DETAILED REPORT ON OVERHAULING OF 30 MW GTG · PDF fileDETAILED REPORT ON OVERHAULING OF 30 MW GTG # 5 AT RELIANCE INDUSTRIES LTD., HAZIRA ... 4. Resistance of Stator, Rotor,

DETAILED REPORT ON OVERHAULING OF 30 MW GTG # 5 AT

RELIANCE INDUSTRIES LTD., HAZIRA Work Order Ref : Duration : 08.02.2008 to22.02.2008 Customer Coordinators : R. K. Bansal & Makarand Phadnis Site Engineer : Julius Tuscano Analysis by : Aditya Korde

Diagnostic Technologies India Pvt. Ltd.

1

TABLE OF CONTENTS

Page No.

Generator details 2

Executive summary 3

Visual inspection & corrective actions 4

Mechanical measurements 6 ♦ Mechanical clearances ♦ Air-gaps ♦ Interferences & dimensions ♦ Swing run-out ♦ Coupling bolt elongation ♦ Alignment

Electrical measurements 12 ♦ Insulation Resistance, Polarization Index & Dielectric Discharge ♦ Winding Circuit Analysis ♦ Step Voltage Test ♦ Digital Surge Comparison Test (Rotor & Stator) ♦ Diode Health Check ♦ Tan Delta & Capacitance Analysis ♦ Flux Loop Test ♦ ELCID Test ♦ Partial Discharge Analysis

On-line tests 31 ♦ Electrical Signature Analysis ♦ Vibration Analysis ♦ Acoustic Emission Analysis


2

GENERATOR DETAILS

Make : BHEL

KW : 30000

RPM : 3000

Power Factor : 0.80

Hertz : 50

KVA : 37500

Phase : 3

Stator Volts : 11000

Connection : Y

Stator Amps : 1968

Coolant : Air

Rotor Volts : 61

Rotor Amps : 221

Insulation Class : B

Type : TARI 800-26P

Specification : IS5422

Sr. No. : 1336

Division : Hyderabad

Year : 1996

BRUSHLESS EXCITER DETAILS

Type : ELR/44/22-30/6-3

Sr. No. : 10490

Insulation Class : B

KW : 136

Amps : 681

RPM : 3000

Excitation : 638 Watt

Volts : 51

Amps : 13


3

EXECUTIVE SUMMARY

Overall, the generator seems to be in healthy condition with no significant faults detected. Insulation resistance, polarization index, dielectric discharge ratio, step voltage test, surge test, circuit analysis, tan delta & capacitance analysis, rotor surge comparison test, ELCID and electrical signature analysis did not detect any defects. The PD levels on the generator are higher than on other identical generators at Hazira complex, indicating early insulation degradation. We recommended installing capacitive couplers on the generator so that PD can be monitored on-line in the future. The exciter bearing was found to have excessive clearances & was replaced. The new bearing’s condition is not very good (as revealed by vibration & acoustic emission analyses) & we recommend that original bearings be procured from the manufacturer for the future. For Diagnostic Technologies India Pvt. Ltd.

Aditya Korde Executive Director


4

GENERATOR VISUAL INSPECTION & CORRECTIVE ACTIONS

• Generator Stator: The bellow between inner end shields (EE) and exciter passage was found to be

in good condition. The same bellow was installed during assembly.

Oil deposition with carbon dust was observed on the stator overhang portion and core portion. This was thoroughly cleaned by spraying with solvents.

Stator overhang supports’ tightness was checked and found to be intact.

The stator overhang jumper support bolts were found intact.

Stator core bolts’ locking was checked and found to be intact.

Stator winding lacing was checked and found in good condition.

Stator core ventilating ducts were checked. No blockage was found in the holes.

Stator slot wedge mapping was done on all 54 slots. The readings were found

within the limits. The mapping chart is enclosed.

• Generator Rotor: Rotor was visually checked for any hotspot or flash over. Nothing was found.

Rotor wedges’ tightness was checked. No looseness was found.

The wedge locking grub screws’ tightness was checked. No looseness was

found.

Rotor cooling ducts were checked.

The retaining rings’ locking system was found to be intact.

Both sides’ shaft journals were found in good condition.

• Generator Exciter/PMG Stator: Stator wedges’ tightness was checked. No looseness was found.

Stator locking/pole locking tightness was checked and found to be intact.


5

• Generator Exciter/PMG Rotor:

Rotating diode fuses’ tightness & locking were checked. No looseness was found.

