Low-loss, fully sealed, built for decades of service
Good economic performance: no-load current drops 60–80% on average and no-load loss is reduced 25–35% on average.
Long service life: the fully sealed oil tank (bolted or welded tank edge) keeps the pressurized oil out of contact with air. Improved tank-seal design and process give proven, high operational reliability.
Small footprint: a corrugated-plate radiator expands and contracts with oil temperature, replacing the oil conservator, for a compact unit with a clean appearance.
Oil-Immersed Distribution Transformer
10 kV and 35 kV classes, off-circuit or on-load voltage regulation, energy-efficiency rated.
| 10 kV class | 30–2500 kVA · HV 10 kV (±2×2.5% tap) · LV 0.4 kV · Dyn11 / Yyn0 · impedance 4.0–4.5% |
|---|---|
| 10 kV on-load (OLTC) | 200–2500 kVA · on-load tap ±4×2.5% |
| 35 kV class | 2500–31500 kVA · LV 3.15 / 6.3 / 10.5 kV · Yd11 / YNd11 · impedance 6.5–8% |
| Standards | IEC / GB; energy-efficiency rated |
Indicative ranges from the manufacturer's selection guide. Final ratings, taps, impedance and accessories are configured to your project specification.
Sealed Amorphous-Alloy Transformer
A fully oil-filled, sealed transformer built on an amorphous-alloy core (iron, nickel, cobalt, boron, carbon) — an isotropic soft-magnetic material. Model series S(B)H15(21–25)-M.
| Low loss | No-load loss reduced 60–80% vs silicon steel, cutting grid standby energy use |
|---|---|
| High energy efficiency | Lower losses reduce generation demand and CO₂ emissions |
| Temperature stability | Stable magnetic properties across a wide temperature range |
Engineered to last in the field
Low loss & high efficiency
No-load loss down 25–35%, and up to 60–80% with an amorphous-alloy core.
Fully sealed, long life
Pressurized oil never contacts air, extending service life and reliability.
Corrugated-tank footprint
Corrugated radiator replaces the conservator for a compact, clean unit.
Amorphous-alloy option
Isotropic soft-magnetic core for the lowest standby losses.
Energy-saving 3-D core
Triangular wound-core option balances the magnetic circuit and cuts noise.
Low noise
Balanced flux paths reduce operating noise for sensitive sites.
Where these transformers fit
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Send your kVA, voltages, taps and accessory schedule — we'll return an engineered quote with drawings and a DOE/CSA efficiency statement.