In testing a three-phase delta-connected...

Question 1 / 270705eccefa4bacbc34ba4d48538

Question 1 of 270705eccefa4bacbc34ba4d48538

In testing a three-phase delta-connected winding for an open circuit using an ohmmeter, what must be done?

Question 1 of 27070

In testing a three-phase delta-connected winding for an open circuit using an ohmmeter, what must be done?

🔍 Key Concepts

• Delta-connected three-phase windings and how the phases are tied together • How an ohmmeter measures resistance and what happens if a winding is shunted by other paths • Difference between testing a single phase winding versus testing with all connections intact

💭 Think About

• Think about what the ohmmeter is actually measuring when there are multiple parallel paths in a closed delta connection. • Ask yourself: if one phase is open, would the ohmmeter still show a low resistance because current can flow through the other two phases? • Which option best isolates each phase so that a single open in one phase will be detected by the ohmmeter?

✅ Before You Answer

• Verify which choice prevents parallel/shunt paths through the other windings during the test. • Check which method allows you to measure the resistance of only one phase at a time. • Eliminate any option that would keep all three windings permanently interconnected during the resistance test.

Question 1 of 27070

In testing a three-phase delta-connected winding for an open circuit using an ohmmeter, what must be done?

if possible, open the delta-connections to avoid shunting the phase being tested

measure the voltage across the open connections while testing

test the windings as parallel groups to avoid short circuiting

test each phase with all connections intact

Question 1 / 270705eccefa4bacbc34ba4d48538

Question 1 of 270705eccefa4bacbc34ba4d48538

In testing a three-phase delta-connected winding for an open circuit using an ohmmeter, what must be done?

Back

Question 1 of 27070

In testing a three-phase delta-connected winding for an open circuit using an ohmmeter, what must be done?