This transformer can be replaced the existing transformer, So the connection of HV and LV size as well as cooler water inlet/outlet location should be similar to existing transformer.3
30 MVA 33KV LF three phase transformer ladle refining furnace transformer with on load tap changer
L.F.THREE PHASE TRANSFORMER
Rated Power:30MVA-50HZ
ON LOAD TAP CHANGER
OFWF COOLING
INDOOR INSTALLATION
VARIABLE FLUX REGULATION(V.F.R)
- TEMPERATURE RISE ON MAX 35°C INLET WATER TEMPERATURE: 55 K WINDING BY RESISTANCE, 50 K OIL / AT 30MVA
- TEMPERATURE RISE ON MAX 35°C INLET WATER TEMPERATURE: 65 K WINDING BY RESISTANCE, 60 K OIL / AT 33MVA
. - COOLING WATER FLOW: 37 m3/h - WATER PRESSURE DROP: 0.22 bar MAX OPERATING WATER PRESSURE: 7+1 bar
- 2 COOLERS INSTALLED, 1 OF THEM IN STAND-BY
- DUTY CYCLE: 33 MVA CONTINUOUS
. -CT1 : RATIO 600/2A- 30VA-CL.3 FOR W.T.I
-CT2 -CT3-CT4 : RATIO 600/5A - 30VA- CL. 5P10 FOR PROTECTION
-CT5-CT6-CT7 : RATIO 600/1A- 50VA-CL.1- FINAL RATIO 45000/5A
- TANK PROVIDED FOR COMPLETE OIL FILLED TRANSFORMER LIFTING AND FOR VACUUM TREATMENT.
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1.1 TECHNICAL DESCRIPTION (Solution 1: Without booster transformer ) |
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1.1.1 GENERAL TECHNICAL DATA |
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Highest voltage |
36kV |
50Hz |
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Operating voltage |
33 kV±5% |
50Hz |
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Voltage for aux. drivers |
380V |
50Hz |
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Control voltage |
220V |
50Hz |
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Interlock voltage |
220V |
50Hz |
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PLC signals |
24V |
DC |
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Ambient temperature max./min. |
45 / - 10 |
Deg. C |
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Altitude |
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 |
1800 MVA |
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Operating voltage |
33kV±5% |
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Frequency |
50Hz ±1% |
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Operation |
Continuously |
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Rated Power |
30 MVA |
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Overload capacity |
33 MVA |
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Rated primary current |
524.9 A (+ 10% Overload) |
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Vector group |
YD5 |
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Secondary connection |
Closed Delta |
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Secondary voltage range |
450 –260 V (460 V at tap position 12) (See APPENDIX: Data for reference ) |
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Constant power |
450 V |
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Constant current |
422-260 V |
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Secondary current |
38.49KA (+ 20% Overload) |
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Insulation level Winding: Um: AC: BIL: |
MV LV 52 kV 1.1 kV 95 kV 8 kV 250 kV |
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Protection level |
IP 54 |
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Regulation method |
Variable flux, Tapping with tapping winding |
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Short-circuit impedance voltage |
7.5 % (at LV max. Voltage) |
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Short circuit duration |
3 sec |
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