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Oil filled power transformer
Distribution transformer 11kV ,15kV,22kV,33kV  up to 25000kVA Product Description:…
Oil filled power transformer

Oil filled power transformer

Detailed description

  • Description
  • Service environment
  • Standard
  • Main technical parameter

Distribution transformer 11kV ,15kV,22kV,33kV  up to 25000kVA


Product Description:

220kv on-load-tap-changing power transformer is made of high-quality silicon-steel sheets,and laminated by steps,it is advantageous in low loss,low noise ,low voltage partial discharge and  high anti short circuit  capacity.the dynamical and thermal stability of this transformer ,of which the coils are winded by high-quality oxygen-free copper wire as well as used pre-compressing brackets processes and interior and exterior structure.

1. Rated voltage:11kV,15kV, 20KV,22kV,30kV,33kV,34.5kV

2. Rated power:50kvA~25000kva

3, Two windings or three windings

4, On-load or no-load voltage tapping changer

5. Frequency:50HZ /60HZ

6. Vector group:Dyn11, Ynd11, Yna0d11 or others

7. Cooling:ONAN/ ONAF/ OFAF

8. Tap changer:7 levels; 13 levels; 17 levels etc

9. Rating plate:Yes (Rockwell brand or Customer brand)

10. Corrugated refrigeration panels:Yes ( Four sides of the transformer shell)

11. Parts:

1) Oil draining valve

2)Oil level indicator

3)Thermometer

4) oil conservator

5) Relay


1.1 Type: Outdoor Type


1.2 Normal use Environment: Elevation less than 1000m;
Temperature Range :-25 °C---+40°C
1.3 Especial Environment: Elevation more than 1000m;
Temperature Range :-45 °C----+40°C- 220kv oil immersed power transformer
1.4 Installation Site: Nothing corrode air, noting obvious dirty mark.



1.1  IEC 60076 power transformer

1.2  GB1094.3,5-2003 power transformer ower transformer
1.3  GB/T6457-1999 3-phase oil immersed power transformer technical parameters and  requirement.



220kV Three Phase Double Windings Power Transformer with Off-circuit Tap Changer

Rated capacity(KVA) Voltage ratio(KV) Vector group No-load loss(kw) Load loss(KW) No-load current(%) Short-circuit impedance(%)
HV LV
31500 242±2*2.5%  242±2*2.5% 6.3 YNd11 26 128 0.3 12~14
40000 6.6 31 149
50000 10.5 36 178
63000 11 41 208 0.2
75000 10.5 47 237
90000 11 50 272
120000 13.8 61 327
150000 11 83 380
160000 13.8 85 400 0.15
180000 15.75 90 436
240000 18 105 520
300000 20 140 620
360000 15.75 160 700
370000 18 168 720
400000 20 180 770
420000 185 800


Above mentioned parameter are only for reference, ROCKWILL is able to design products according to specific requirements from end users.



220kv Three Phases Double Windings Power Transformer with Off-circuit Tap Changer

Rated capacity(KVA) Voltage ratio(KV) Vector group No-load loss(kw) Load loss(KW) No-load current(%) Short-circuit impedance(%)
HV LV
31500 242±2*2.5% 242±2*2.5% 63,66,69 YNd11 29 143 0.3 12~14
40000 34 167
50000 40 200
63000 47 234 0.2
90000 55 305
120000 70 365
150000 85 428
180000 90 485 0.15
240000 110 600




Above mentioned parameter are only for reference,ROCKWILL is able to design products according to specific requirements from end users.


220kv Three Phases Double Windings Power Transformer with On Load Tap Changer

Rated capacity(KVA) Voltage ratio(KV) Vector group No-load loss(kw) Load loss(KW) No-load current(%) Short-circuit impedance(%)
HV LV
31500 220±8*1.25% 6.3/6.6/10.5/11/35/37/38.5 YNd11 25 128 0.3 12~14
40000 32 148
50000 35 179
63000 45 208 0.2
90000 10.5/11/35/37/38.5 55 272
120000 69 327
150000 80 383
180000 90 442 0.15
120000 66,69 70 327 0.2
150000 85 388
180000 95 450 0.15


Above mentioned parameter are only for reference,ROCKWILL is able to design products according to specific requirements from end users.


220kv Three Phases Double Windings Power Transformer with Off Circuit Tap Changer

Rated capacity(KVA) Voltage ratio(KV) Vector group Step-up   combination Step-down   combination No-load current(%) Short-circuit impedance(%)
No-load loss(kw) Load loss(KW) No-load loss(kw) Load loss(KW) Step-up Step-down
HV MV LV
31500 220±2*1.25%       242±2*1.25% 115,121 6.3/6.6/10.5/11/35/37/38.5 Yna0d11 19 111 17 94 0.3 HV-MV 12~14  HV-LV  8~12  MV-LV  14-18 HV-MV 8~10  HV-LV  28~34  MV-LV  18-24
40000 22 136 20 114
50000 26 161 23 136
63000 30 190 27 162 0.2
90000 10.5/11/13.8/15.75/18/35/37/38.5 38 255 34 221
120000 47 321 42 272
150000 55 383 49 323
180000 62 438 56 366 0.15
240000 74 563 67 476

Above mentioned parameter are only for reference,ROCKWILL is able to design products according to specific requirements from end users.



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