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200MVA 3 Phase Power Transformer

The 200 MVA 3‑Phase Power Transformer is a heavy‑duty, oil‑filled unit engineered for outdoor transmission and substation applications. Built to DSTU EN 60076‑1 (equivalent to IEC 60076) and ANSI/IEEE standards, it steps down 220 kV to 18 kV with a Dyn11 vector group. Its robust OFAF (Oil Forced Air Forced) cooling maintains a 65 °C oil—and winding—rise under continuous 200 MVA loads, and its on‑load tap changer (±2 × 2.5 %) ensures precise voltage regulation without service interruption. Designed for a 30‑year service life, this transformer withstands full‑wave lightning impulses up to 750 kV, 2‑second short circuits at 11 % impedance, and maintains noise below 85 dB. Modular rail‑mounted transport and galvanized control cabinets simplify installation in utility grids, data centers, renewable farms, and industrial plants.

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Product Accessories

On‑Load Tap Changer (NLTC)
Motor‑driven, ±2×2.5 % range with remote position indicator for live voltage adjustment.

Buchholz & Pressure‑Vacuum Relays
Twin‑float gas/oil surge detection and vacuum gauge with alarm/trip contacts.

Oil & Winding Temperature Devices
PT100 sensors and dial gauges with dual alarm/trip contacts for automatic fan control and protection.

Galvanized Control Cabinets
NEMA 3R enclosures with lighting, 220 V outlets, thermostat‑controlled heaters, and SCADA interface.

Forced‑Air Radiators & Fans
Hot‑dip galvanized panels and auto‑start fans to boost cooling capacity under overload.

Porcelain HV/LV Bushings
Side‑mounted 4‑hole NEMA pads for bottom cable entry—rated 750 kV/125 kV BIL.

Pressure Relief Device
Visual semaphore and electrical trip contacts for overpressure protection.

Drain & Sampling Valves
Bottom‑mounted, captive‑cap design for safe oil testing.

Lifting & Transport Hardware
Integrated rail shoes, ribbed rollers, and eyebolts for site movement and skid mounting.

Nameplate & Wiring Diagrams
316 stainless‑steel data plate and laminated schematics for quick reference.

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Product Specifications

Rated Power

200 MVA

Primary Voltage

220 kV (242 kV max operating)

Secondary Voltage

18 kV (19.8 kV max operating)

Vector Group

Dyn11

Tap Changer

±2 × 2.5 % OLTC on HV side

Cooling Method

OFAF

Impedance

11 % at base rating

Lightning Impulse Withstand

HV: 750 kV full‐wave; LV: 125 kV

Short‐Circuit Withstand

2 s at 2× rated current (per IEC 60076‑5)

Noise Level

≤ 85 dB at 2 m

Product Applications

Economy is more affordable

Step‑down and regulation for regional grid interties and load centers.

High‑Voltage Transmission Substations
Interfaces large battery arrays with the transmission network for grid stabilization.

Battery Energy Storage Systems (BESS)
Supplies stable medium‑voltage power to critical manufacturing and IT loads.

Industrial Plants & Data Centers
Connects wind farms and solar parks to the transmission grid with precise voltage control.

Renewable Energy Integration

Product Advantages

Exceptional Thermal Performance

OFAF cooling plus automatic fan control keeps oil and winding temperatures within safe limits even under overload.

Robust Fault Withstand

Designed to endure 2‑second short circuits and high impulse voltages, safeguarding plant reliability.

Long‑Term Durability

Engineered for a 30‑year service life with high‑quality insulating oil, galvanized cabinets, and comprehensive protective relays.

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.