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| Type | Three-Phase Two-Winding Oil-Immersed Distribution Transformer with Off-Circuit or On-Load Tap Changing | Model | S13 / S14 / S15 Series |
| Params | Rated capacity: 30–3,150 kVA (10 kV class) / 3,150–31,500 kVA (35 kV class) HV: 6 / 10 / 10.5 / 11 / 35 kV LV: 0.4 / 0.69 / 3.15 / 6.3 / 10.5 kV Frequency: 50/60 Hz Vector group: Dyn11 / Yyn0 Impedance voltage: 4 / 4.5 / 6 / 6.5 / 7 / 8 / 10% Tap changing: off-circuit tap changing (±2×2.5%) / on-load tap changing Cooling: ONAN Efficiency: Grade 1 / Grade 2 (GB 20052) | Material | Core: high-permeability grain-oriented silicon steel with fully mitered, hole-free clamping structure Windings: oxygen-free copper conductors / copper foil with paper insulation Tank: corrugated tank (≤1,600 kVA) / tubular radiators (≥2,000 kVA) Insulating oil: No. 25 mineral oil / No. 45 low-temperature oil / FR3 natural ester oil Sealing: fully sealed construction; bladder or conservator optional HV bushings: porcelain or composite silicone-rubber bushings LV bushings: copper busbar or porcelain bushings |
| Applicable Industry | Urban and rural distribution-grid construction and upgrades Industrial plant auxiliary power Commercial buildings and residential communities Infrastructure including hospitals, schools and municipal utilities Transformer packages for renewable-energy substations | ||
1. Average no-load current reduced by 60–80% and average no-load losses reduced by 25–35% 2. Fully sealed tank prevents transformer oil from contacting air and extends service life 3. Corrugated radiator tank replaces the conservator, providing a clean appearance and smaller footprint 4. National energy-saving product and CQC product certified 5. S13/S14/S15 efficiency options meet different regional requirements 6. 35 kV class available up to 31,500 kVA for medium and large industrial loads 7. Natural ester insulating oil available for high-flash-point, biodegradable and green-building applications 8. Complete routine and type testing before shipment

Oil-Immersed Distribution Transformer

Oil-Immersed Distribution Transformer

Oil-Immersed Distribution Transformer
