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11KV 2500KVA Three Phase Low Loss Distribution Transformer

11KV 2500KVA Three Phase Low Loss Distribution Transformer

The 11KV 2500KVA Three Phase Low Loss Distribution Transformer represents a breakthrough in power distribution technology, meticulously engineered for optimal efficiency and reliability. Utilizing innovative coil and core manufacturing methods, this transformer features a uniquely configured three-dimensional wound core assembled from high-grade cold-rolled silicon steel, precision-cut via CNC to ensure a balanced magnetic circuit with significantly reduced no-load and load losses. Advanced vacuum annealing processes eliminate residual stresses and enhance magnetic permeability, while specially designed high and low voltage winding techniques deliver a robust, compact structure with minimal noise and reduced no-load current. With its oil-immersed design and fully sealed construction, the transformer not only achieves precise voltage regulation and energy-saving performance but also withstands environmental challenges, making it an ideal solution for modern urban grids, industrial applications, and green energy initiatives.

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Product Accessories

Core System
Material: High-permeability cold-rolled silicon steel (e.g., 30ZH120) with a fully mitered step-lap design, reducing no-load losses by 37%.
Features: Ultra-low noise (20% below standards), strong short-circuit resistance, and anti-corrosion resin coating for durability.

Winding System
High Voltage (11kV): Multi-layer cylindrical structure with copper/aluminum conductors and DMD insulation for enhanced strength.
Low Voltage (0.4kV): Copper foil winding minimizes eddy current losses and improves cooling.
Insulation: VPI + H-class materials (180°C rating) for long-term reliability.

Tank & Cooling
Structure: Fully sealed corrugated steel tank with self-adjusting fins, maintenance-free.
Cooling: ONAN system with radiator fins for efficient heat dissipation.

Protection
Pressure Relief Valve: Activates at ≥35kPa to prevent tank rupture.
Gas Relay: Detects internal faults, triggering alarms/trips (800kVA+).
Temperature Monitoring: Remote alarm-ready oil thermometer (1000kVA+).

Tap Changer
NLTC: ±5% or ±2×2.5% voltage adjustment for grid stability.

Bushings & Terminals
HV: Porcelain/composite with ≥25mm/kV creepage for pollution resistance.
LV: Resin-cast, tin-plated for oxidation resistance and high current capacity.

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Product Specifications

Rated Voltage

Primary: 11kV

Secondary: 0.4kV

Rated Capacity

2500KVA（2.5MVA）

No-load Loss

As low as 1830W, achieving 20%-45% lower losses than conventional S11 models for enhanced energy efficiency.

On-load Loss

21,200W, utilizing fully copper windings and optimized design to minimize operational energy consumption.

Vector Group

Dyn11 or Yyn0, providing enhanced harmonic suppression and compatibility with various grid configurations.

Cooling System

Oil-immersed natural cooling (ONAN) – passive cooling system that eliminates the need for additional cooling equipment, reducing maintenance requirements.

Short-Circuit Impedance

Typically 5%, ensuring stability under short-circuit conditions.

Noise Level

7-10dB lower than standard transformers, making it ideal for residential and noise-sensitive areas.

Frequency

50Hz, fully compliant with international power grid standards.

Certifications & Standards

Compliant with IEC 60076, ISO 9001, and select models certified by UL, CSA, ensuring superior safety and reliability.

Product Applications

Economy is more affordable

Ensures stable power distribution with low noise and high efficiency, ideal for residential and commercial districts.

Urban Power Grids
Supports large-scale manufacturing plants with reliable voltage regulation and reduced operational energy loss.

Industrial Facilities
Compatible with solar and wind energy applications, optimizing energy transmission with minimal loss.

Renewable Energy Systems
Enhances power accessibility in remote areas with a fully sealed, low-maintenance design.

Rural Electrification Projects

Product Advantages

Superior Energy Efficiency

Optimized core design reduces no-load losses by up to 45% and no-load current by up to 80%, significantly lowering energy consumption.

Extended Service Life

Fully sealed oil tank prevents insulation degradation, ensuring long-term reliability and minimal maintenance.

Compact & Low-Noise Operation

Integrated corrugated radiator design eliminates the need for an oil conservator, reducing size while lowering noise levels by 7-10dB, making it ideal for noise-sensitive environments.

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.