13. Motor Testing

Question 1

What tests are carried out on a motor.

(When it’s causing a protective device to trip)

Answer 1

• Continuity of windings.
• Insulation resistance between windings.
• Insulation resistance between windings and earthed casing.

Question 2

How do you test the continuity of the windings:

Answer 2

Remove the links, then:

U1 to U2
V1 to V2
W1 to W2

Question 3

How do you carry out Insulation Resistance between the windings:

Answer 3

Remove the links, then:

U to V
U to W
V to W

Question 4

How do you carry out Insulation Resistance between the windings and earthed casing:

Answer 4

U to Earth
V to Earth
W to Earth