This fault shows zero volts due to no coupling action and is associated with which transformer coil?

This fault shows zero volts due to no coupling action and is associated with which transformer coil?

• A. Resistance Testing
• B. Open or Shorted Primary Coil
• C. Insulation Testing
• D. Open or Shorted Secondary Coil

Answer: (D)

When the primary is energized, the secondary should show voltage because the windings are magnetically coupled. If you observe zero volts on the secondary due to no coupling action, the problem lies in the secondary winding itself. The most likely fault is that the secondary coil is open or has shorted turns, which prevents the secondary from presenting the normal induced voltage. Insulation and resistance checks can help confirm a winding fault, but zero secondary voltage under test specifically points to issues in the secondary winding.

When the primary is energized, the secondary should show voltage because the windings are magnetically coupled. If you observe zero volts on the secondary due to no coupling action, the problem lies in the secondary winding itself. The most likely fault is that the secondary coil is open or has shorted turns, which prevents the secondary from presenting the normal induced voltage. Insulation and resistance checks can help confirm a winding fault, but zero secondary voltage under test specifically points to issues in the secondary winding.