| Rated power |
|
|
|
..……KVA |
|
3150 |
|
|
| Type of transformer |
|
|
|
– |
Oil immersed ( Hermeticall sealed tank ) |
| Standard |
|
|
|
|
– |
|
IEC 76 |
|
|
| Cooling System |
|
|
|
– |
|
ONAN |
|
|
| No. Of phase |
|
|
|
– |
|
3 |
|
|
| Frequency |
|
|
|
|
……….Hz |
|
50 |
|
|
| Rate of voltage : Primary |
|
|
……….V. |
|
22000 |
|
|
| : Secondary |
|
|
..………V. |
|
400/230 |
|
|
| Vector group |
|
|
|
– |
|
Dyn 11 |
|
|
| Tapping |
Type |
|
|
|
– |
Off circuit tap changer |
|
No. of steps |
|
|
– |
|
5 |
|
|
|
Percentage of tapping |
|
– |
|
2 x 2.5 % |
|
|
| Impedance voltage at 75 C |
|
|
………..% |
|
7 |
|
|
| NO – Load current |
|
|
|
…..…..% |
|
3 |
|
|
| Ambient temperature |
|
|
|
…..…….C |
|
40 |
|
|
| Average Temperature rise of winding |
|
…..…….C |
|
65 |
|
|
| Average Temperature rise of top oil |
|
…………C |
|
60 |
|
|
| Noise level not more than |
|
|
….……dB |
|
56 |
|
|
| No – Load loss |
|
|
|
……..Watt |
|
4100 |
|
|
| Load loss at 75 C |
|
|
|
……..Watt |
|
33000 |
|
|
|
|
: 25 % of rate power |
|
…….….% |
|
99.42 |
|
|
| Efficiency |
|
: 50 % of rate power |
|
…………% |
|
99.22 |
|
|
| at P.F. = 1 |
|
: 75 % of rate power |
|
………..% |
|
90.04 |
|
|
|
|
: 100 % of rate power |
|
…..……% |
|
98.84 |
|
|
| Voltage regulation |
: at P.F. = 0.8 |
|
…….….% |
|
3.22 |
|
|
|
|
: at P.F. = 0.9 |
|
…….….% |
|
2.71 |
|
|
|
|
: at P.F. = 1. |
|
….…….% |
|
1.29 |
|
|
| Impulse Withstand |
: Primary winding |
|
..…….KV. |
|
125 |
|
|
| Voltage |
|
: Secondary winding |
|
………KV. |
|
– |
|
|
| Power Frequency |
: Primary winding |
|
….…..KV. |
|
50 |
|
|
|
|
: Secondary winding |
|
………KV. |
|
3 |
|
|
| Terminal arrangement H.V. Side |
|
|
|
|
Cable |
|
|
|
|
L.V. Side |
|
|
|
|
Cable |
|
|
| Installation on |
|
|
|
|
Pole mounted / Plantform |
