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GAPGAPGAPGAPGAPGAPGAPGAP33333333

 a solution to life assessment of large generators

omsaiempl@gmail.comanilscoob@gmail.com

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GAPGAPGAPGAP

1111

GAPGAPGAPGAP

2222

****

GAPGAPGAPGAP4444

GAPGAPGAPGAP3333

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GAPGAPGAPGAP3333 is the inspective approach to

assess the residual life of machines

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MethodologyMethodologyMethodologyMethodology

The methodology employed isconducting standard and specialelectrical tests and inspection on statorand rotor windings and accessories

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UnitUnitUnitUnit ConditionConditionConditionCondition

The machine is in assembled condition withaccess covers and top half of end bracketsremoved

InspectionInspectionInspectionInspection &&&& teststeststeststests PerformedPerformedPerformedPerformed

Electrical tests as done in MAP2

Visual and borescope inspection of statorwinding, stator core laminations and

fingerplates (as accessible)Core tightness test (visual indications of looseness)

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InspectionInspectionInspectionInspection &&&& teststeststeststests PerformedPerformedPerformedPerformed

Corona tests, as accessible, to determineareas and severity of any corona activity

DC step voltage test to determine insulationintegrity

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

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BenefitsBenefitsBenefitsBenefits

Reveals pending faults in winding

Reveals deterioration of coil insulation bycorona or end winding vibration

Establish a base line for evaluating future

Accurately assess life and future maintenancerequirements

Record of core tightness

Preventive maintenance plan

Schedule for GAP2222, GAP

3333 and GAP4444

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FinalFinalFinalFinal ReportReportReportReport

Standard format provided electronically

Photographs of critical areas

Location and levels of corona activity

end winding basket

Core tightness record

Schedule for MAP4

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ExpectedExpectedExpectedExpected DowntimeDowntimeDowntimeDowntime

5-7 days

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Condition AssessmentRisk Assessment Approach

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Condition AssessmentStator

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Operation & Maintenance History

Physical Inspection

Insulation Test

Generator Age

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DC Ramped Voltage Test

Partial Discharge Measurement

Dissipation Factor Measurement

Ozone Monitoring

 

High Potential Withstand Test

Stator Core Inspection

Wedge Tightness Evaluation

Core Loop Test

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ELCID Test

Corona Probe Test

Coupling Resistance Test

Bump test

Ca acitance Measurement

Core Bolt Insulation Resistance

Winding Conductor Resistance Measurement

Impedance Measurement

Winding Dissection

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Stator Condition Index

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Stator Data Quality Index

10740

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Condition AssessmentRotor

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Operation & Maintenance History

Physical Inspection

Insulation Test

Generator Age

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High Potential Withstand Test

Rotor Core Inspection

AC Pole Drop Test

AC Impedance Test

Winding Resistance Measurement

RSO Test

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Rotor Condition Index

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Rotor Data Quality Index

10740

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Condition AssessmentGenerators

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Generator Condition Index

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Generator Data Quality Index

10740

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THANK YOU

  

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