating damage

💭 Think About

• Does insulation resistance usually go up or down as the temperature of the windings increases? • At which point in operation is the insulation likely to be warmest and most moisture-free: before starting, during running, or right after shutdown? • If you want to detect insulation that is trending worse but still normal, do you want to test when resistance is naturally highest or naturally lowest in normal conditions?

✅ Before You Answer

• Recall that higher temperature generally lowers insulation resistance in electrical windings. • Think about when the machine has been running long enough to reach normal operating temperature, but before it cools and absorbs moisture again. • Verify which option matches a time when the machine is warm, de-energized, and safe to test.

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Question 1 of 205eccefa4bacbc34ba4d4841a

When testing insulation resistance of electric equipment and machinery, ideally when should the insulation resistance be tested for the lowest normal insulation values?

Back

Question 1 of 20

5eccefa4bacbc34ba4d4841a

When testing insulation resistance of electric equipment and machinery, ideally when should the insulation resistance be tested for the lowest normal insulation values?

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

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