Service condition | |
Normal Condition
Ambient temperature Indoor -5°C to +40°C Outdoor -10°C to +40°C Humidity 90% Altitude ≤1000m Pollution Level I-Light Level II-Medium Earthquake UBC Zone 3
| Special Condition
Ambient temperature Indoor -15°C to +40°C, -25°C to +40°C Outdoor -10°C to +50°C, -25°C to +40°C -40°C to +40°C Humidity 95%, 98% Altitude ≤2000m, ≤3000m, ≤4000m Pollution Level III-Heavy Level IV-Very Heavy Earthquake UBC Zone 4
K-factor 3, 5, 7, 9, 11, 13, 15, 17
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Standard code IEC 60076-11 Power transformers-Part 11: Dry-type transformers IEEE C57.12.01 General Requirements for Dry-Type Distribution and Power Transformers Including Those with Solid-Cast and/or Resin Encapsulated Windings
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Ratings | |
IEC
Rated Frequency 50Hz, 60Hz Rated Voltage 3.6 kV – 7.2 kV – 12 kV – 17.5 kV – 24 kV – 36 kV Rated Insulation Level 20kV – 40kV – 60kV – 75kV – 95kV – 125kV – 145kV – 170kV Rated KVA 30kVA – 50kVA – 80kVA – 100kVA – 125kVA – 160kVA – 200kVA – 250kVA – 315kVA – 400kVA – 500kVA – 630kVA – 800kVA – 1000kVA – 1250kVA – 1600kVA – 2000kVA – 2500kVA – 3150kVA
| IEEE
Rated Frequency 60Hz Rated Voltage 2.5kV – 5.0kV – 8.7kV – 15.0kV – 25kV – 34.5kV Rated Basic Impulse level 30kV – 45kV – 60kV – 75kV- 95kV – 110kV – 150kV – 200kV Rated KVA Single-phase transformer: 5kVA – 10kVA – 15kVA – 25kVA – 37.5kVA – 50kVA – 75kVA – 100kVA – 167kVA – 250kVA – 333kVA Three-phase transformer: 15kVA – 30kVA – 45kVA – 75kVA – 112.5kVA – 150kVA – 225kVA – 300kVA – 500kVA – 750kVA – 1000kVA – 1500kVA – 2000kVA – 2500kVA – 3750kVA |
Features | |
Design --Guarantee of accurate temperature rise in windings; in case of enclosure IP/NEMA there is no de-rating --Low working temperatures down to -25℃ --Possibility to include any kind of accessories --Insulation class F,H(option)
| Technology 1.Aluminum or copper foil disk in high voltage winding 2. Aluminum or copper foil full width in low voltage winding 3. Casting under vacuum 4. Low partial discharge values <10 pC 5. Smooth surface 6. Self extinguishing 7. Dust resistance thanks to sealed coils (option) 8. Silicon free (option) 9.Low induction level and step lap configuration granting lower noise level 10. High impulse voltage withstand 11 .High short circuit withstand (radial and axial)
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Design options | |
--Reduced loss transformers --Copper windings --Low voltage transformers --Class H transformers --Reduced temperature rise --Multiple primary voltage --Multiple secondary windings --Multi winding transformers (2, 3, 4 or 5 on the same core) --Encapsulated low voltage windings --Sealed or casted low voltage winding --Impregnated high voltage windings
| --Different location of high and low voltage connection terminals: top and bottom, both on the same side --Special connection groups --Autotransformer --Variable speed drives (VSD), rectifiers and excitation transformers for 6, 12, 18 and 24 pulses --Different coupling factors from 0.15 up to 0.9 --Earthing transformers --Seismic and vibration reinforcement system --Outdoor operation
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