| Standard design | Possible adaptation | |
| Manufacturing standards | IEC 60076-11, EN 50588, EN 50629 | GOST-R, BS, IEEE |
| Efficiency (losses level) | Eco-Design | Every reduced losses required by customers |
| Class tests | E4 , C4 , F1 | |
| HV/LV coils | HV encapsulated in cast resin/LV impregnated | HV and LV encapsulated in cast resin |
| Installations | Indoor use: | Outdoor use with properly designed enclosure: |
| * IPOO (without enclosure)/IP21,IP31 (with enclosure) | * From IP35 up to IP44 (with enclosure) | |
| ㆍUp to C5-Marine, Medium durability | ||
| (in compliance with ISO 12944-6) | ||
| Winding material | According to manufacturer optimization (Cu or Al) | Cu/Cu |
| Phases | Three-phase | Single-phase |
| Cooling system | Standard: | AFWF (air forced water forced) |
| ㆍ AN (natural air) | ||
| Option: | ||
| ㆍ AF (air forced) | ||
| ㆍ 40% performance reserves | ||
| Maximum T*C/altitude | 40C at any time/1000 m | Up to 65*C/Above 1000 m |
| Thermal class insulation | According to IEC 60085, Class F | |
| Temperature rise | 100 K | 80 K (for 40C) |
| Temperature rise adapted to maximum T”C | ||
| Temperature Rise < 100K upon request | ||
| Rated frequency | 50 Hz or 60 Hz | |
| Rated power | Up to 3150 kVA | Up to 15 MVA |
| Impedance voltage Uk | From 4 to 6% | ㆍ Lower than 4% |
| ㆍHigher than 6% – Up to 11% | ||
| Vector groups | Dyn, YNd | All others according to IEC |
| Rated HV insulation | Up to 36 kV (IEC) | Up to 40.5 kV (GOST-R) |
| HV tapping | Off-circuit tapping links: 3 or 5 positions, 2.5% | Off-circuit tapping links: |
| up to 9 positions, +/- 2.5% or higher | ||
| On Load Tap Changing (OLTC) | ||
| HV terminals | Standard HV connections | HV/MV plug-in or porcelain bushings through dedicated |
| Rated LV (MV) insulation | cable boxes (IEC, BS or NEMA compliant) | |
| LV terminals | 1.1 kV | Up to 7.2 kV |
| ㆍ Standard LV connections | LV cable ducting interface (Canalis) | |
| ㆍ Top or bottom entry (on request) | ” Side entry through dedicated cable boxes | |
| (IEC, BS or NEMA compliant) | ||
| Thermal protection | ㆍ AN cooling system: | |
| 6 PTC sensors (or 3 PT100) + Thermal Relay | ||
| ㆍ AF cooling system: | ||
| 6 PT100 sensors (or 9 PTC) + Thermal Relay |
