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