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.
- 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
A cleaner, more reliable approach to MV switching
The HP-ELS series replaces SF₆ with environmentally friendly insulating media while keeping the proven safety and performance utilities expect from gas-insulated switchgear.
Product Overview
The S□-M series oil-immersed power transformer uses mineral oil as its insulation system; its oil-tank processing meets special outdoor requirements for metallurgical and petrochemical systems and for humid, polluted areas. It complies with the GB/T 1094 series, GB/T 25446-2010 and GB 20052-2024.
Technical specifications
Headline ratings at a glance, followed by the full technical data sheet. Exact values are confirmed per project configuration.
| Parameter | Value |
|---|---|
| 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 % |
| 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 | Dyn11 / Yyn0 by rating · full range 30–2500 kVA |
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