GAPGAPGAPGAPGAPGAPGAPGAP33333333generator assessment processgenerator assessment processgenerator assessment processgenerator assessment process

a solution to life assessment of large generators

omsaiempl@gmail.comanilscoob@gmail.com

GAPGAPGAPGAP1111 GAPGAPGAPGAP2222

GAPGAPGAPGAP****

GAPGAPGAPGAP4444 GAPGAPGAPGAP3333

GAPGAPGAPGAP****

GAPGAPGAPGAP3333 is the inspective approach toGAPGAPGAPGAP is the inspective approach to

assess the residual life of machines

MethodologyMethodologyMethodologyMethodology

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

UnitUnitUnitUnit ConditionConditionConditionCondition

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

InspectionInspectionInspectionInspection &&&& teststeststeststests PerformedPerformedPerformedPerformed

Stator windingStator winding

Electrical tests as done in MAP2

Visual and borescope inspection of statorwinding, stator core laminations andfingerplates (as accessible)

Core tightness test (visual indications oflooseness)

InspectionInspectionInspectionInspection &&&& teststeststeststests PerformedPerformedPerformedPerformed

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

DC step voltage test to determine insulationintegrity

End winding basket frequency checkEnd winding basket frequency check

Rotor winding

Electrical tests as done in MAP2

Visual and borescope inspection of rotorwinding and blocking (as accessible)

Exciter and Accessories

Electrical tests as done in MAP2

BenefitsBenefitsBenefitsBenefits

Reveals pending faults in winding

Reveals deterioration of coil insulation bycorona or end winding vibration

Establish a base line for evaluating futureinspectioninspection

Accurately assess life and future maintenancerequirements

Record of core tightness

Preventive maintenance plan

Schedule for GAP2222, GAP3333 and GAP4444

FinalFinalFinalFinal ReportReportReportReport

Standard format provided electronically

Photographs of critical areas

Location and levels of corona activity

Plots showing frequency distribution ofPlots showing frequency distribution ofend winding basket

Core tightness record

Schedule for MAP4

ExpectedExpectedExpectedExpected DowntimeDowntimeDowntimeDowntime

5-7 days

Condition AssessmentRisk Assessment Approach

Condition AssessmentStator

Operation & Maintenance History

Physical Inspection

Insulation Test

Generator Age

DC Ramped Voltage Test

Partial Discharge Measurement

Dissipation Factor Measurement

Ozone Monitoring

Black Out TestBlack 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 MeasurementCapacitance Measurement

Core Bolt Insulation Resistance

Winding Conductor Resistance Measurement

Impedance Measurement

Winding Dissection

10987654321

Stator Condition Index

10987654321

10740

Stator Data Quality Index

10740

Condition AssessmentRotor

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

10987654321

Rotor Condition Index

10987654321

10740

Rotor Data Quality Index

10740

Condition AssessmentGenerators

10987654321

Generator Condition Index

10987654321

10740

Generator Data Quality Index

10740

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