Our extensive library of on-line EMI analyses have identified the following documented conditions:

1. Stator slot discharges due to coating deterioration.
2. Partial discharges between phase groups in endwindings.
3. Contamination of motor and generator endwindings.
4. Wet generator stator bar endwinding insulation.
5. Broken/shorted stator subconductors.
6. Loose stator wedging.
7. Loose endwinding supports and ties.
8. Loose generator phase ring ties.
9. Stator coil side packing erosion.
10. Commutator/brush box rub.
11. Arcing shaft grounding brush.
12. Arcing slip ring brushes.
13. Mis-adjusted dc exciter brushes.
14. Shaft oil seal rub.
15. Fan blade corona.
16. Synchronous motor field ground.
17. Inadequate 13 kV motor lead insulation.
18. Loose 4 kV motor phase lead crimp connections.
19. Loose 4 kV motor neutral connection.
20. Loose Iso-bus conductor support insulators.
21. Loose Iso-bus conductor bolts.
22. Broken Iso-bus conductor support insulator.
23. Contaminated Iso-bus conductor support insulators.
24. Foreign metal objects within Iso-bus.
25. Broken auxiliary 4 kV cable shield ground.
26. Defective voltage regulator damping circuit.
27. Defective exciter SCR firing circuit adjustment
28. Defective ground on unused 230 kV transmission line.
29. Foreign object in generator rectifier cubicle.
30. Loose internal generator breaker parts.
31. Foreign object on hydrogenerator rotor.
32. Foreign object on generator stator windings.
33. Loose emergency generator grounding resistor connection.
34. Circulating current in speed increaser gear box.
35. Defective auxiliary transformer connections.
36. Loose connection to bus potential transformer.
37. Loose connection to a surge protection capacitor.
38. Loose generator flux shield grounding connection.
39. Verify stator maintenance was successful.
40. Determine that incorrect stator maintenance was performed