pre-commissioning check list of generator

PRE –COMMISSIONING CHECK LIST OF GENERATOR

1. TECHNICAL SPECIFICATION MANUFACTURER SL NO.TYPERATED OUTPUTMAXIMUM CONTINUOUS OUTPUTRATED VOLTAGERATED CURRENTRATED POWER FACTORRATED FREQUENCYRATED SPEEDNO OF PHASESSTATOR WINDING CONNECTIONNO OF TERMINALINSULATION CLASSCOOILNG MODERATED H2 PRESSUREEXCITATION TYPESHORT CIRCUIT RATIOEFFICIENCYRATED FIELD VOLTAGERATED FIELD CURRENTREACTANCE DATA SATURATION UNSATURATIONDIRECT AIXS Synchronous(Xd)QUADRATURE AIXS Synchronous(Xq)DIRECT AXIS TRANSIENT(Xd’)QUADRATURE AXIS TRANSIENT(Xq’)DIRECT AXIS SUB-TRANSIENT(Xd”)QUADRATURE AXIS SUB-TRANSIENT(Xq”)NAGATIVE PHASE SEQUENCE(X2)ZERO SEQUENCE(X0)CAPACITANCE OF STATOR WINDING(PER PHASE)INDUCTANCE OF ROTOR WINDINGFIELD WINDING TIME CONSTANT(OPEN CIRCUIT)TRANSIENT TIME CONSTANT(3-PHASE SHORT CIRCUIT)TRANSIENT TIME CONSTANT(LINE-LINE SHORT CIRCUIT)TRANSIENT TIME CONSTANT(LINE-NEUTRAL)SUB-TRANSIENT TIME CONSTANT(3 PHASE,LINE-LINE,LINE- NEUTRAL)ARMATURE TIME CONSTANT(Aperiodic componet,3 phase,line-line)ARMATURE TIME CONSTANT(Aperiodic time constant,line-neutral)


MECHANICAL INERTIA TIME CONSTANT OF ROTORCRITICAL SPEED OF ROTORVIBRATION(BEARING PEDESTAL,SHAFT) at 3000 rpmLIMITATION OF TEMPERATURESTATOR WINDING OUTLET WATERSTATOR WINDINGSTATOR WINDING TEMP DIFFERENCE( MAX-AV)FIELD WINDINGSTATOR CORESTRUCTURE PART OF STATOR ENDCOLLECTOR RINGBEARINGBEARING OUTLET/SEAL OUTLET OIL


ITEM CHECK LIST

GENERATOR COIL PRESSURE TESTS NO ACTIVITY/CHECK STATUS1. Erection work is completed and clearance taken from

project (Civil, Elect, Mech.)2. Ensure the Availability of Nitrogen cylinder of

required Pressure and purity3. Ensure the sealing of the generator windings cooling

water out let header. 4. Ensure the cooling water Inlet and outlet header

drain valve closed5. Check the cleanliness of external pipes from inside6. Availability of instrument to measure ambient

temperature7 Pressure gauge and temperature gauge is calibrated

REMARKS:Stator Winding IR and PI Test

S NO ACTIVITY/CHECK STATUS1.

Generator Flexible links to be Opened 2. Other circuits not under test to be kept disconnected

and keep enough clearance3.

Insulation tester connections to be done correctly4. RTDs and Hydrogen tank to be guarded to Megger and

CTs’ secondary to be shorted5. Test device terminal lead, and the connection point with

windings are clean.

6 LAPT Panel to be in rack out condition7. Winding surface, core, and bushings should be free

from dust, moisture etc and clean.8 Ensure that NGT Knife gate to be opened

REMARKS:

Stator Winding DC Resistance MeasurementS NO ACTIVITY/CHECK STATUS


1. All the test devices connection should be correct.

2.Lead terminals of test kit and winding should be clean

3. Rotor shaft is connected through brush to earth properly.

4 Availability of instrument to measure ambient temperature

REMARKS:

DC/AC High Voltage TestS NO ACTIVITY/CHECK STATUS1 IR testing of winding completed and values are

acceptable2.

Test lead not to touch ground surface.3. Rotor winding, Test kit earth point and all other portion

which are not under test to be properly earthed.4. Test transformer and all other connections to be done

correctly5. RTDs to be grounded and CTs’ secondary to be shorted

6. Availability of instrument to measure ambient temperature

REMARKS:


ROTOR AIR TIGHTNESS TESTS NO ACTIVITY/CHECK STATUS1.

