2500KVA Liquid Immersed Distribution Transformers

Optimized for 10kV, 20kV, and 36kV medium-voltage distribution applications, Usune 2500kVA liquid immersed distribution transformers differ from traditional stacked-core models by utilizing an equilateral triangular 3D wound core structure, resulting in a more efficient magnetic circuit system. The design achieves a gapless magnetic circuit with equal and minimal path lengths across all three phases, significantly reducing no-load losses and operating noise while ensuring high-precision three-phase balance and third-harmonic suppression. Combined with mature oil-immersed insulation technology and industrial-grade anti-corrosion design, the transformers adapt to complex operating conditions and fully meet the standardization requirements of modern smart grids.

Manufactured and tested in strict accordance with industry standards, these transformers are suitable for grid upgrades in urban and rural areas as well as power supply for industrial and mining enterprises. They integrate seamlessly with combined transformers and prefabricated substations, offering strong application versatility and high operational stability.

Core Structural Features and Technical Advantages

1. Optimized Core Structure: Low Loss and Low Noise

The core utilizes high-permeability, low-hysteresis grain-oriented silicon steel sheets. These are precision-cut using German GEORG cross-cutting equipment and assembled via a 45° seamless joint process. The sheets are stacked to form a multi-step circular cross-section, completely eliminating magnetic leakage and air-gap losses. This effectively reduces no-load power consumption and operating noise, ensuring long-term magnetic circuit stability and consistent performance.

2. High-strength coil design with excellent short-circuit resistance

The 2500kVA liquid immersed distribution transformers feature a differentiated coil configuration: the high-voltage coil utilizes a cylindrical structure, while the low-voltage coil offers a choice between cylindrical and foil-type structures. This design significantly enhances the equipment's resistance to short-circuit impact and mechanical stability, effectively preventing coil deformation or damage caused by sudden grid short circuits. Additionally, it optimizes magnetic field distribution, ensuring more efficient magnetic circuit operation and higher overall power transmission efficiency.

3. Industrial-grade tank offering high durability and versatility

The tank is constructed from high-precision cold-rolled steel sheets, fabricated on a specialized GEORG corrugated tank production line. The surface is finished with a petrochemical-grade anti-corrosion coating that resists oil, chemicals, and oxidation, making it suitable for harsh industrial environments and outdoor operating conditions. The corrugated structure provides efficient heat dissipation while accommodating the thermal expansion and contraction of the insulating oil during operation. A fully sealed design isolates the unit from air, significantly slowing the aging of the insulating oil and extending the equipment's overall service life.

4. Class A insulation structure ensuring safe and stable operation

The equipment employs a Class A insulation system with concentric high- and low-voltage coil arrangements; the inter-coil gap utilizes a structure combining paperboard sleeves with small oil-gap barriers. This layered insulation design evenly distributes electric field stress and enhances overall insulation strength, effectively preventing insulation breakdown and discharge faults, thereby ensuring safe, long-term operation under both rated and partial load conditions.

Product Type

Energy Conservation and Economic Benefits

The Usune 2500kVA liquid-immersed distribution transformer offers significant energy-saving advantages, effectively reducing both operational costs and carbon emissions for enterprises. The core benefit calculation formulas below allow for the precise quantification of economic and environmental value:

1.Annual Electricity Cost Formula: Annual Electricity Cost (CNY/year) = [No-load Loss (kW) + Load Loss (kW) × (Average Load Factor)²] × 365 days × 24 hours × Electricity Price
2.Carbon Emission Formula: Annual CO₂ Emissions = [No-load Loss (kW) + Load Loss (kW) × (Average Load Factor)²] × 365 days × 24 hours × Carbon Emission Factor (kg-CO₂/kWh)

Compared to traditional transformers of the same capacity, this product features lower no-load and load losses. Long-term operation continuously lowers electricity costs and reduces carbon emissions, aligning with "Dual Carbon" policies and corporate green production standards while delivering outstanding economic and environmental benefits.

Technical Parameters

10kV S11 series three-phase oil-immersed distribution transformer

Note: For transfomers with rated capacity of 500 kVA and below,the load loss above the ramp in the table is applicable to the Dyn11 connection group,and the load loss below the ramp is applicable to the Yyn0 connection group.

10kV S13 series three-phase ol-immersed distribution transformer

10kV S14 series three-phase oil-immersed distribution transformer

Project Reference

Cas-space Rocket Launch Project

Test Report

Real-World Application Case

In 2025, eight Usune 2500kVA 10kV liquid-immersed distribution transformers were successfully deployed in a key urban-rural grid renovation project in Shouguang, Shandong. These units supply power to modern agricultural greenhouses, industrial parks, and residential areas—applications that demand rigorous standards for equipment stability, energy efficiency, and environmental adaptability.

Following commissioning, the prefabricated substation units operated stably throughout the year without failure. Measured operating noise remained below 55dB, three-phase imbalance was less than 1%, and third-harmonic suppression performance was excellent. Compared to the legacy transformers they replaced, the project achieved a 17.8% reduction in total losses and saved over CNY 260,000 in annual electricity costs. The fully sealed tank design eliminates issues related to insulating oil aging and leakage; the zero-failure annual performance fully validates the product's stability and energy-saving advantages in urban-rural grid environments.

FAQ

Q1: What voltage levels and application scenarios do Usune 2500kVA liquid immersed distribution transformers support?

The product line covers medium-voltage levels of 10kV, 20kV, and 36kV, making it suitable for urban-rural grid renovations, industrial and mining enterprises, commercial parks, and residential power supply scenarios. Specialized optimizations have been implemented for combined transformers and prefabricated substations, enabling them to meet installation and operational requirements for outdoor environments, harsh industrial conditions, and compact urban distribution sites.

Q2: What are the core advantages of this product compared to traditional transformers of the same capacity?

There are three core advantages: First, it utilizes a gapless, three-dimensional wound core structure, resulting in lower losses and noise, as well as more balanced and stable three-phase power supply. Second, the optimized coil and tank structures provide superior short-circuit and corrosion resistance, leading to a lower equipment failure rate. Third, the fully sealed, air-isolated design slows the aging of insulating oil, extending the service life by over 20% compared to traditional equipment and reducing long-term operation and maintenance costs.

Q3: How are the energy-saving and carbon-reduction benefits of the 2500kVA liquid immersed distribution transformers demonstrated in actual operation?

The product minimizes operating losses at the source through optimized magnetic circuits and structural design; measured no-load and load losses outperform those of traditional equipment meeting national standards. Based on standardized energy consumption and carbon emission formulas, long-term operation consistently lowers electricity costs for enterprises. Furthermore, reduced energy losses directly cut carbon emissions on the power supply side, facilitating green, low-carbon upgrades for grid projects and manufacturing enterprises, thereby delivering both economic and environmental value.