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Monday, 18 May 2015

DG set rating sound level checklist

Diesel Generator

Diesel Generator Set Produces = 3.87 Units (KWH) in 1 Litter of Diesel.
Typical Requirement room size for DG set: for 25KW to 50KW = 10-30 Square meter, 62.5-100KVA = 30-45 Sq.meter.
DG noise levels to be less than 75dBA at 1 meter.
DG fuel storage tanks should be a maximum of 990 Litter per unit. Storage tanks above this level will trigger more stringent explosion protection provision.

Nominal rating in KVA
7.5,10,12.5,15,17.5,25,30,35,40,50,62.5,75,82.5,110,125,140,200,225,250,320,350,380,380,415,450,500,550,600,625,700,750,1010,1250,1500.
KVA                                                   Max. Sound Level
<9 KVA                                                          40 dB
10 KVA to 50 KVA                                       45 dB
51 KVA to 150 KVA                                     50 dB
151 KVA to 300 KVA                                   55 dB
DG set rating and sound level
301 KVA to 500 KVA                                   60 dB

Clear space required DG set
Sr.        KW rating       Area M2              Height
i)          25                   56                    3.6
ii)         48                   56                    3.6
iii)        100                  65                    3.6
iv)        150                 72                    4.6
v)         248                  100                  4.6
vi)        350                 100                  4.6
vii)       480                  100                  4.6

ref: national building code of India 2005 part 8 section 2
DG set checklist:
1. Check Name plate details.
2. External body of the Generator for any damage,
3. Condition of terminal box: tightness of nuts & bolts, missing bolts, condition of bushings.
4. Cable connections
5. Adequate support to cable with tray/ clamp etc.
6. Foundation bolts –Tightness
7. Check terminal bushings for any damage or looseness
8. Check for any blockage of ventilator openings
9. Checking of exciter/field/stator coils, AVR, Rectifier Bridge, brushes, surge suppressor or
Variable resistor (varistor) etc.
10. Checking of Engine Control Switches viz. LLOP, HWT, etc.
11. Checking of Annunciation Circuits.
12. Healthiness of protection circuits.
13. Proper functioning of Space Heaters.
14. Terminal Box :
·         Open up the Terminal Box and check following
·         The studs – No. of Studs, Nut/bolts and washers provided or not.
·         Terminals ends are numbered or not,
·         Tightness of the Terminations.
15. Condition of bearings
16. Oil lubrication (adequacy & Oil quality)
17. Earthing connections (body & neutral)
18. Protection circuits (testing and simulation tests)
19. Auto/manual starting and changeover system
20. Earthing connection: check
• Check for proper earthing materials and done with proper practice.
• Tightness of earthing studs.
• Socket/ lugs, if earthing is done with stranded bare /insulated conductor.
• Physical connection to dedicated earth electrodes.
21. Measure and record Insulation Resistance value with the help of an insulation tester
• Between Phase to Phase
• Phase to Earth
• Neutral to earth (neutral disconnected)
22. Measure & record PI (polarization Index) value. It should be greater than 2.
23. Continuity check for windings.
24. Ensure that the winding resistance values are equal in all the phases.
25. Earth resistance value (ensure that it is within recommended value)
26. Continuity of earthing conductor.
27. Whether the enclosure provides ease of maintenance.
28. Adequate shed with rain protector provided.
29. Whether earth pit no. earth resistance value & test date have been written on the earth pit
cover or by any convenient means.
30. Whether Location/ position of earth pit maintainable.
31. The gen sets should have nomenclature such as G1, G2, Set -1, Set 2 etc. for ease of
identification.

 In case of Acoustic Enclosure
Check the following:
a. Measure the noise level to ensure that it is as per CPCB norms. (Max 70db within 1
metre as per CPCB norms)
b. Adequacy of Illumination inside the enclosure
c. Functionality of Gas Detector.
d. Functionality of Emergency Shut Down Switch
e. Functionality of Blower fans
f. Remove any oil spillage.

Alternator Control panel
The followings shall be checked:
a. Check for any damage.
b. Check and tight Foundation Bolts.
c. Check for proper cabling and termination.
d. Check whether appropriate cable lugs/ sockets are used.
e. Earthing connections.
f. Checking and testing of protection scheme and relays
g. Check set values of protective component / equipment
34. After Generator is started, check following
a. Voltage building up at all the phases.
b. Excitation voltage.
c. Excitation current.
d. Healthiness of protection circuit
e. Healthiness of measuring instruments.
f. Healthiness of indicating lamps.
g. Emergency push button operation
h. Battery charger circuit.
i. Space heaters, if provided.
j. Load on the generator
k. Overheating of alternator/exciter/bearings
l. Speed whether steady or hunting (growling)
m. Audio visual annunciation


 Synchronization panel:
• Functionality of the Synchroscope.
• Healthiness of indicating lamps
• Healthiness of switches

 Electrical checks/ testing as recommended by OEM

Cummins Generator Drive, Prime Power Ratings ,50 Hz, 1500 rpm , pl confirm with manufacturer
 Low Horse Power Diesel Generator Sets
Nominal kVA rating
Engine Model
BHP rating at 1500 rpm
7.5
X1.3TAAG1
23
10
X1.3TAAG1
23
15
X1.3TAAG1
23
20
X2.7TG1
32
25
X2.7TAAG2
38
30
X2.7TAAG3
40
35
X3.6TAAG1
52
40
X3.6TAAG2
55
50
4B3.3TAAG11
84
62.5
4B3.3TAAG11
84
70
4BTAA3.9-G3
99
82.5
4BTAA3.9-G4
110
100
6BTAA5.9G9
159
125
6BTAA5.9G10
159
140
QSB 5.9G1
184
160
QSB 5.9G2
206

High Horse Power Diesel Generator Sets

Nominal kVA rating
Engine Model
BHP rating at 1500 rpm
180
QSB 6.7G11
234
200
QSB 6.7G12
256
275
QSL 9G7.2
345
300
QSL 9G7.1
363
330
QSL 9G7
402
365
QSN 14G1
448
400
QSN 14G2
487
440
QSN 14G3
531
500
KTAA19 G10
587
520
KTAA19 G11
614
600
QSK 19G6
782
660
QSK 19G6
782
640
QSK 19G7
828
700
QSK 19G7
828
750
KTA 38G10
987
830
KTA 38G10
987
810
KTA 38G11
1069
900
KTA 38G11
1069
1010
KTA 38 G5
1180
1250
KTA 50 G3
1470
1500
KTA 50 G8-I
1735
1875
QSK 60 G3
2165
2000
QSK 60 G4
2319
3000
OSK 78 G6
3371

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