OFF LOAD
DISTRIBUTION
TRANSFORMER
Features Of Off Load Transformer
TypeIndoor/ Outdoor Pad Mounted
Voltage Class3.3, 6.6, 11, 22, 33 Kv or special class by customer
Vector GroupDyn11, Dyn5, Dyn1 or other specified by customer
No. of phase3 phases
Frequency50/60 Hz
Tap Range±7.5 %, +5% in 2.5% steps or as per requirement of customer.
Winding MaterialCopper with multiple paper covering
Applicable StandardsBIS-1180, IS-2026, IEC 60076
PaintingEpoxy, Polyurethane or specified by customer
 
Applications
 
Maximum Total Losses Upto 11 kV Class Transformers As Per BIS-1180
Sr. No. KVA Impedance % Maximum Total Loss (W) @ 75˚ Celsius
LEVEL 1 LEVEL 2 LEVEL 3
50% 100% 50% 100% 50% 100%
1 250 4.5 1050 3150 980 2930 920 2700
2 315 4.5 1100 3275 1025 3100 955 2750
3 400 4.5 1300 3875 1225 3450 1150 3330
4 500 4.5 1600 4750 1510 4300 1430 4100
5 630 4.5 2000 5855 1860 5300 1745 4850
6 800 5.0 2459 7300 2287 6402 2147 5837
7 1000 5.0 3000 9000 2790 7700 2620 7000
8 1250 5.0 3600 10750 3300 9200 3220 8400
9 1600 6.25 4500 13500 4200 11800 3970 11300
10 2000 6.25 5400 17000 5050 15000 4790 14100
11 2500 6.25 6500 20000 6150 18500 5900 17500

Note: For Transformer having voltage class 22 Kv then permissible total loss shall not exceed by 5% of total loss as per above table and for 33 Kv Class permissible total loss shall not exceed by 7.5% of total loss as per above table.

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