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20KV 2500KVA Three Phase Low Loss Distribution Transformer

20KV 2500KVA Three Phase Low Loss Distribution Transformer

The 20KV 2500KVA Three Phase Low Loss Distribution Transformer exemplifies modern advancements in high-voltage distribution technology. Its innovative oil-immersed design enhances power supply capacity, ensures superior voltage quality, and significantly reduces energy losses within the power system. This efficiency not only leads to substantial cost savings in power system construction but also promotes energy conservation. The transformer accommodates capacities ranging from 100kVA to 3000kVA. Its low-voltage windings typically feature a cylindrical structure crafted from copper foil, while the high-voltage windings employ a multi-layer cylindrical configuration. This design ensures uniform ampere-turn distribution, minimizes magnetic leakage, and enhances mechanical strength, resulting in robust short-circuit resistance. The core and windings are securely fastened with self-locking nuts, and the suspended core structure effectively withstands transportation stresses. Employing vacuum drying for the coil and core, along with vacuum filtering and oil injection processes for the transformer oil, minimizes internal moisture. The corrugated oil tank adapts to oil volume changes due to temperature variations, eliminating the need for an oil conservator and effectively isolating the transformer oil from external contaminants. These features collectively ensure maintenance-free operation under normal conditions, significantly reducing maintenance costs and extending the transformer's service life. Ideal for urban substations and heavy industrial networks, the transformer delivers ultra-low energy losses and precise voltage regulation, providing consistent and reliable power distribution.

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Product Accessories

Core (Magnetic Circuit System)
Material: High-permeability cold-rolled silicon steel sheet (e.g., 30ZH120), step-lap lamination process with staggered joints, achieving ultra-low no-load loss (S13 series reduces losses by approximately 30% compared to S11).
Features: Low hysteresis loss, noise-free design, suitable for frequent start-stop applications.

Windings (Electrical Circuit System)
High-Voltage Winding: The 20kV side adopts a multi-layer cylindrical structure, using copper (or aluminum) conductors wrapped with DMD insulation paper, enhancing short-circuit resistance.
Low-Voltage Winding: The 0.4kV side features copper foil winding, minimizing eddy current loss and improving heat dissipation efficiency.
Insulation Process: Vacuum Pressure Impregnation (VPI) with H-class insulation material, withstanding temperatures up to 180℃.

Cooling and Insulation System
Insulating Oil: Naphthenic mineral oil (or synthetic ester oil), with a breakdown voltage of ≥40kV at 20℃.
Radiator: Corrugated oil tank or panel radiator, utilizing natural oil circulation (ONAN) without reliance on fans.

Oil Tank and Sealing
Structure: Fully sealed corrugated steel oil tank, automatically compensating for oil volume changes, maintenance-free.
Protection Level: IP55, anti-corrosion coating, suitable for outdoor humid and dusty environments.

Protection Devices
Gas Relay: Monitors internal fault gases, triggering alarms or tripping protection.
Pressure Relief Valve: Provides overpressure protection, activation pressure ≤70kPa.
Temperature Controller: Bimetallic oil thermometer with PT100 remote transmission interface.

Tap Changer
Off-Load Tap Changer: ±5% tapping range on the high-voltage side (3 or 5 positions), manually adjustable for grid voltage fluctuations.

Bushings and Terminals
High-Voltage Bushings: Porcelain or silicone rubber composite bushings with a creepage distance ratio of ≥25mm/kV.
Low-Voltage Bushings: Resin-cast bushings with anti-pollution flashover design, tin-plated terminals to prevent oxidation.

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Product Specifications

Rated Capacity

2500KVA（2.5MVA）

Rated Voltage

High Voltage Side: 20kV ±5%, Low Voltage Side: 0.4kV

No-Load Loss (P₀)

≤1.8kW

Load Loss (Pₖ)

≤18kW (at 120℃)

Short-Circuit Impedance (Uk%)

4.5% or 6% (optional)

Efficiency

≥98.5% (at full load)

Insulation Level

High Voltage Side: LI125kV / AC50kV

Low Voltage Side: LI75kV / AC35kV

Cooling Method

ONAN (Oil Natural Air Natural)

Vector Group

Dyn11

Noise Level

≤52dB(A) (no-load, measured at 1m distance)

Product Applications

Economy is more affordable

Designed to supply stable, high-quality power to manufacturing plants and processing units with high energy demands.

Heavy Industrial Facilities
Suitable for modernizing urban distribution networks, ensuring reliable voltage levels and efficient energy management.

Municipal Power Grids
Ideal for large-scale commercial centers, providing consistent power performance for retail and business operations.

Commercial Developments
Perfect for upgrading legacy power systems with advanced, low-loss transformers to improve grid reliability and energy efficiency.

Utility Modernization Projects

Product Advantages

Optimized Energy Performance

Minimizes both no-load and load losses, enhancing overall efficiency and reducing operating costs.

Robust and Long-Lasting Design

Built with high-quality materials and innovative engineering techniques to ensure superior durability and extended service life.

Precise Voltage Stability

Delivers accurate voltage regulation even under variable load conditions, supporting uninterrupted power supply and system resilience.

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.