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50MVA 3 Phase Power Transformer

Engineered for high-demand transmission and industrial applications, the 50 MVA 3-Phase Power Transformer offers robust performance under the toughest conditions. Built to IEEE C57.12.00 and C57.12.90 standards, it steps down 34.5 kV Delta to 13.8 kV Wye with a Dyn1 vector group. Its copper windings and mineral oil type II deliver exceptional efficiency and thermal stability, with natural ONAN cooling managing a 65 °C temperature rise. A ±10 % on-load tap changer allows precise voltage regulation without interrupting service. Porcelain bushings rated 150/95 kV BIL and a weather-sealed enclosure ensure long-term reliability in outdoor substations and industrial sites.

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Product Accessories

On-Load Tap Changer (OLTC): Motorized, ±10 % range with position indicator for live voltage adjustment.

Buchholz & Pressure Relays: Gas-and-oil surge detection with separate alarm/trip contacts.

Oil & Winding Temperature Indicators: Dial-type gauges with two alarm and two trip contacts for fan control and protection.

Conservator & Silica-Gel Breather: Maintains oil volume and dryness, with magnetic level gauge.

Porcelain HV/LV Bushings: Side-mounted, 4-hole NEMA pads for bottom cable entry.

Cooling Radiators & Fans: Hot-dip galvanized panels with auto-start fans at 55 °C oil temperature.

Drain & Sampling Valves: Easy-access bottom valves for oil tests without tank opening.

Grounding Lugs & Nameplate: Stainless-steel earthing hardware and engraved data plate.

Marshalling Box: NEMA 3R enclosure housing CTs, relays, and control wiring.

Surge Arresters: External lightning protection for both HV and LV sides.

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Product Specifications

Rated Power

50 MVA

Primary Voltage

34.5 kV

Secondary Voltage

13.8 kV

Vector Group

Dyn1

Tap Changer Range

±10 %

Cooling Method

ONAN

No-Load Loss

≤ 0.15 % of rated power

Load Loss

≤ 0.85 % of rated power

BIL Rating (HV/LV)

150 kV / 95 kV

Oil Volume

19 150 kg

Product Applications

Economy is more affordable

Product Advantages

Precision Voltage Control

±10 % OLTC under load maintains output within tight tolerances, protecting sensitive equipment.

Superior Thermal Management

ONAN cooling with temperature-triggered fans ensures efficient heat dissipation and extended transformer life.

Durable Outdoor Reliability

Porcelain bushings, sealed conservator, and robust relays provide decades of low-maintenance operation in harsh environments.

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.