35kV Oil-Immersed Transformer
Product Overview
Core Specs: Rated voltage 10–35kV; capacity 30–3150kVA (technical data covers up to 31500kVA); tap changers (no-load/on-load); cooling methods (ONAN/ONAF).
Working Principle: Core-coil assembly is immersed in insulating oil within a steel tank. Oil acts as cooling/insulating medium, circulating via convection.
Temperature Requirement: Operating temp <85°C (to avoid oil deterioration); recommended daily average ~30°C.
Advantage
Cost-effective: Up to 50% cheaper than dry-type transformers of the same capacity.
Superior cooling & voltage capacity: Oil is a better cooling medium; no voltage limit (dry-type <35kV).
Versatile: Functions as both power and distribution transformers.
Eco-friendly & compact: Easier to recycle than dry-type; ideal for outdoor installation.
Technical Parameters (S11 Series: Low-Loss, Non-Excitation Regulation)
| Rated Capacity (kVA) | Voltage Combination | Vector Group | No-Load Loss (W) | Load Loss (W, 75℃) | No-Load Current (%) | Short-Circuit Impedance (%) |
| 630 | HV: 35kV (±5%); LV: 3.15/6.3/10.5kV | Yd11 | 830 | 7870 | 1.10 | 6.5 |
| 800 | Same as above | Yd11 | 980 | 9410 | 1.00 | 6.5 |
| 1000 | Same as above | Yd11 | 1150 | 11540 | 1.00 | 6.5 |
| 1250 | Same as above | Yd11 | 1410 | 13940 | 0.90 | 6.5 |
| 1600 | Same as above | Yd11 | 1700 | 16670 | 0.80 | 6.5 |
| 2000 | Same as above | Yd11 | 2180 | 18380 | 0.70 | 6.5 |
| 2500 | Same as above | Yd11 | 2560 | 19670 | 0.60 | 6.5 |
| 3150 | HV: 35~38.5kV (±5%); LV: 3.15/6.3/10.5kV | Yd11 | 3040 | 23090 | 0.56 | 7.0 |
| 4000 | Same as above | Yd11 | 3620 | 27360 | 0.56 | 7.0 |
| 5000 | Same as above | Yd11 | 4320 | 31380 | 0.48 | 7.0 |
| 6300 | Same as above | Yd11 | 5250 | 35060 | 0.48 | 7.5 |
| 8000 | HV: 35~38.5kV (±2×2.5%); LV: 3.15/3.3/6.3/6.6/10.5/11kV | Ynd11 | 7200 | 38480 | 0.42 | 7.5 |
| 10000 | Same as above | Ynd11 | 8700 | 45320 | 0.42 | 7.5 |
| 12500 | Same as above | Ynd11 | 10080 | 53870 | 0.40 | 8.0 |
| 16000 | Same as above | Ynd11 | 12160 | 65840 | 0.40 | 8.0 |
| 20000 | Same as above | Ynd11 | 14400 | 79520 | 0.40 | 8.0 |
| 25000 | Same as above | Ynd11 | 17020 | 94050 | 0.32 | 8.0 |
| 31500 | Same as above | Ynd11 | 20220 | 112860 | 0.32 | 8.0 |
Application
Suitable for well-ventilated indoor/outdoor settings, urban/rural power transmission/distribution networks. Special models apply to harsh environments (seaside, chemical plants, coal mines) and key sectors like petrochemical industry, power systems, and transportation.