Rotor journal was checked with Ultrasonic & DP. No crack or deformities were

observed.

Exciter bearing clearance was high. New bearing was installed during assembly.


6

MECHANICAL MEASUREMENTS

(ALL READINGS IN MM) 1. Clearances of generator end shields before dismantling:

Turbine End Exciter End 0.65 0.80 0.50 0.40 0.45 0.50

0.25 0.25

2. Clearances of generator end shields after assembly: Turbine End Exciter End 0.30 0.50 0.25 0.28 0.50 0.50

0.15 0.10

3. Fan blades clearances of generator w.r.t. end shields (exciter side): BEFORE: AFTER:

4. Fan blades clearances of generator w.r.t. end shields (turbine side): BEFORE: AFTER:


7

5. Diode cover clearances of generator w.r.t. gen-exciter coupling: BEFORE: AFTER:

6. Air gap between exciter stator & rotor:

4.60 4.65 4.40 4.55

4.40 4.65

7. Air gap between PMG stator and rotor: BEFORE: AFTER:

8. Clearances of generator exciter end bearing oil deflector w.r.t. shaft:

Front side Back side

0.20 0.15 0.15 0.10 0.10 0.10 0.02 0.04

9. Clearances of generator turbine end bearing oil deflector w.r.t. shaft: Front side Back side

0.25 0.25 0.25 0.20 0.22 0.18 0.10 0.05


8

10. Side clearance of generator T/E bottom bearing:

0.37 RS 0.33

0.35 LS 0.35

11. Side clearance of generator E/E bottom bearing:

0.37 RS 0.33

0.35 LS 0.35

12. Generator T/E bearing clearance by lead wire: 0.33 mm 13. Generator E/E bearing clearance by lead wire: 0.34 mm

14. Exciter bearing clearance by lead wire: 0.26 mm

15. Generator T/E bearing interference : 0.02 mm 16. Generator E/E bearing interference : 0.03 mm

17. Exciter bearing interference: 0.02 mm

18. Insulation resistance of generator E/E bearing: 41.8 MΩ (500 V)


9

19. Generator alignment with load gear:

Axial reading taken by slip gauge:

Position Top Right Bottom Left 0° 7.42 7.38 7.37 7.38

90° 7.38 7.38 7.37 7.38 180° 7.39 7.37 7.37 7.38 270° 7.40 7.37 7.38 7.39 Total 29.59 29.51 29.49 29.53

Average 7.397 7.375 7.372 7.382

Radial Axial 0.00 0.00 -0.02(L) -0.03(R) (L) -0.02 - 0.01(R) -0.05 -0.02

20. Generator coupling bolt elongation after assembly:

Bolt no. Before Tightening

After Tightening Elongation

1 235.00 235.14 0.14

2 235.00 235.13 0.13

3 234.90 235.04 0.14

4 235.20 235.36 0.16

5 235.00 235.17 0.17

6 235.20 235.37 0.17

7 234.95 235.12 0.17

8 235.30 235.46 0.16

9 235.80 235.96 0.16

10 235.16 235.30 0.14

11 234.90 235.31 0.14

12 235.60 235.22 0.15


10

21. Stator Slot Wedge Mapping Chart:

Total no. of wedges: 540 Total no. of slots: 54 Wedge nos. 1 & 10 indicate end wedges

Wedge nos. 1 2 3 4 5 6 7 8 9 10 Slot nos.

1 0.43 0.72 2 0.37 0.35 3 0.29 0.44 4 0.52 0.70 5 0.40 0.40 6 0.46 0.65 7 0.44 0.69 8 0.25 0.56 9 .0.19 0.45 10 0.64 0.44 11 0.38 0.35 12 0.40 0.62 13 0.29 0.80 14 0.19 0.50 15 0.55 0.50 16 0.16 0.36 17 0.37 0.37 18 0.10 0.50 19 0.64 0.71 20 0.60 0.60 21 0.24 0.57 22 0.20 0.58 23 0.59 0.41 24 0.58 0.35 25 0.33 0.58 26 0.38 0.60 27 0.57 0.40 28 0.38 0.80 29 0.20 0.33 30 0.53 0.48 31 0.44 0.37 32 0.55 0.19 33 0.29 0.62 34 0.46 0.45 35 0.33 0.21 36 0.50 0.41 37 0.70 0.19 38 0.46 0.62 39 0.71 0.29


11

Wedge nos. 1 2 3 4 5 6 7 8 9 10 Slot nos.

