English to Finnish Tech/Engineering Mechanics / Mech Engineering manual

The installation of the Endwinding Vibration Accelerometer Kit must be performed by a skilled person trained in the installation procedure to ensure that the integrity of the system is not impaired.


Motor and generator stator endwindings, the portion of the coils outside of the stator core, can vibrate during operation.
This vibration can abrade the high voltage insulation on the coils, can lead to cracking of the coil insulation just outside of the stator slot and, in severe cases, may cause the copper conductors to fatigue crack leading to high arcing currents.
Any of these issues can lead to stator winding ground faults.

The vibration can occur due to twice AC frequency magnetic forces in the endwinding (100/120Hz) and due to the rotational frequency vibration transmitted to the endwinding (50/60Hz for 2-pole machines, 25/30Hz for 4-pole machines, etc.).