DescriptionQty. (Nos)VoltageRating (KW)Diversity factorDemand
factor
Induced draft fan motor63.3 KV4302.080%
Forced draft fan motor63.3 KV2702.080%
Cooling tower pump motor43.3 KV3352.080%
Boiler feed pump motor23.3 KV18002.080%
Total HT Load(KW)
DescriptionQty. (Nos)VoltageRating (KW)Diversity factorDemand
factor
Makeup water pump motor3415 V901.580%
Air compressor motor3415 V1151.570%
Air heater2415 V30190%
Auxiliary water pump2415 V751.580%
CT fan motor4415 V45160%
Condensate extraction pump4415 V22280%
Chiller compressor3415 V551.580%
Air handling unit3415 V451.580%
Auxiliary oil pump2415 V22270%
Air handling, cooling tower, and miscellaneous other load6415
V17280%
NGL firing pump6415 V55370%
NGL unloading pump2415 V7.51.550%
Lighting, UPS and miscellaneous others-415V151.8I 80%
Total LT Load (KW)
The Loads of Industry are given in a Table Above. Find1)The
Capacity of Transformer Required2)Fault current at 3.3 kV Bus and
0.415 kV Bus. The Primary of Transformer is supplied by 11 kV Bus.
The Fault level at 11 kV is 750 MVA3)Select CB/Fuse 4)Select Cables
for 5% Regulation5)Economic evaluation of Transformer
It is required to calculate the load for the residential as well
as commercial set-up. There are two ways to accomplish the above
task. One is to calculate the load as per the number of points
provided, and the other is calculation of load based on covered
area. In addition to the above, the housing complex has got two
number of lifts in each block, area lighting, fire and drinking
water pumps. The details are given belowFind Capacity of
Transformer
Draw a single line diagram
Find cable sizes for 5% regulation
SISL Description No.No. of housesArea (sq. metre)5A socket
(Nos)15A socket (Nos)40W lamp (Nos)Ceiling fan (Nos)100W lamp
(Nos)Exhaust fan (Nos)
1BLOCK-1
Type-114801257541
Type-21410015710752
2 BLOCK-2
Type-31812518911953
Type-4181502011121063
3 BLOCK-3
Type-5121752213151283
Table 1.5
Sl.No. DescriptionQty (Nos)Rating (KW)
1Lifts (8 Passengers)65
2Fire pumps120
3Drinking water pumps210
4Common area lighting450.055
55. Street lighting250.15
The housing complex also has a commercial complex. The load
details are given in Table 1.6.
Table 1.6
SL NO Description Nos. Area (sq. No. metre)5 A socket (Nos)15 A
socket (Nos)40 W lamp (Nos)Ceiling fan(Nos)100 W lamp (Nos) Exhaust
fan (Nos)
1Super market 1 125112520152510151
2Office rooms 5 1551512520550
3Shops 5 105101510101050
4Restaurant 1 100110015122012104
DescriptionQty. (Nos)VoltageRating (KW)Diversity factorDemand
factor
Induced draft fan motor63.3 KV4302.080%
Forced draft fan motor63.3 KV2702.080%
Cooling tower pump motor43.3 KV3352.080%
Boiler feed pump motor23.3 KV18002.080%
Total HT Load(KW)
DescriptionQty. (Nos)VoltageRating (KW)Diversity factorDemand
factor
Makeup water pump motor3415 V901.580%
Air compressor motor3415 V1151.570%
Air heater2415 V30190%
Auxiliary water pump2415 V751.580%
CT fan motor4415 V45160%
Condensate extraction pump4415 V22280%
Chiller compressor3415 V551.580%
Air handling unit3415 V451.580%
Auxiliary oil pump2415 V22270%
Air handling, cooling tower, and miscellaneous other load6415
V17280%
NGL firing pump6415 V55370%
NGL unloading pump2415 V7.51.550%
Lighting, UPS and miscellaneous others-415V151.8I 80%
Total LT Load (KW)