Rotor is on proper support2.

External pipes to be used are clean from inside3. Flange joint between nitrogen pipe and rotor shaft is

properly tight.4. Nitrogen cylinder should be of moisture free and

proper purity.5 Pressure gauge and temperature gauges are

calibrated

REMARK

ROTOR AIR FLOW TESTS NO ACTIVITY/CHECK STATUS1. There must not be any leak point in the bellow from

test kit to rotor.2.

All ventilation holes of rotor are approachable 3. Compressed air should be of adequate pressure and

moisture free4

Flow measurement instrument is calibrated

REMARKS:

Rotor IR TestS NO ACTIVITY/CHECK STATUS1.

All the test devices connection should be correct


2. Connection point of test lead and slip ring should be clean

3.Rotor surface should be free from dust, moisture.

4.Test lead not to touch ground surface

5. Rotor shaft should be properly earthed6 Temp gauge is available to measure ambient

temperature

REMARKS:

AC HIGH VOLTAGE TEST OF ROTORS NO ACTIVITY/CHECK STATUS1 IR test completed and values are acceptable.2. All the test devices connection should be correct.

3.Rotor shaft to be connected to earth.

4.Test lead should not touch ground

REMARKS:

ROTOR WINDING DC/AC RESISTANCE MEASUREMENT AND RSO TEST

S NO ACTIVITY/CHECK STATUS1. All the test devices connection should be correct.

2. Connection point of test lead and slip ring should be free from dust

3.Test leads should not touch ground surface


4. Rotor surface should be free from dust, moisture etc

REMARKS:

HIGH VOLTAGE TEST OF BUSHINGS NO ACTIVITY/CHECK1 IR test is completed and values are acceptable STATUS2. All the test devices connection should be correct.

3. Connection point of test lead and bushing internal conductor should be free from dust

4.Test leads should not touch ground surface

5.bushing surface should be free from dust, moisture etc

6.Bushing insulation to be earthed properly.

REMARKS:


BRUSH EXCITATION SYSTEMS NO ACTIVITY/CHECK STATUS1 Visual checking of carbon brushes 2. Proper tightness of Brush terminals

3.Ensure the Cooling system is healthy

4.Ensure proper tightness of the Input DC Cable/Bus

TERMINAL CT OF GENERATORS NO ACTIVITY/CHECK STATUS1 Ensure the tightness of Secondary of the CT2. CT Marshaling Box Wiring to be done according to the

Scheme.

3.Spare cores of the CT to be Shorted

4.Visual checking of any abnormality

Remarks:

12.0 DATA SHEET

12.1 GENERATOR COIL PRESSURE TEST

DATE:

TIME Pressure(KSC) Ambient Temp(degC) Pressure Drop


REMARKS:


12. 2 IR TEST OF STATOR WINDING

TESTING EQUIPMENT USED:DATE:

Equipment Name: MAKE : Sl.no : Model No:Voltage Rating: Due Date for Calibration:

AMBIENT TEMP: HUMIDITY:

S.NO REFERENCE R15 R60 R600 PI = R600 /R601. R-(Y+B+E)2. Y-(R+B+E)3. B-(R+Y+E)4. R-Y (B+E)5. Y-B (R+E)6 R-B (Y+E)

CRITERIA: PI should be more than 1.5

REMARKS:


12.3: DC RESISTANCE OF WINDING

TESTING EQUIPMENT USED:DATE:

Equipment Name: MAKE : Sl.no : Model No:Current Rating:- Due date for calibration:

APPLIED CURRENT: AMBIENT TEMP: HUMIDITY:

PHASE RESISTANCE(OHM)

RESISTANCE AT BASE VALUE TEMP

% DEVIATION FROM BASE VALUE

R1 – R2Y1-Y2B1-B2

CRITERIA: Deviation shouldn’t be more than 2%.