40 0.50 0.35 41 0.52 0.42 42 0.35 0.29 43 0.19 0.44 44 0.62 0.58 45 0.32 0.40 46 0.45 0.24 47 0.64 0.32 48 0.29 0.43 49 0.21 0.69 50 0.36 0.15 51 0.62 0.33 52 0.56 0.45 53 0.29 0.46 54 0.75 0.38


12

ELECTRICAL MEASUREMENTS

1. Insulation Resistance, Polarization Index & Dielectric Discharge Ratio of Stator (at 5 kV, before cleaning):

Parameter R - Phase Y - Phase B - Phase R01 (GΩ) 3.39 3.01 3.15 R10 (GΩ) 16.4 14.9 15.1 R30 (GΩ) 41.4 43.3 41.7

PI 4.84 4.95 4.78 DD 1.25 1.24 1.24

Leakage Current (nA) 127.0 121.0 126.0 Capacitance (nF) 211.0 211.0 211.0

2. Insulation Resistance, Polarization Index & Dielectric Discharge Ratio of Stator (at 5 kV, after overhauling):

Parameter R - Phase Y - Phase B - Phase R01 (GΩ) 2.75 2.59 2.81 R10 (GΩ) 15.70 16.10 17.20 R30 (GΩ) 35.60 41.20 41.30

PI 5.73 6.23 6.12 DD 1.48 1.49 1.40

Leakage Current (nA) 147.0 127.0 127.0 Capacitance (nF) 213.0 213.0 210.0

3. Insulation Resistance of Rotor, Exciter Rotor & PMG (250 V):

Main Rotor 4.64 GΩ PMG Stator 3.16 GΩ Excitation Field 2.01 GΩ Exciter Rotor 560 MΩ


13

4. Resistance of Stator, Rotor, Exciter & PMG (with digital micro-ohmmeter):

Main Stator (Temp. 30° C): R1 – R2 Y1 – Y2 B1 – B2

5.03 mΩ 4.99 mΩ 5.04 mΩ

Main Rotor (Temp.30° C): 231 mΩ

Exciter stator (F1-F2) (Temp. 30° C): 2.219 mΩ Exciter Rotor (Temp. 30° C): R – Y Y – B B – R

5.55 mΩ 5.59 mΩ 5.52 mΩ

PMG (Temp. 30° C): R – Y Y – B B – R

71.92 mΩ 71.50 mΩ 71.86 mΩ

5. Generator Stator Winding Circuit Analysis with All Test IV (400 Hz): R Phase Y Phase B Phase

Resistance (Ω) 0.006 0.005 0.006

Impedance (Ω) 6 6 6

Inductance (mH) 1.23 1.24 1.23

I/F (%) -46 -45 -45

Phase angle (º) 57 57 57

6. Generator Rotor Winding Circuit Analysis with All Test 31 (400 Hz): Resistance (Ω)

Impedance (Ω) 33.5

Inductance (mH)

I/F (%) -38

Phase angle (º) 52

7. Exciter Field Winding Circuit Analysis with All Test IV (200 Hz): Resistance (Ω)

Impedance (Ω) 280

Inductance (mH) 229

I/F (%) -39

Phase angle (º) 60


14

8. Exciter Rotor Winding Circuit Analysis with All Test IV (400 Hz): U PHASE V PHASE W PHASE

Resistance (Ω)

Impedance (Ω) 0.26 0.26 0.26

Inductance (mH) 0.160 0.161 0.160

I/F (%) -2 -2 -2

Phase angle (º) 4 4 4

9. PMG Stator Winding Circuit Analysis with All Test IV (400 Hz): U PHASE V PHASE W PHASE

Resistance (Ω)

Impedance (Ω) 2.11 2.11 2.11

Inductance(mH) 0.861 0.862 0.860

I/F (%) -23 -24 -24

10. Diode Healthiness:

Diode No. Forward Bias Voltage (mV)

1 419 2 419 3 376 4 378 5 386 6 392 7 423 8 432 9 371

10 371 11 419 12 419 13 383 14 421 15 429 16 381 17 376 18 378


15

11. Step Voltage Test at 5 kV (by Tera-ohm meter):

Insulation Resistance (GΩ) Applied Voltage (V)

R Phase Y Phase B Phase

1058 53.50 5.91 1000.0

2108 6.92 4.81 10.10

3158 6.01 5.12 7.27

4205 6.08 5.57 6.94

5261 6.23 5.87 6.93

12. Digital surge comparison test of rotor winding (RSO): Connection between +ve to –ve:

Connection Reversed:

Perfectly congruent waveforms reveal that no inter-turn & earth faults are present in the rotor winding insulation. The rotor winding insulation system is in healthy condition.


