BIS - 1180
Features Of BIS - 1180

  • We manufacture ISI approved distribution transformer starting from 100 KVA to 2500 KVA under BIS-1180(Jan 2016) of all voltage class and covering all level of efficiency.
  • distribution transformer have two different variant. offload distribution transformer and onload distribution transformer


Maximum Total Losses Upto 11 Kv Class Transformers As Per BIS-1180
IS 1180 (PART 1): 2014
Sl No. Rating (kVA) Impedance (Percent) Maximum Total Loss (W)
Energy Efficiency
Level 1
Energy Efficiency
Level 2
Energy Efficiency
Level 3
Energy Efficiency
Level 4
Energy Efficiency
Level 5
50 Percent Load 100 Percent Load 50 Percent Load 100 Percent Load 50 Percent Load 100 Percent Load 50 Percent Load 100 Percent Load 50 Percent Load 100 Percent Load
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13)
i) 250 4.50 980 2930 920 2700 864 2488 811 2293 761 2113
ii) 315 4.50 1025 3100 955 2750 890 2440 829 2164 772 1920
iii) 400 4.50 1225 3450 1150 3330 1080 3214 1013 3102 951 2994
iv) 500 4.50 1510 4300 1430 4100 1354 3909 1282 3727 1215 3554
v) 630 4.50 1860 5300 1745 4850 1637 4438 1536 4061 1441 3717
vi) 800 5.00 2287 6403 2147 5838 2015 5323 1892 4853 1776 4425
vii) 1000 5.00 2790 7700 2620 7000 2460 6364 2310 5785 2170 5259
viii) 1250 5.00 3300 9200 3220 8400 3142 7670 3066 7003 2991 6394
ix) 1600 6.25 4200 11800 3970 11300 3753 10821 3547 10363 3353 9924
x) 2000 6.25 5050 15000 4790 14100 4543 13254 4309 12459 4088 11711
xi) 2500 6.25 6150 18500 5900 17500 5660 16554 5430 15659 5209 14813
Off Load Distribution Transformer
On Load Distribution Transformer