REMARKS:


12.4: DC HIGH VOLTAGE TEST TESTING EQUIPMENT USED:Equipment Name : Make : Model No. : Sl. No. : Due date for Calibration:

Humidity: Ambient Temp: Date:

Rated Voltage Un=

PHASE 1Un 1.5Un 2 Un 2.5Un 3Un15sec

60sec

15sec

60sec

15sec

60sec

15sec

60sec

15sec

60sec

R-(Y+B+E)Y-(R+B+E)B-(R+Y+E)

REMARKS:


12.5: AC HIGH VOLTAGE TEST

TESTING EQUIPMENT USED:Equipment Name : Make : Model No. : Sl. No. :Due date for calibration: DATE:

Humidity: Ambient Temp:

ReferenceMeasured Values

Applied Volt(KV) Duration(mins) Leakage current(A)

R - Phase Y- Phase B - Phase

REMARKS:


12.6 ROTOR AIR TIGHTNESS TEST

DATE:

TIME PRESSURE(ksc) TEMPERATURE(degC)

REMARKS:


12.7 ROTOR AIRFLOW TEST

DATE:

PATH NO FLOW VELOCITY(m/s)

CRITERIA: Flow should be uniform and through in all paths.

REMARKS:


12.8: IR TEST OF ROTOR WINDING

TESTING EQUIPMENT USED:Equipment Name : Make : Model No. : Sl. No. : Due date for Calibration:

AMBIENT TEMP: HUMIDITY: Date:

Applied Volatage(slip ring- Core) IR for 1 min

REMARKS:


12.9 AC HIGH VOLTAGE TEST OF ROTOR WINDING

TESTING EQUIPMENT USED:Equipment Name : Make : Model No. : Sl. No. : Due Date for Calibration:



KV Mins Leakage current(A)

SLIP RING- EARTH

REMARKS:


12.10 DC Resistance of Rotor winding

TESTING EQUIPMENT USED: Date:Equipment Name : Make : Model No. : Sl. No. : Current Rating :Due Date for Calibration:

CURRENT APPLIED: TEMP: HUMIDITY:

PHASE Winding Resistance 1st attempt

Winding Resistance 2st attempt

ACROSS SLIP RING

CRITERIA: Deviation from base value should not be more than 2%.

REMARKS:

12.11 AC Resistance of Rotor winding

TESTING EQUIPMENT USED:

Equipment Name : Make :


Model No. : Sl. No. :Due date for Calibration:

Humidity: Ambient Temp: Date

VOLTAGE APPLIED(V)

CURRENT MEASURED(A) IMPEDANCE

CRITERIA:

REMARKS


12.12 HIGH VOLTAGE TEST OF BUSHING

TESTING EQUIPMENT USED:

Equipment Name : Make : Model No. : Sl. No. : Due date for calibration:


BUSHING Sl No:


KV Mins Leakage current(A)

Phase- Earth

REMARKS:


12.13 CT NAMEPLATE DETAIL:

CT Manufacturer: Date:

CT Serial No Ratio VA Class Knee Point

Remarks:


12.13.1 CT POLARITY CHECKS:

Date:

CT Serial No POLARITY

Remarks:


12.13.2 INSULATION RESISTANCE TEST:

TESTING EQUIPMENT USED:Equipment Name : Make : Model No. : Sl. No. : Due date for Calibration:


CT Serial No Voltage Applied Duration IR Value

Remarks:


12.13.3 WINDING RESISTANCE TEST:

TESTING EQUIPMENT USED:Equipment Name : Make : Model No. : Sl. No. : Due date for Calibration:Current Rating :


CT Serial No Winding Resistance

Corrected base value

Factory value

CRITERIA: Deviation of base value from factory value should not be more than 2%.Remarks:


12.13.4 PRIMARY INJECTION TEST

TESTING EQUIPMENT USED:Equipment Name : Make : Model No. : Sl. No. : Due date for Calibration:Current Rating :

AMBIENT TEMP: HUMIDITY: Date

CT Serial No Primary Current Applied

Measured Secondary Current

Ratio

CRITERIA: Ratio should match with the name plate data

Remarks:


12.13.5 CT Knee Point Test:

TESTING EQUIPMENT USED:Equipment Name : Make : Model No. : Sl. No. : Due date for Calibration: DATE:

CT Serial No Applied Voltage Measured Current

CRITERIA: Knee point should match with the name plate data.

REMARKS:

pre-commissioning check list of generator

Documents

touch ground surface

armature time constant

transient time constant

test devices connection

dust test leads

5un 15se 60se

slip ring

time pressure