16

13. Digital surge comparison test of stator winding:

R Phase:

Y Phase:

B Phase:


17

14. Tan Delta & Capacitance Test:

TAN DELTA CURVE

0

0.5

1

1.5

2

2.5

3

0 1000 2000 3000 4000 5000 6000 7000

APPLIED VOLTAGE (V)

TAN D

ELTA

(%)

R PHASEY PHASEB PHASE

CAPACITANCE CURVE

207

207.5

208

208.5

209

209.5

210

210.5

211

0 1000 2000 3000 4000 5000 6000 7000

APPLIED VOLTAGE (V)

CAPA

CIT

ANCE

(nF)

R PHASEY PHASEB PHASE

APPLIED VOLTAGE

(kV)

TAN DELTA (%) R Y B

CAPACITANCE (nF) R Y B

1.5 2.002 1.876 1.966 209.3 209.6 207.2

3 2.044 1.905 1.888 209.7 209.7 207.4

4.5 2.047 1.911 1.957 209.9 209.9 207.7

6 2.420 2.108 2.282 210.7 210.2 208.5 TIP-UP

(%) 0.14 0.14 0.11 0.67 0.29 0.63


18

15. Flux Loop Test on Generator Stator:

Number of turns: 3 Applied voltage: 440 V. Current passed: 140 Amps. Duration: 2 hrs Amb. Temp.: 280 Temp. after 1 hour 340 Purpose: Stator core hot spot checking & uniform heating of stator

core for drying out. No hot spot was observed. Stator core surface: Scanned by Raytek Infrared Thermometer Temperature difference at any two spots did not exceed 10° C Temperature monitoring chart (using above method):

Temperature 0C

Date

Time

Current (Amps)

Core (top)

Core (bottom)

EE Winding

TE Winding

10.02.08 20:00 HRS 134 24 24 24 24

21:00 “ 29 28 27 26

22:00 “ 32 31 29 28

23:00 “ 36 35 32 31

11.02.08 0:00 “ 40 38 32 31

1:00 “ 43 41 33 33

2:00 “ 45 43 38 38

3:00 “ 47 45 41 40

4:00 “ 51 50 41 41

5:00 “ 54 51 44 44

6:00 “ 57 55 44 44

7:00 “ 60 56 48 46

8:00 “ 60 56 48 46

9:00 “ 60 56 48 46

10:00

Stopped the heating and washing & cleaning cycle was done on stator winding

11.02.08 13:00 139 54 52 41 42

14:00 “ 55 54 42 44

15:00 “ 59 56 45 45

16:00 “ 63 59 49 48

17:00 “ 60 62 52 51


19

Temperature

0C

Date

Time

Current (Amps)

Core (top)

Core (bottom)

EE Winding

TE Winding

18:00 137 67 63 55 53

19:00 “ 69 66 57 56

20:00 “ 70 69 58 57

21:00 136 71 70 59 58

22:00 Washing and cleaning cycle was done in hot condition

12.02.08 1:00 126 74 74 54 53

2:00 75 74 56 54

3:00 76 75 58 57

4:00 77 76 59 58

5:00 78 77 60 59

6:00 79 77 61 60

7:00 79 76 61 60

Heating stopped for varnishing


20

16. Computerized Digital ELCID test:

Stator Core Details: No of slots : 54 Core length without step packets : 2.37 m

Standard Test Details: The required trace winding test voltage at 4% excitation level is given by 0.04 * Vp-p Vt = ----------------- 2√3 k Tp Vt - Test voltage measured in trace winding Vp-p - Rated phase - to - phase voltage Tp - Turns in series per phase k - Pitch factor (A value of 0.92 is used for all generators) From the above formula single turn excitation voltage at 4% of rated flux : 15.34 V Excitation Current : 10 A No of excitation turns : 9 Note:

i) In the graphs x - axis represents slot length excluding step packets & Y-axis represents leakage currents.

ii) Slot numbering was taken as per marked by the customer approximately at 6 'o clock position as Slot # 1 and progressed in clockwise direction from Exciter end (NDE)

All the slots were scanned with Chattock coil fitted on sense head trolley and the graphs showing leakage currents with core length were recorded. The leakage currents found in all the slots were less than the threshold value of 100 mA, indicating the healthiness of the core.


