Using the temperature correction factor for...

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Question 1 of 2066636eed28f7522a1c51dd4d

Using the temperature correction factor for the winding insulation temperature graph shown in the illustration, what would be the correction factor and the corrected temperature to 40 degrees C for a motor with an insulation resistance of 4 megohms measured at 50 degrees C? Illustration EL-0046

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Question 1 of 20

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🔍 Key Concepts

• Use the graph to find the correction factor K_t at a winding temperature of 50°C. • Apply the relationship shown on the graph: R₄₀ = K_t × R_t, where R_t is the resistance at the measured temperature. • Remember how insulation resistance changes with temperature: it typically decreases as temperature increases.

💭 Think About

• On the horizontal axis, locate 50°C and move vertically to the plotted line. What correction factor K_t does this point correspond to on the vertical axis? • If the motor is hotter than 40°C when you test it, should the corrected resistance at 40°C be higher or lower than the measured resistance? How does that help you choose between multiplying by 2 or by 0.5? • Once you know whether K_t is greater or less than 1 at 50°C, which answer choices can you immediately eliminate?

✅ Before You Answer

• Verify that you are reading 50°C on the x‑axis, not 40°C or another value. • Confirm whether the K_t value from the graph at 50°C is greater than 1 or less than 1 before doing any math. • After applying R₄₀ = K_t × R_t, check that the corrected resistance makes physical sense: a cooler winding (40°C) should have higher insulation resistance than at 50°C.

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