Earth Fault

What does 3 mean?

The current measurement system has detected that the sum of the motor phase currents is not zero, indicating a leakage current to ground. This fault is most commonly caused by insulation failure in the motor cables or within the motor windings themselves.

• Insulation failure in motor windings or power cables.
• Ground fault in the connected equipment.
• Moisture or contamination ingress into electrical components.
• Faulty grounding connection.

Click steps to track your progress.

1. 1

   Measure the insulation resistance between each motor phase cable (U, V, W) and ground (PE) using a megger.

2. 2

   Measure the insulation resistance between each motor winding (U, V, W) and the motor frame (PE) with a megger.