Core: The transformer core is mitered cut from cold-rolled grain-oriented silicon steel (CRGO) of the highest quality, with stepped limb and yoke so as to obtain a maximum possible low loss magnetic circuit, clamped with heavy steel channels and tie rod.

 

Insulation: The dielectric circuit of transformer which isolates the magnetic and electric circuit and their parts maintaining high insulation level is formed by insulating paper, pressboards, Bakelite and transformer oil of highest quality. Insulation is Class F according to IEC.

 

Winding: The HT and LT windings, designed with low current densities, are constructed in multilayered cylindrical structures with off ducts ensuring sufficient mechanical and dielectric strength to survive under fault conditions.

 

Tank The tank is designed and constructed with mild-steel along with radiators, conservator and other features, forms a complete unit of sufficient mechanical strength and provides optimum support for heat dissipation under energized conditions.

 

Radiator: Radiators are built of cylindrical tubes made by bending mild-steel sheets. These tubes are joined by mild-welding to make the tubes leak proof. Number of tubes required are calculated to provide 65°C Oil temperature rise above ambient.

Transformers comply with the following specifications:

  • Three-Phase transformers, for indoor or outdoor use (installation to be specified)
  • Step-Down type, Step-Up on request
  • Rated frequency: 50Hz, 60Hz on request
  • Maximum ambient temperature 40°C
  • Mineral oil immersed (Other dielectric on request)
  • Breathing-type transformers with integral filling
  • Cover bolted on tank
  • ONAN type natural cooling
  • Standard anti-corrosion surface treatment and coating

 

 

Significant Characteristics of our provided different capacities of

Oil Immersed HV/LV Distribution Transformers

 

Capacity
(kVA)
Losses (watt) %

Imp

% Regulation
At Unity Power
factor
% Efficiency
At Unity Power
factor
Out Line Dimensions
Approx. (cm)
Oil
(Liter)
Total
Weight
(kg)
No
Load
Load at
75°C
At unity power
factor
At Full Load H L W
11000/415V, 3-PHASE TRANSFORMER
50 150 925 4 1.68 97.85 118 94 58 140 580
100 245 1700 4 1.62 98.05 132 100 63 180 650
150 320 2412 4 1.40 98.17 145 105 88 220 900
200 435 2880 4 1.20 98.37 150 112 93 230 975
250 520 3265 4 1.22 98.48 158 113 95 270 1100
315 580 4500 4 1.15 98.38 157 120 97 350 1250
400 722 5420 4 1.10 98.44 162 123 98 390 1450
500 865 6275 5 1.05 98.57 165 124 102 425 1725
630 920 7740 5.5 0.98 98.62 170 136 103 500 1970
750 1150 8850 6.0 0.94 98.66 185 155 112 625 2250
800 1300 9800 6.0 0.96 98.61 225 170 113 650 2575
1000 1650 11600 6.0 0.99 98.67 215 185 115 800 2850
1250 1820 12300 6.5 0.95 98.87 225 190 116 1000 3725
1500 2100 13275 6.5 0.87 98.97 230 200 120 1200 4300
2000 2650 16470 6.5 0.83 99.04 250 210 135 1450 4750
2500 3140 19700 7 0.82 99.08 285 220 150 1800 5600
3000 3420 22860 7 0.77 99.12 300 230 170 2050 6350

 

 

 

 

 

Capacity
(kVA)
Losses (watt) %

Imp

% Regulation
At Unity Power
factor
% Efficiency
At Unity Power
factor
Out Line Dimensions
Approx. (cm)
Oil
(Liter)
Total
Weight
(kg)
No
Load
Load at
75°C
At unity power
factor
At Full Load H L W
33000/415V, 3-PHASE TRANSFORMER
100 260 1700 4.5 1.60 98.045 133 102 63 198 790
150 340 2530 4.5          1.42 98.08 146 107 88 240 955
200 465 2950 4.5 1.63 98.29 151 114 93 285 1010
250 580 3340 4.5 1.20 98.43 155 116 95 360 1140
315 640 4725 4.5 1.18 98.29 158 122 97 450 1300
400 750 5760 4.5 1.13 98.37 163 125 98 495 1520
500 900 6500 4.5 1.10 98.52 167 127 102 560 1800
630 975 8125 4.5 0.95 98.55 172 138 103 700 2020
750 1240 9200 5.0 0.92 98.60 187 158 112 785 2340
800 1350 10000 5.5 0.90 98.58 202 173 113 820 2670
1000 1725 12100 5.5 0.97 98.61 220 188 115 870 2960
1250 1880 12950 5.5 0.93 98.81 227 193 116 1150 3850
1500 2200 13940 6.0 0.85 98.92 232 195 120 1260 4425
2000 2750 17300 5.5 0.86 98.99 253 197 135 1510 4870
2500 3400 20700 7.0 0.83 98.03 287 203 150 1865 5730
3000 3575 24000 7.0 0.79 99.08 303 233 170 2150 6475