Electrical Engineering ⇒ Topic : Transformer specifications
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DJ
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TRANSFORMER SPECIFICATIONS The transformer specifications give the rating and performance expectations of the tranformer. These are broadly as mentioned below : 1. kVA rating; 2. Rated voltage; 3. Number of phases (1-phase or 3-phase) 4. Rated frequency; 5. Connections (A or Y for 3-phase transformer); 6. Tappings if any; 7. Type of core (core or shell); 8. Type (power or distribution); 9. Ambient temperature (generally average 40°C) 10. Type of cooling. (I)Cooling medium air, oil or water (II)Circulation type natural or forced (III)Simple or mixed cooling. 11. Temperature rise above ambient in °C depending upon the class of vvinding insulation. 12. Voltage regulation (i)Per cent or per unit at full-load at 75°C unity pl. or 0-8 p.f. lag (II)Impedance per cent or per unit (III)Reactance per cent or per unit. 13. No-load current in amperes or per cent of rated current at rated voltage and rated frequecy. 14. Efficiency in per cent or per unit at full 1/2load, 3/4load, load at unity pl. or 0.8 p.f. | |
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