8 MVA 33kV Auto Power Transformer | High-Efficiency Medium Voltage Solution
ZTelec 8 MVA 33kV Auto Power Transformer is a high-performance three-phase electrical device designed for voltage regulation and power distribution in medium-voltage systems. Unlike traditional two-winding transformers, this autotransformer uses a single integrated winding to efficiently transfer energy, reducing copper loss and improving voltage stability. Fully compliant with IEC 60076 and ANSI C57 standards, it has been widely deployed in more than 50 countries for reliable grid and industrial applications.
Key Application Fields
Urban Distribution Networks: Reduces 33kV grid voltage to 6.6kV or 0.4kV for commercial and residential use. Commonly used in power systems across South Africa, the Middle East, and Southeast Asia.
Industrial and Mining Operations: Supplies stable power to heavy-duty mining machinery and manufacturing equipment. Proven durability under high-load and harsh working environments in countries such as Zimbabwe and Sudan.
Renewable Energy Integration: Seamlessly connects solar and wind power farms to 33kV grids, providing efficient voltage conversion for 50/60 Hz renewable systems.
Large-Scale Commercial Facilities: Ensures stable, low-noise power supply for airports, railway stations, data centers, and shopping malls, optimizing energy reliability and safety.
Unmatched Advantages of ZTelec 8 MVA 33kV Autotransformer
Energy Efficiency
Utilizes low-loss core material with no-load losses of 7.87 kW and load losses of 40.6 kW, achieving up to 20% lower energy consumption compared to standard transformers.
Compact and Cost-Effective Design
Adopts a shared winding structure, reducing copper and core material usage by 30%. The compact design makes it ideal for space-constrained substations and mobile power units.
Enhanced Reliability and Longevity
Equipped with fully sealed corrugated tanks to prevent oil oxidation and moisture ingress, extending operational lifespan to over 25 years with minimal maintenance requirements.
Voltage Flexibility and Smart Regulation
Features an On-Load Tap Changer (OLTC) for ±2×2.5% voltage adjustment, allowing smooth adaptation to grid voltage fluctuations and improving power quality stability.
Certified Global Compliance
Meets international certifications including KEMA, EAC, and ISO 9001, ensuring full compliance for installation across Africa, Asia, Europe, and the Middle East.
8 MVA 33/33kV Transformer Testing and Quality Assurance
Each transformer undergoes routine, type, and special tests including temperature rise, short-circuit withstand, and impulse tests to guarantee performance consistency and safety before shipment.
Technical Overview
The following table provides reference technical data for the 8 MVA 33kV autotransformer. Custom voltage ratios and tap ranges can be tailored to specific project requirements.
| Parameter | Value |
|---|---|
| Rated Capacity | 8000 KVA (8 MVA) |
| Primary Voltage | 33 KV |
| Secondary Voltage | 6.6 KV / 0.4 KV |
| Cooling Method | ONAN (Oil Natural Air Natural) |
| Impedance | 8% |
| Vector Group | Dyn11 / YNd11 |
| Core Material | CRGO Silicon Steel |
| Winding Material | Copper/Aluminum |
| No-Load Loss | 7.0–7.87 kW |
| Load Loss (at 75°C) | 40.6–60 kW |
| Frequency | 50/60 Hz |
| Protection Features | Pressure Release Valve, Oil Level Gauge |
Why Choose ZTelec Auto Power Transformers
With over 60 years of expertise in transformer design and manufacturing, ZTelec Group delivers dependable power solutions for substations, renewable projects, and industrial power systems worldwide. The 8 MVA 33kV Auto Transformer combines advanced insulation, efficient magnetic design, and smart voltage control — setting a benchmark for reliability and performance in medium-voltage networks.
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