Overview
The S□-M series uses mineral oil as the insulation system; its tank treatment meets the special outdoor demands of metallurgical and petrochemical plants and of humid, polluted regions.
Oil-Immersed Transformers
S□-M Oil-Immersed Power Transformer
Sealed mineral-oil distribution transformers, 30–2500 kVA at 10/10.5 kV — grain-oriented core with multi-step 45° mitred joints, corrugated tank breathing with the oil, maintenance-free with no oil change.
Factory-direct supply
Worldwide delivery & export documentation
12-month warranty · extended options
- Core of premium cold-rolled grain-oriented silicon steel, stacked with multi-step 45° fully mitred joints
- Low no-load and load losses in service
- Cylindrical winding structure with balanced ampere-turns — strong short-circuit withstand
- Elastic corrugated tank or panel radiators absorb oil volume change from heating and cooling
- Tank surface de-rusted, de-greased and phosphated before primer and topcoat — fit for metallurgy, petrochemica
- Maintenance-free: no insulating-oil replacement
At a glance
Built to perform, year after year
10·10.5 kV / 0.4 kV
HV / LV voltage
±2×2.5 %·±5 % / Dyn11·Yyn0
Tap range / vector group
4.0 / 4.5 / 5.0%
Short-circuit impedance
A closer look
Engineered around safety, efficiency and uptime
Product features
Core of premium cold-rolled grain-oriented silicon steel, stacked with multi-step 45° fully mitred joints
Low no-load and load losses in service
Cylindrical winding structure with balanced ampere-turns — strong short-circuit withstand
Elastic corrugated tank or panel radiators absorb oil volume change from heating and cooling
Tank surface de-rusted, de-greased and phosphated before primer and topcoat — fit for metallurgy, petrochemical and humid-polluted outdoor sites
Maintenance-free: no insulating-oil replacement
Designation
Three-phase · loss-level code · sealed type · rated capacity (kVA) · system nominal voltage (kV)
Technical specifications
Full specifications
Common data
HV / LV voltage
10·10.5 kV / 0.4 kV
Tap range / vector group
±2×2.5 %·±5 % / Dyn11·Yyn0
Short-circuit impedance
4.0 / 4.5 / 5.0 %
Loss data — typical ratings (S20-M / S22-M, W)
30 kVA — no-load / load
70·65 / 505·455
100 kVA — no-load / load
135·120 / 1265·1140
315 kVA — no-load / load
305·270 / 3065·2760
630 kVA — no-load / load
510·460 / 4960·4460
1250 kVA — no-load / load
870·780 / 9600·8640
2500 kVA — no-load / load
1440·1280 / 16960·15270
Note
≤500kVA 斜线前 Dyn11 / 后 Yyn0;全系 30–2500kVA
Specifications are representative and may vary by configuration and region. Final figures are confirmed on the project datasheet.
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