| Rated power | ..……KVA | 500 | |||||||
| Type of transformer | – | Oil immersed ( Hermetically sealed ) | |||||||
| 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 | ………..% | 4 | |||||||
| NO – Load current | …..…..% | 1 | |||||||
| 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 | 860 | |||||||
| Load loss at 75 C | ……..Watt | 4950 | |||||||
| : 25 % of rate power | …….….% | 98.94 | |||||||
| Efficiency | : 50 % of rate power | …………% | 98.08 | ||||||
| at P.F. = 1 | : 75 % of rate power | ………..% | 98.79 | ||||||
| : 100 % of rate power | …..……% | 98.56 | |||||||
| Voltage regulation | : at P.F. = 0.8 | …….….% | 3.22 | ||||||
| : at P.F. = 0.9 | …….….% | 2.71 | |||||||
| : at P.F. = 1. | ….…….% | 1.17 | |||||||
| 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 | ||||||||