21


22


23


24


25


26


27

17. Off – Line Partial Discharge Analysis Test: Test was conducted by connecting 80 pF Epoxy Mica Capacitive Coupler to the energized winding and other LV side of the coupler is connected to the instrument via termination box. AC high voltage of 6 kV is applied between each phase and ground for 10 minutes. After 10 minutes the partial discharges graphs showing magnitude, pulse count and polarity of each individual phase are recorded. Test results are given overleaf.

Normalized Quantity Number

(NQN)

Maximum Pulse Amplitude

(Qmax)

Voltage

(kV)

Phase

Negative Positive Negative Positive

Gain

R 935 972 533 533 Y 645 731 300 300

6.0

B 876 922 466 433

3

Predominance of positive NQN values in all the phases indicates that the partial discharges are at semi-conductive coating / surface. The most likely locations for this activity are the coil sides within the slot or at the slot exits. Level of NQN and Q max values indicate the symptoms of insulation system ageing. Since this is the first time that the PDA test is conducted on stator winding, these values may be taken as base values for future reference and for trend analysis.


28

R – PHASE: A) PULSE HEIGHT: B) MAX. PULSE AMPLITUDE:

C) NQN: D) PULSE DISTRIBUTION


29

Y PHASE : A) PULSE HEIGHT B) MAX. PULSE AMPLITUDE:

C) NQN : D) PULSE DISTRIBUTION:


30

B PHASE: A) PULSE HEIGHT B) MAX. PULSE AMPLITUDE:

C) NQN: D) PULSE DISTRIBUTION:


31

Empath 2000 4.4 Analysis Results PERFORMANCE SUMMARY Bottom Line X This generator is operating normally, no action is required. This generator exhibits suspicious operation, trending of the generator is warranted. This generator exhibits abnormal indications, action is warranted, NOW. Power Factor Commentary Power factor exceeds 0.85. X Power factor is below 0.85, see detailed report. Current Commentary X Current variation is within normal limits. Current variation is beyond normal limits, see detailed report. Voltage Commentary X Voltage variation is within normal limits. Voltage variation is beyond normal limits, see detailed report. RMS voltage differs from nameplate by more than 5%. Load Commentary X Load on the generator is consistent with nameplate values. Load on the generator exceeds nameplate values, see detailed report. Load on the generator is less than 25%. Phase Connection Commentary X Connections are normal. Voltage ground reference is NOT neutral. Loose connection. Stator Commentary X Stator health is normal. Stator mechanical health is questionable. Turn to turn short. Harmonic Distortion Commentary X There is no evidence of harmonic distortion. There is evidence of harmonic distortion, see detailed report.


32

INPUT SUMMARY NAMEPLATE INFORMATION

Units Manufacturer BHEL Serial Number 1322 Model Number TARI 800-26P Generator type Generator Power 30000.0 KW RPM 3000 Rpm AC/DC AC Poles 2 Phases: 3 Voltage 11000.0 Volt Full Load Current 1968.00 Amp Number Stator Slots 54 Rotor Bars 24 Torque 95414 N.m CT Ratio 3000.000 PT Ratio 100.000 Duty Cycle **** Service Factor 115 Frame Size **** Insulation Type F Ambient Temperature 70.0 F° Generator efficiency -1.000 Power factor -1.000 LEGENDS: Impedance = Complex Impedance = vi/ci CF = Crest Factor = (waveform peak)/(waveform rms) THDF = Transformer Harmonic De-rating Factor = sqrt (2)/CF, % VDF = Voltage De-rating Factor = 100 - (voltage unbalance, %)^2, % Thd = Total harmonic distortion +Ve = Positive sequence harmonic -Ve = Negative sequence harmonic Zero = Zero sequence harmonic


33

Detailed Calculations

Running Speed = 49.986 Hz / 2999 Rpm Load = 75.0 %

Time RMS Peak CF Current 1 1470.000 2424.300 1.649 Current 2 1440.000 2127.000 1.477 Current 3 1440.000 2172.000 1.508 Average 1450.000 2241.100 1.545 % dev 1.4 8.2 6.8

THDF = 91.5

Time RMS Peak CF Voltage 1 11110.000 15823.000 1.424 Voltage 2 11120.000 15719.000 1.414 Voltage 3 11140.000 15772.000 1.416 Average 11123.000 15771.000 1.418 % dev 0.1 0.3 0.4

