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GAP 3
             generator assessment process
       a solution to life assessment of large generators




anilscoob@gmail.com                          omsaiempl@gmail.com
1   GAP 2
GAP

    GAP*


GAP 4   GAP 3
GAP3 is the inspective approach to
assess the residual life of machines
Methodology
The      methodology      employed     is
conducting      standard   and    special
electrical tests and inspection on stator
and rotor windings and accessories
Unit Condition
The machine is in assembled condition with
access covers and top half of end brackets
removed
Inspection & tests Performed
Stator winding
Electrical tests as done in MAP2
Visual and borescope inspection of stator
winding,    stator   core    laminations and
fingerplates (as accessible)
Core tightness test    (visual     indications of
looseness)
Inspection & tests Performed
Corona tests, as accessible, to determine
areas and severity of any corona activity
DC step voltage test to determine insulation
integrity
End winding basket frequency check
Rotor winding
Electrical tests as done in MAP2
Visual and borescope inspection of     rotor
winding and blocking (as accessible)
Exciter and Accessories
Electrical tests as done in MAP2
Benefits
Reveals pending faults in winding
Reveals deterioration of coil insulation by
corona or end winding vibration
Establish a base line for evaluating future
inspection
Accurately assess life and future maintenance
requirements
Record of core tightness
Preventive maintenance plan
Schedule for GAP2, GAP3 and GAP4
Final Report
Standard format provided electronically
Photographs of critical areas
Location and levels of corona activity
Plots showing frequency distribution of
end winding basket
Core tightness record
Schedule for MAP4
Expected Downtime
5-7 days
Condition Assessment
                 Risk Assessment Approach
Condition Assessment
                       Stator
Operation & Maintenance History


Physical Inspection


Insulation Test


Generator Age
DC Ramped Voltage Test


Partial Discharge Measurement


Dissipation Factor Measurement


Ozone Monitoring


Black Out Test


High Potential Withstand Test


Stator Core Inspection


Wedge Tightness Evaluation


Core Loop Test
ELCID Test


Corona Probe Test


Coupling Resistance Test


Bump test


Capacitance Measurement


Core Bolt Insulation Resistance


Winding Conductor Resistance Measurement


Impedance Measurement


Winding Dissection
Stator Condition Index




  1   2 3 4 5 6 7 8 9 10
Stator Data Quality Index




    0      4      7     10
Condition Assessment
                       Rotor
Operation & Maintenance History


Physical Inspection


Insulation Test


Generator Age
High Potential Withstand Test


Rotor Core Inspection


AC Pole Drop Test


AC Impedance Test


Winding Resistance Measurement


RSO Test
Rotor Condition Index




  1   2 3 4 5 6 7 8 9 10
Rotor Data Quality Index




    0      4      7        10
Condition Assessment
                       Generators
Generator Condition Index




  1   2 3 4 5 6 7 8 9 10
Generator Data Quality Index




   0       4      7     10
THANK YOU



ध यवाद




               ‫ا‬
‫ﮨﮯ‬    ‫ﯾہ ادا‬



ந    றி

ಧನ ಾದಗಳ

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Generator Assessment Process - Level 3

  • 1. GAP 3 generator assessment process a solution to life assessment of large generators anilscoob@gmail.com omsaiempl@gmail.com
  • 2. 1 GAP 2 GAP GAP* GAP 4 GAP 3
  • 3. GAP3 is the inspective approach to assess the residual life of machines
  • 4. Methodology The methodology employed is conducting standard and special electrical tests and inspection on stator and rotor windings and accessories
  • 5. Unit Condition The machine is in assembled condition with access covers and top half of end brackets removed Inspection & tests Performed Stator winding Electrical tests as done in MAP2 Visual and borescope inspection of stator winding, stator core laminations and fingerplates (as accessible) Core tightness test (visual indications of looseness)
  • 6. Inspection & tests Performed Corona tests, as accessible, to determine areas and severity of any corona activity DC step voltage test to determine insulation integrity End winding basket frequency check Rotor winding Electrical tests as done in MAP2 Visual and borescope inspection of rotor winding and blocking (as accessible) Exciter and Accessories Electrical tests as done in MAP2
  • 7. Benefits Reveals pending faults in winding Reveals deterioration of coil insulation by corona or end winding vibration Establish a base line for evaluating future inspection Accurately assess life and future maintenance requirements Record of core tightness Preventive maintenance plan Schedule for GAP2, GAP3 and GAP4
  • 8. Final Report Standard format provided electronically Photographs of critical areas Location and levels of corona activity Plots showing frequency distribution of end winding basket Core tightness record Schedule for MAP4
  • 10. Condition Assessment Risk Assessment Approach
  • 12. Operation & Maintenance History Physical Inspection Insulation Test Generator Age
  • 13. DC Ramped Voltage Test Partial Discharge Measurement Dissipation Factor Measurement Ozone Monitoring Black Out Test High Potential Withstand Test Stator Core Inspection Wedge Tightness Evaluation Core Loop Test
  • 14. ELCID Test Corona Probe Test Coupling Resistance Test Bump test Capacitance Measurement Core Bolt Insulation Resistance Winding Conductor Resistance Measurement Impedance Measurement Winding Dissection
  • 15. Stator Condition Index 1 2 3 4 5 6 7 8 9 10
  • 16. Stator Data Quality Index 0 4 7 10
  • 18. Operation & Maintenance History Physical Inspection Insulation Test Generator Age
  • 19. High Potential Withstand Test Rotor Core Inspection AC Pole Drop Test AC Impedance Test Winding Resistance Measurement RSO Test
  • 20. Rotor Condition Index 1 2 3 4 5 6 7 8 9 10
  • 21. Rotor Data Quality Index 0 4 7 10
  • 22. Condition Assessment Generators
  • 23. Generator Condition Index 1 2 3 4 5 6 7 8 9 10
  • 24. Generator Data Quality Index 0 4 7 10
  • 25.
  • 26. THANK YOU ध यवाद ‫ا‬ ‫ﮨﮯ‬ ‫ﯾہ ادا‬ ந றி ಧನ ಾದಗಳ