This transformer can replace the existing transformer, so the connection of HV and LV sizes and the location of the water inlet/outlet of the cooler should be similar to the existing transformer. 3
30 MVA 33KV LF three-phase transformer ladle refining furnace transformer with on-load tap changer
L.F. Three-phase transformer
power rating: 30mva-50hz
ON LOAD Tap changer
OFWF Cooling
Indoor installation
Variable Flux Regulation (V.F.R)
-up to 35°C temperature rise inlet water temperature: 55 K resistance winding, 50 k oil/at 30MVA
-Up to 35°C inlet water temperature increase: 65 K resistance winding, 60 k oil/at 33MVA
.-Cooling water flow: 37 cubic meters/h-Water pressure drop: 0.22 bar Maximum working water pressure: 7 1 bar
-2 coolers are installed, 1 of which is in standby
-Duty cycle: 33 MVA continuous
. -CT1: W.T. I ratio 600/2a-30va-cl.3
-CT2 -CT3-CT4: Ratio 600/5A-30VA-CL. 5P10 for protection
-CT5-CT6-CT7: Ratio 600/1A- 50VA-CL.1-Final Ratio 45000/5A
-Provide complete oil-filled transformer for lifting and vacuum handling of the tank.
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1.1 Technical Description(solution 1: without step-up transformer) |
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1.1.1 General Technical Data |
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maximum voltage |
36kV |
50Hz |
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working voltage |
33 kV ± 5% |
50Hz |
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aux voltage. Driver |
380V |
50Hz |
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control voltage |
220V |
50Hz |
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Interlock voltage |
220V |
50Hz |
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PLC signal |
24V |
DC |
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Ambient temperature max/min. |
45/ - 10 |
Deg.C |
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elevation |
1500 |
m |
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Humidity |
80 |
% |
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1.1.2 Transformer Data |
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system short circuit capacity |
1800MVA |
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working voltage |
33kV ±5% |
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frequency |
50Hz ± 1% |
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Operation |
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RatedPower |
30MVA |
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overloadCapacity |
33 MVA |
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Rated main current |
524.9A (+10% overload) |
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vector group |
YD5 |
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Secondary connection |
CloseDelta |
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Secondary voltage range |
450-260V (460V12) (see Appendix: Data for reference) |
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constant power |
450V |
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Constant current |
422-260V |
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Secondary current |
38.49KA (+ 20% overload) |
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insulation class winding: well: AC: BIL: |
MV LV 5 2 kV1.1kV 95 kV8kV 250 kV |
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protection level |
IP54 |
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adjustment method |
variable flow, tapping with a tapping winding |
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short-circuit impedance voltage |
7.5% (LV maximum voltage) |
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short circuit duration |
3 seconds |
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