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220KV 3 Phase Oil-immersed Electric Power Transformer

The 220 kV 3-Phase Oil-Immersed Electric Power Transformer combines cutting-edge low-loss design with robust protection to serve modern transmission systems. Independently developed from leading domestic and international techniques, this transformer delivers 30 % lower no-load losses than IEC benchmarks and exhibits partial-discharge levels under 80 pC at 1.5× rated voltage. Its conservator tank with silica-gel breather preserves oil integrity over –20 °C to +100 °C swings, while an IP55 enclosure shields critical components from dust and moisture. A ±8 × 1.5 % on-load tap changer on the high-voltage side enables fine voltage adjustments under load. Built per IEC 60076, ANSI/IEEE C57.12, and GOST R 52719, it offers high short-circuit withstand and long-term reliability, with zero field failures or oil leaks reported in service units.

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Product Accessories

Digital Supervisory Interface: Monitors transformer performance in real time.

Automated Load Tap Adjustment Module: Enables seamless voltage control under varying loads.

Oil Filtration & Condition Assessment Kit: Optimizes oil purity and insulation integrity.

High-Voltage Terminal Block Assembly: Provides secure, customized connectivity.

Dual Thermal & Pressure Sensor Suite: Continuously tracks operational conditions.

Vibration Absorption Isolation Kit: Minimizes mechanical stress for enhanced durability.

Surge Voltage Suppression Unit: Protects against transient overvoltage events.

Advanced Data Logging System: Records operational metrics for performance analysis.

Robust Grounding & Bonding Assembly: Ensures safe, reliable installation.

Comprehensive Installation & Maintenance Guide: Offers detailed support for setup and upkeep.

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Product Specifications

Rated Voltage (HV)

220 kV (nominal), up to 242 kV

Rated Voltage (LV)

Selectable 6.3 kV – 69 kV

Tap Changer Range

±8 × 1.25 % or ±8 × 1.5 %

Vector Group

YNd11

Cooling Method

ONAN / ONAF

No-Load Loss Reduction

≥ 30 % below IEC standard

Partial Discharge

< 80 pC at 1.5× rated voltage

Noise Level

≤ 58 dB (for ≤ 63 MVA units)

Short-Circuit Withstand

2 s at 2× rated current without damage

Efficiency

≥ 99.3 % at full load

Product Applications

Economy is more affordable

Supports reliable power distribution for railways, metro systems, and airport transit hubs.

Critical Transportation Networks
Supplies consistent, high-quality power for manufacturing and processing plants.

Heavy Industrial Facilities
Seamlessly integrates wind and solar installations into existing grids.

Distributed Renewable Energy Systems
Enhances city grid stability with precise voltage regulation.

Urban High-Voltage Substation Upgrades

Product Advantages

Ultra-Low Loss

Advanced core materials and optimized winding layout deliver no-load losses 30 % below IEC norms, cutting energy waste.

Superior Insulation & PD Control

Precision field calculations and high-grade insulating materials keep partial discharge under 80 pC, extending lifespan.

Robust Environmental Resilience

IP55 tank, silica-gel breather, and galvanized radiators ensure moisture-free, corrosion-resistant operation in harsh climates.

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.

Oil-immersed Electric Power Transformer 3 Phase Oil-immersed Electric Power Transformer 220KV 3 Phase Oil-immersed Electric Power Transformer

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