A digital multimeter is set up as shown in...

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Question 1 of 205eccefa4bacbc34ba4d4813b

A digital multimeter is set up as shown in the illustration to evaluate the single-circuit stator windings of a squirrel cage induction three-phase motor. The following readings are taken: From T1 to T2 reads 0.8 ohms. From T2 to T3 reads 0.8 ohms. From T3 to T1 as shown reads 1.6 ohms. What condition is indicated? See illustration EL-0220.

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🔍 Key Concepts

• Delta-connected three-phase stator: how each terminal pair (T1–T2, T2–T3, T3–T1) normally measures the resistance of just one phase winding. • Effect of an open phase winding: how the current (or ohmmeter test current) will travel through the remaining healthy windings when one side is open. • Comparing resistance values: what it means when one reading is exactly twice the value of the other two.

💭 Think About

• On a healthy delta-connected stator, what would you expect the resistance between each pair of terminals (T1–T2, T2–T3, T3–T1) to look like? Equal, different, or some pairs in series? • If one phase between two terminals is open, how can the meter still show a finite resistance between those same two terminals? Through what alternate path could the current flow? • What does it tell you physically if one measured resistance is the sum of the other two? Which winding must be interrupted for that to happen?

✅ Before You Answer

• Verify which winding is directly between T1 and T2, T2 and T3, and T3 and T1 in the delta diagram. • Confirm that 1.6 Ω is equal to 0.8 Ω + 0.8 Ω, and think about whether the meter must be reading through two good windings in series. • Before choosing, match each option’s description (damaged/undamaged phases) with the pattern: two equal low resistances and one resistance exactly double.

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