CONTENTS
Paragraph Page
1. Types of insulation used on rotating machines, their insulation life,
and deterioration causes ....................................... .....................................................1
1.1 Thermoplastic (asphalt-mica) ........................................................................1
1.2 Thermosetting (polyester-mica or epoxy-mica) ..................................................1
2. Mechanical limitations ................................................................................................1
3. Damage caused by expansion of copper ............................................................2
4. Limiting temperatures for insulation ...................................................................2
5. Hottest spot allowance ....................................................................................3
6. Limiting temperature rise ................................................................................3
7. Operation of machines under warranty ..............................................................3
8. Operation up to rated capacity .........................................................................3
9. Short-time and emergency overloads.................................................................7
10. Load limitations of associated equipment ...........................................................8
11. Cooling water ...........................................................................................................8
12. Cooling water regulation..................................................................................8
13. Supplemental cooling ......................................................................................9
14. Keeping machines clean .................................................................................9
15. Temperature of old machines ...........................................................................9
16. Changing voltage to reduce temperature............................................................10
17. Load temperature tests ..................................................................................10
18. Measuring stator temperature .........................................................................10
19. Measuring field temperature ...........................................................................10
20. Computing stator winding temperature rise ........................................................11
21. Generator capability curves ............................................................................11
21.1 0verexcited (boosting voltage) ................................................................13
21.2 Underexcited (bucking voltage) ..............................................................13
22. References ...............................................................................................................16
CMMS Fleet Maintenance Software for Fleet, Vehicle, & Equipment Maintenance
This Information is Reprinted From UNITED STATES DEPARTMENT OF THE INTERIOR BUREAU OF RECLAMATION
