AC/DC Arc Furnace and Ladle Furnace Transformers
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1 AC/DC Arc Furnace and Ladle Furnace Transformers Specification parameter Specify the requirements for 1. Environmental condition and standards Applicable standard Electrical standard Mechanical standard IEC / IEEE / GOST DIN, EN ISO / ANSI (with metric screw system) Location Indoor / Outdoor / Offshore / Explosion-proof Environment High pollution / Salty and or mist / Tropical / Artic Altitude m 1,000 m Ambient s Yearly average ambient Monthly average ambient Yearly maximum ambient Yearly minimum ambient C 20 C C 30 C C 40 C C -25 C Max. water inlet C 35 C 1
2 Specify the requirements for 2. Electrical design Design criteria Type Cooling type Oil-immersed 3-phase EAF transformer ODWF Rated power MVA 124 MVA Operating mode Continuous Rated frequency Hz 60 Hz Vector group Dd0 (internally-closed delta) Rated voltage kv 34.5 kv / kv Tapping range V V No. of steps/pos. 17/18 Overexcitation % 10% Rated current HV A 1,339 A Rated current LV ka ka (max ka) Short-circuit duration s 2 s Short-circuit power MVA max. 500 MVA Isolation level Highest voltage for equipment HV winding kv 36 kv LV winding kv 1.5 kv Rated power frequency HV winding kv 70 kv LV winding kv 10 kv Rated lightning impulse HV winding kv 200 kv LV winding kv 30 kv Rated switching impulse HV winding kv - LV winding kv - 2
3 AC/DC Arc Furnace and Ladle Furnace Transformers Voltage table Typical voltage values of AC/DC arc furnace and ladle furnace transformers Position S [MVA] LV phase current LV voltage [V] HV voltage [V] HV voltage [A] [ka] ,500 1, ,500 1, ,500 1, ,500 1, ,500 1, ,500 1, ,500 1, ,500 1, ,500 1, ,500 1, ,500 1, ,500 1, , , , , , ,
4 Heavy Duty Rectifier Transformer Specification parameter Specify the requirements for 1. Environmental condition and standards Applicable standard Electrical standard Mechanical standard IEC / IEEE DIN, EN ISO / ANSI (with metric screw system) Location Indoor / Outdoor / Offshore / Explosion-proof Environment High pollution / Salty and or mist / Tropical / Artic Altitude m 1,000 m Ambient s Yearly average ambient Monthly average ambient Yearly maximum ambient Yearly minimum ambient C 12 C C - C 35 C C -20 C Max. water inlet C - 4
5 Specify the requirements for 2. Electrical design Design criteria Type Cooling type Oil-filled 3-phase rectifier transformer with regulation (auto) transformer with built-in transducers OFAF Rated power MVA 76,368 / 4x 19,092 MVA Operating mode Continuous Rated frequency Hz 50 Hz Vector group Da0 Dy0d el / Dy0d1-7.5 el Rated voltage kv 30.0 kv / 4x0.75 kv Tapping range V 750 to 272 V No. of steps/pos. approx. 71/72 (67/68 effective + necessary number of taps/positions for voltage fluctuation) Rated current LV ka 4x ka Harmonics specified by Siemens Erlangen Short-circuit duration s 2 s Short-circuit power MVA max. 3,000 MVA Type of rectifier circuit 3-phase bridge or double star Only for double-star transformers: Transducers control range V 20 V Only for double-star transformers: Interphase reactor Rated voltage V 2x 160 V Rated current ka 15,0 ka per LV System Rated frequency Hz 150Hz Isolation level Highest voltage for equipment HV winding kv 36 kv LV windings kv 3 kv Rated power frequency HV winding kv 70 kv LV windings kv 10 kv 5
6 Specify the requirements for Rated lightning impulse HV winding kv 170 kv LV windings kv - Rated switching impulse HV system - LV system - 6
7 Converter Trasnformer for Variable speed drives Specification parameter Specify the requirements for 1. Environmental condition and standards Applicable standard Electrical standard Mechanical standard IEC / IEEE / CSA / GOST DIN, EN ISO / ANSI (with metric screw system) Location Indoor / Outdoor / Offshore / Explosion-proof Environment High pollution / Salty and or mist / Tropical / Artic Altitude m 1,000 m Ambient s Yearly average ambient Monthly average ambient Yearly maximum ambient Yearly minimum ambient C 20 C C 30 C C 40 C C -25 C Max. water inlet C - 7
8 Specify the requirements for 2. Electrical design Design criteria Type Cooling type Oil-immersed, 3-phase double-tier converter transformer with filter winding KFAF Rated power MVA / 2x 68 MVA / 50 Mvar Operating mode Continuous Rated frequency Hz 60 Hz ± 5% Vector group D d0 y11 y11 Rated voltage kv 132 kv / 2x 14.1 kv / 17.5 kv Tapping range % 2x (+/- 2.5) % No. of steps +/- 2 Harmonics specified by Siemens PD OM OGD Short-circuit duration s 2 s Short-circuit power MVA max. 500 MVA Isolation level Highest voltage for equipment HV winding kv 138 kv LV1/2 winding kv 15 kv LV winding kv 15 kv Rated power frequency HV winding kv 207 kv LV1/2 winding kv 34 kv LV winding kv 34 kv Rated lightning impulse HV winding kv 550 kv LV1/2 winding kv 110 kv LV winding kv 110 kv Rated switching impulse HV system - LV system - F system - 8
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