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150KV 150MVA 3 Phase Power Transformer

The 150 kV 150 MVA 3-Phase Power Transformer is an advanced, oil-immersed unit engineered for major transmission corridors and large utility substations. It meets IEC 60076 and ANSI/IEEE C57.12 standards for performance and safety. Its conservator-type tank, fitted with a self-regenerating silica-gel breather, maintains optimal oil quality across –20 °C to +100 °C ambient variations. Continuous natural cooling (ONAN) supports 90 MVA operation, while staged forced-air cooling (ONAF1/ONAF2) elevates capacity to 120 MVA and 150 MVA respectively, all at a controlled 65 °C temperature rise. A 17-step on-load tap changer provides ±8 × 1.25 % voltage regulation under load, ensuring downstream stability. The IP55-rated enclosure and high-integrity porcelain bushings (650 kV/150 kV BIL) deliver robust protection in demanding outdoor settings.

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Product Accessories

17-Step On-Load Tap Changer (OLTC): Motor-driven unit with position indicator for fine ±8 × 1.25 % regulation under full load

Conservator & Breather Assembly: Magnetic oil level gauges and silica-gel desiccant prevent moisture ingress and maintain oil volume

Twin-Float Buchholz Relay: Dual-contact gas surge detection for early fault warning and tripping

Pressure-Vacuum Gauge: Monitors internal tank pressure and vacuum, triggering alerts on deviation

Oil & Winding Thermometers: Dial-type indicators with adjustable alarms for main tank and OLTC

Detachable Radiators & Fans: Hot-dip galvanized radiators and ONAF fans for staged forced-air cooling

Overpressure Relief Valve: Visual semaphore and electrical trip contacts for rapid pressure release

HV/LV Porcelain Bushings: Capacitance-graded, oil-filled bushings rated for 150 kV/33 kV service

316 Stainless-Steel Nameplates & Grounding Lugs: Durable identification and secure earthing hardware

NEMA 3R Marshalling Box: Weatherproof stainless-steel enclosure organizing all control and signal wiring

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Product Specifications

Rated Power

150 MVA (second-stage ONAF)

Primary Voltage

150 kV

Secondary Voltage

33 kV

Cooling Method

ONAN / ONAF (2-stage)

Tap Changer

17-step OLTC, ±8 × 1.25 %

Efficiency

≥ 99 % at full load

Impedance

10 % at rated MVA

Top-Oil Temperature Rise

65 °C

BIL (HV/LV)

650 kV / 150 kV

Ingress Protection

IP55

Product Applications

Economy is more affordable

Step down 150 kV feeders to distribution levels with high efficiency and low losses.

Utility Transmission Substations
Supply continuous, high-capacity power to steel mills, refineries, and mining operations.

Heavy Industrial Facilities
Interface 150 kV wind and solar farms, stabilizing voltage amid variable generation.

Renewable Energy Integration
Power data centers, airports, and hospitals requiring unwavering reliability.

Critical Infrastructure

Product Advantages

Scalable Cooling Modes

Dual-stage cooling (ONAF1/ONAF2) ramps capacity from 90 MVA (ONAN) to 150 MVA, accommodating peak loads without thermal stress.

Fine Voltage Control

High-resolution OLTC ensures output remains within ±2 % of nominal under dynamic conditions.

Environmental Robustness

IP55 enclosure, silica-gel breather, and galvanized components withstand dust, moisture, and corrosive atmospheres for long service life.

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.

150KV 3 Phase Power Transformer 150MVA 3 Phase Power Transformer 150KV 150MVA 3 Phase Power Transformer

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