| Rated voltage | 66/69KV |
|---|---|
| Rated capacity | 6300KVA-63MVA |
| Application scenarios | Substations, photovoltaic power plants, steel mills, airports, ports, etc. |
| Certifications & Standards | EC、GB、ANSI/IEEE、NEMA |
In today’s global grid environment, reliable and efficient voltage transformation is critical. Our 66 kV Oil‑Immersed Power Transformer from ZTelec Electric is specifically engineered for high‑voltage transmission, industrial substations, and demanding utility applications. With a compact design, excellent weather resistance and cost-effectiveness, it is ideal for power systems, industrial/mining enterprises, transport, telecom, and research institutions.
Featuring advanced core and coil technologies — including grain‑oriented silicon steel and high‑quality copper winding — this transformer delivers low losses, high mechanical strength and reliable long‑term performance.
High efficiency & low losses: Optimised core and winding design reduce no‑load losses and stray losses.
Robust construction: Steel oil tank with corrosion resistant treatment, choosing from corrugated, expanding radiator types.
Excellent insulation and dielectric strength: Suitable for harsh environments and built for durability.
Versatile applications: Suitable for power plants, industrial substations, grid step‑up/step‑down, transportation and telecom sectors.
Customisable to standards: Designed for voltage levels up to 66 kV, with various capacity options to meet customer requirements.
| Rated Capacity (kVA) | Typical Voltage Ratio (kV) | Vector Group | Impedance Voltage (%) | Reference Size L×W×H (mm) | No-Load Loss (W) | Load Loss (W) |
|---|---|---|---|---|---|---|
| (SF11) 6,300/66 |
|
9 | 4800×3900×4000 | 7,300 | 34,200 | |
| (SF11)8,000/66 | – | 22 | 4900×4100×4200 | 8,900 | 40,500 | |
| (SF11)10,000/66 | – | 25 | 5000×4300×4400 | 10,500 | 47,800 | |
| (SF11)12,500/66 | – | 28 | 5100×4400×4500 | 12,400 | 56,800 | |
| (SF11)16,000/66 | – | 30 | 5200×4600×4600 | 15,000 | 69,800 | |
| (SF11)20,000/66 | HV: 66/69 KV ±2×2.5% LV: 3.15, 3.3, 6.3, 6.6, 10.5 kV | YNd11 | 34 | 5300×4700×4800 | 17,600 | 84,600 |
| (SF11)25,000/66 | – | 41 | 5500×4700×5000 | 20,800 | 100,000 | |
| (SF11)31,500/66 | – | 46 | 5600×4800×5200 | 24,600 | 120,000 | |
| (SF11)40,000/66 | – | 57 | 5800×5000×5300 | 29,400 | 141,000 | |
| (SF11)50,000/66 | – | 67 | 6000×5300×5500 | 35,200 | 167,000 | |
| (SF11)63,000/66 | – | 73 | 6200×5600×5700 | 41,600 | 198,000 |
| Rated Capacity (kVA) | Typical Voltage Ratio (kV) | Vector Group | Impedance Voltage (%) | Reference Size L×W×H (mm) | No-Load Loss (W) | Load Loss (W) |
|---|---|---|---|---|---|---|
| (SFZ11)6,300/66 | 9–11 | 5600×3800×4000 | 8,000 | 34,200 | ||
| (SFZ11)8,000/66 | – | – | 22 | 5700×4000×4200 | 9,600 | 40,500 |
| (SFZ11)10,000/66 | – | – | 27 | 5800×4200×4400 | 11,300 | 47,800 |
| (SFZ11)12,500/66 | – | – | 30 | 5900×4300×4500 | 13,400 | 56,800 |
| (SFZ11)16,000/66 | HV: 66/69 KV ±2×2.5% → LV: 3.15, 3.3, 6.3, 6.6, 10.5 kV | YNd11 | 33 | 6000×4400×4600 | 16,100 | 69,800 |
| (SFZ11)20,000/66 | – | – | 36 | 6100×4500×4800 | 19,200 | 84,600 |
| (SFZ11)25,000/66 | – | – | 43 | 6500×4500×5000 | 22,700 | 100,000 |
| (SFZ11)31,500/66 | – | – | 49 | 6600×4600×5200 | 26,900 | 120,000 |
| (SFZ11)40,000/66 | – | – | 59 | 6800×4800×5300 | 32,200 | 141,000 |
| (SFZ11)50,000/66 | – | – | 69 | 7000×5000×5500 | 38,000 | 167,000 |
| (SFZ11)63,000/66 | – | – | 75 | 7400×5300×5700 | 44,900 | 198,000 |
Transmission substations and grid step‑up/step‑down for 66 kV systems.
Industrial plants and mining operations requiring reliable high‑voltage transformers.
Utility and public infrastructure installations such as rail, telecom and transport systems.
Research, education and test applications in power system labs.
Global industry‑proven design: Backed by decades of service in power & utility sectors.
Flexible specification options: Wide range of capacities from 6,300 kVA to 63,000 kVA.
Customisable: Adaptable to site conditions (altitude, temperature, tap‑changer options).
Strong technical support: Full documentation, test reports and on‑site commissioning assistance available.
When placing an order, please specify the rated capacity, voltage ratio (HV & LV), vector group, and whether an OLTC (on‑load tap‑changer) or NLTC (off‑circuit tap‑changer) is required.
For special site conditions exceeding standard service limits (altitude above 1,000 m, ambient temperature outside –45 °C to +40 °C), please inform us for custom engineering.
Our team can support site‑specific drawings, transport logistics and commissioning support.
05-05 2025
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