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1MVA 3 Phase Power Transformer

The 1 MVA 3‑Phase Power Transformer is a compact, oil‑filled unit designed to deliver reliable medium‑voltage power in commercial, light‑industrial, and rural distribution networks. Built to IEC 60076 and ANSI/IEEE standards, it steps down 11 kV (or customer‑specified primary up to 36 kV) to 415 V (or up to 690 V) with a Dyn11 connection for stable, grounded secondary output. Natural ONAN cooling supports continuous 1 MVA load, while optional ONAF fans boost capacity to 1.1 MVA under peak demands. A ±2×2.5 % off‑circuit tap changer allows fine voltage tuning, and a sealed conservator with silica‑gel breather maintains oil purity across –25 °C to +40 °C environments. With low noise, minimal footprint, and straightforward pad or skid mounting, it’s ideal where space, efficiency, and uptime are critical.

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Product Accessories

Off‑Circuit Tap Changer Handle: External adapter enabling ±5 % voltage adjustment in five positions.

Silica-Gel Breather & Conservator Tank: Maintains dryness and compensates oil thermal expansion.

Buchholz & Pressure Relays: Twin‑float gas detector plus overpressure trip for early fault response.

Oil & Winding Temperature Indicators: Dial gauges with dual alarm/trip contacts driving fan control.

Porcelain HV/LV Bushings: Oil‑filled, capacitance‑graded bushings rated to 36 kV/690 V.

Radiators & Optional Fans: Bolt‑on cooling panels; fans auto‑start at 65 °C oil temperature.

Oil Sampling & Drain Valves: Bottom‑mounted valves for safe oil testing without tank breach.

Grounding Lugs & Nameplate: Stainless‑steel earthing hardware and embossed data plate.

Marshalling Box: NEMA 3R panel with prewired CTs, relays, and control wiring.

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Product Specifications

Rated Power

1 MVA (ONAN) / 1.1 MVA (ONAF)

Primary Voltage

11 kV (custom up to 36 kV)

Secondary Voltage

415 V (custom up to 690 V)

Vector Group

Dyn11

Tap Changer

Off‑circuit, ±2×2.5 % (five positions)

Cooling Method

ONAN (standard), ONAF (optional)

Frequency

50/60 Hz

Impedance

4–6 % (customer‑defined)

No‑Load Loss

≤ 1 000 W

Load Loss

≤ 8 000 W

Product Applications

Economy is more affordable

Product Advantages

Space‑Saving Design

Compact core‑and‑coil assembly and pad/skid mounting minimize footprint in tight substations.

Fine Voltage Regulation

Five‑step tap changer ensures downstream equipment operates within ±2.5 % of nominal voltage.

Low Maintenance & High Reliability

IEC‑tested relays, sealed tank, and silica‑gel breather deliver years of trouble‑free operation with minimal servicing.

WellDone Power Transformer Plan Drawing

FAQ

What range of transformer products do you offer and which standards do they meet?

We manufacture a diverse array of transformers including Oil-Immersed Distribution Transformers, Dry Type Transformers, Power Transformers, Three Phase Pad Mounted Transformers, Single Phase Pad Mounted Transformers, Substation Transformers, and Pole Mounted Transformers. Our technical team, with nearly 20 years of industry experience, ensures that our designs comply with international standards such as ANSI, IEEE, DOE, CSA, AS, AZS, GOST, IEC, and more. Additionally, many of our products have obtained UL, cUL, and CSA certifications, affirming their safety and performance in global markets.
How do you ensure the quality and reliability of your transformers?

Our transformers are produced under a rigorous quality management system covering every stage from material selection to final testing. Each product comes with a minimum 24-month warranty, ensuring long-term safety and reliability. This commitment to quality has earned the trust of global customers and leading industry players.
What are your production lead times, customization options, and global market reach?

For standard models, our production lead time is typically 10 to 25 days, and we offer flexible OEM/ODM services for customized projects. We also tailor packaging solutions to meet specific customer requirements. Our transformers are exported worldwide—including North America, Europe, South America, Australia, Asia, and Africa—with successful partnerships involving renowned companies. For more details or personalized support, please contact us via email or WhatsApp.