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66KV 3 Phase Power Transformer

Our 66KV 3 Phase Power Transformer is an advanced oil-immersed solution engineered for robust high-voltage performance and reliable grid integration. Meticulously designed to adhere to international standards—including IEEE, IEC, and CSA—this transformer features a cutting-edge insulation system and precision tap adjustment to optimize voltage regulation. With a versatile connection configuration (including YNd and Dyn options) and an expansion vessel for thermal stability, it delivers exceptional performance in demanding outdoor substations, renewable energy installations, and industrial power distribution networks. Ideal for projects where reliability, efficiency, and precise load management are paramount, this transformer is built to ensure uninterrupted power delivery and long service life.

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Product Accessories

High Voltage Bushing Assembly: Engineered for secure, insulated connections to high-voltage cables.

Low Voltage Termination Kit: Includes robust connectors and terminal blocks designed for stable low-voltage interfacing.

Tap Changer Module: Off-circuit tap changer for fine-tuning output voltage under varying load conditions.

Oil Monitoring Components: Integrated oil level indicator and temperature sensor for real-time performance tracking.

Pressure Relief System: High-precision relief valves with alarm contacts to ensure safe operating pressures.

Radiator Pack: Custom-designed radiators with isolation valves and drain fittings for efficient thermal management.

Control and Measurement Panel: Terminal box equipped for control circuits, CT installations, and surge protection devices.

Protective Grounding Kit: Includes stainless steel earth lugs, grounding straps, and a dedicated earth terminal assembly.

Maintenance Access Features: Lifting lugs, jacking points, and access panels for streamlined service and inspections.

Certification & Identification Plate: Durable nameplate featuring key transformer data and compliance markings.

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Product Specifications

Rated Power

Options from 12.5 MVA up to 15 MVA

Primary Voltage

66KV (3 phase)

Secondary Voltage

Configurable to 33KV, 13.8KV, or 11KV, among other options

Frequency

50 Hz

Basic Insulation Level (BIL)

Up to 350KV on the high-voltage side

Tapping Range

±8×1.25% adjustments for precise voltage control

Cooling Method

ONAN with optional ONAF enhancements for optimal heat dissipation

Fluid Type

Mineral oil with an expansion vessel for improved thermal expansion management

Tap Positions

Equipped with 12 taps plus nominal setting for flexibility

Connection Options

Multiple configurations (YNd11, Dyn11, YNd1, Dyn1) to suit varied grid demands

Product Applications

Economy is more affordable

Perfect for upgrading urban and rural substations with reliable voltage step-down and surge protection tailored for heavy-duty grid distribution.

Substation Modernization
Optimized for solar and wind farm installations where precise voltage management is essential for inverter compatibility and efficient energy conversion.

Renewable Energy Integration
Designed to meet the high-load demands of manufacturing plants, chemical processing facilities, and heavy industrial sites that require stable, high-quality power.

Industrial Power Distribution
Ideal for large-scale projects such as data centers, mining operations, and transportation hubs where continuous, reliable power is crucial to maintain operations and prevent downtime.

Critical Infrastructure

Product Advantages

Enhanced Efficiency & Reliability

Engineered for minimal energy loss and superior thermal management, ensuring long-term operational stability even under fluctuating load conditions.

Versatile & Customizable

Multiple voltage and connection configurations allow seamless adaptation to diverse network requirements and project-specific demands.

Robust Safety & Compliance

Built with advanced insulation, precise tap adjustment, and integrated protective accessories, it meets rigorous international standards, offering safe and dependable performance in critical applications.

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.