VDF = 100.0

App. Power Real Power Reac. Power Power factor Impedance kVA kW kVARS Phase 1 0.795 7.558 9437.400 7500.000 5728.400 Phase 2 0.813 7.722 9230.400 7500.000 5380.500 Phase 3 0.813 7.736 9230.400 7500.000 5380.500 Avg/Total 0.807 7.672 27898.000 22500.000 16489.000 % dev 1.5 1.5

Demand Pwr = 22500.0 KW

Harmonic Distortion Results: Voltage input, from 49.988 Hz harmonics THD Odd % THD Even % +ve% -ve % Zero % THD All % Current 1 0.586 0.561 0.356 0.604 0.409 0.811 Current 2 *** *** *** *** *** Current 3 *** *** *** *** *** Voltage 1 0.210 0.141 0.154 0.149 0.089 0.264 Voltage 2 *** *** *** *** *** Voltage 3 *** *** *** *** ***


34

Figure- 1: Current Harmonic distortion graph

Figure- 2: Voltage Harmonic distortion graph

Description: Plain bearings

Harmonic distortion table Hz Cur1 Vlt1 Cur2 Vlt2 Cur3 Vlt3 50 1589.7 10633 *** *** *** *** 100 5.1 0 *** *** *** *** 150 4.1 5 *** *** *** *** 200 3.8 0 *** *** *** *** 250 6.8 14 *** *** *** *** 300 2.6 0 *** *** *** *** 350 2.3 33 *** *** *** *** 400 1.8 0 *** *** *** *** 450 1.7 19 *** *** *** *** 500 2.0 0 *** *** *** *** 550 1.4 10 *** *** *** *** 600 1.3 0 *** *** *** *** 650 2.1 19 *** *** *** ***


35

Figure-3 Ch-1 Current-1

Figure-4 Ch-1 Current-1

Figure-5 Ch-2 Voltage-1

Figure-6 Ch-2 Voltage-1


36

Figure-7 Ch-9 Current-1 RMS

Figure-8 Ch-1 Current-1 spectra

Figure-9 Ch-9 Current-1 RMS spectra-Demod


37

GTG-5 - DE

orders0 20 40 60 80 100

mm

/s rm

s

0

1

2

O/All 3.068 mm/s rms

1

0

1

0

Machine Note (10/18/2005 3:08:56 PM)30 MW, 3000 RPM, 11 kV, 2099 A, BHELSr. No. 1336Point Note (10/11/2005 11:42:29 AM)Plain Bearing

HorizontalVel Freq 5000 Hz3/6/2008 2:27:28 PM

O/All 3.068 mm/s rms2998.203 RPM

VerticalVel Freq 5000 Hz3/6/2008 2:28:21 PM


AxialVel Freq 5000 Hz3/6/2008 2:28:38 PM


GTG-5 - NDE

orders0 20 40 60 80 100

mm

/s rm

s

0

1

2

3

4

5

6


5

0

5

0

Machine Note (10/18/2005 3:08:56 PM)30 MW, 3000 RPM, 11 kV, 2099 A, BHELSr. No. 1336Point Note (10/11/2005 11:41:58 AM)Plain bearings







VIBRATION ANALYSIS:


38

GTG-5 - Exciter NDE

orders0 20 40 60 80 100

mm

/s rm

s

0123456789


6

0

6

0

Machine Note (10/18/2005 3:08:56 PM)30 MW, 3000 RPM, 11 kV, 2099 A, BHELSr. No. 1336







GTG-5 - Exciter NDE

revs0 2 4 6 8 10

g

-10

0

10

O/All 1.209 g rms

0

-10

0

-10

Machine Note (10/18/2005 3:08:56 PM)30 MW, 3000 RPM, 11 kV, 2099 A, BHELSr. No. 1336

Bearing condition is poor, significant impacting evident.

HorizontalAcc Time 213 ms3/6/2008 2:34:58 PM

O/All 0.427 g rms2998.203 RPM

VerticalAcc Time 213 ms3/6/2008 2:34:15 PM

O/All 1.209 g rms2998.203 RPM

AxialAcc Time 213 ms3/6/2008 2:34:36 PM

O/All 0.64 g rms2998.203 RPM


39

ACOUSTIC EMISSION CHARTS:

Documents

DETAILED REPORT ON OVERHAULING OF 30 MW GTG · PDF fileDETAILED REPORT ON OVERHAULING OF 30 MW GTG # 5 AT RELIANCE INDUSTRIES LTD., HAZIRA ... 4. Resistance of Stator, Rotor,