What defects of Rolling Mill Motor can be found by insulation resistance test?

1. Aging of winding insulation: The reduction of insulation resistance value may indicate that the insulation material of the winding has aged due to long-term use, heat, moisture and other factors, and the insulation performance has decreased.
2. Winding dampness: If the motor has been in a humid environment for a long time or has been flooded, the insulation resistance value will be significantly reduced, indicating that the winding is damp.
3. Insulation damage: For example, scratches, wear, cracks and other conditions on the insulation layer of the winding will cause abnormal insulation resistance.
4. Winding short circuit: When a short circuit occurs between some windings, the insulation resistance value will be significantly reduced.
5. Poor insulation at the terminal: If there is a problem with the insulation at the connection between the terminal and the winding, it can also be reflected by the insulation resistance test.
6. Insulation damage caused by foreign matter intrusion: Foreign matter such as dust and metal debris enters the motor and damages the insulation, which will be reflected in the insulation resistance test.