4000KVAThree Phase Oil Immersed Transformer

The Usune 4000kVA three phase oil immersed transformer covers the three mainstream voltage levels of 10kV, 20kV, and 36kV, representing an upgraded, high-efficiency, energy-saving distribution transformer. Moving away from traditional stacked-lamination core structures, it adopts an equilateral triangular 3D wound core layout. This design results in a core column cross-section approaching a circle, tight winding fit, and a gapless magnetic circuit, fundamentally resolving common issues found in traditional transformers such as three-phase imbalance, high operating losses, and excessive noise.

Backed by standardized production lines and rigorous quality control systems, the product offers strong environmental adaptability and high operational stability. It meets the long-term, reliable power supply demands of complex scenarios—including grid upgrades, industrial production, and prefabricated substation integration—while delivering excellent energy-saving benefits and economic value.

Core Structural Features and Product Advantages

1. Optimized Core Structure: Ultra-low Loss and Quiet Operation

The core is constructed from high-purity grain-oriented silicon steel sheets, processed using imported German Georg cross-cutting equipment. It utilizes a precision 45° jointing process and a multi-stage circular cross-section structure formed by lamination, effectively reducing magnetic leakage and hysteresis losses. The equilateral triangular layout ensures that the magnetic paths for all three phases are equal and minimized. By completely eliminating magnetic circuit air gaps, the design significantly reduces no-load losses and operating noise, suppresses third-harmonic generation, and achieves precise three-phase power balance.

2. Reinforced coil design with superior short-circuit and impact resistance

The high-voltage coil utilizes a cylindrical winding design, while the low-voltage coil supports both cylindrical and foil winding processes. The optimized coil structure ensures a rational magnetic circuit distribution, significantly enhancing the transformer's resistance to short-circuit impacts and overloads, thereby effectively preventing coil deformation or equipment failure caused by grid fluctuations. The concentric winding structure improves overall structural stability, ensuring safe and stable operation under long-term load conditions.

3. Corrosion-resistant corrugated tank designed for harsh conditions and long service life

The tank is fabricated from high-precision cold-rolled steel using a specialized Georg corrugated tank production line. The surface is coated with a petrochemical-grade, specialized anti-corrosion finish that resists oil and chemical corrosion, making it suitable for various harsh industrial operating environments. The integrated corrugated structure provides efficient heat dissipation and automatically accommodates the thermal expansion and contraction of the transformer oil; additionally, the air-isolated internal design effectively slows the aging of the insulating oil, significantly extending the equipment's overall service life.

4. Class A insulation structure ensuring a high operational safety factor

The 4000kVA three phase oil immersed transformer employs a Class A insulation structure throughout. With high- and low-voltage coils arranged concentrically, the inter-coil gap utilizes a design combining paperboard sleeves and small oil gaps to optimize internal insulation and heat dissipation systems. This effectively enhances the equipment's insulation strength, eliminates insulation breakdown incidents, and ensures continuous, safe operation under rated load and moderate overload conditions.

Product Type

Energy Conservation, Carbon Reduction, and Economic Benefits

The Usune 4000kVA three phase oil immersed transformer boasts excellent energy-saving performance. Annual operating costs and carbon emissions can be accurately calculated using standard industry formulas, providing data support for project energy assessments and cost budgeting:

1. Annual electricity cost formula: Annual Electricity Cost (CNY/year) = [No-load Loss (kW) + Load Loss (kW) × (Average Load Rate)²] × 365 days × 24 hours × Electricity Price
2. Annual carbon emission formula: Annual CO₂ Emissions = [No-load Loss (kW) + Load Loss (kW) × (Average Load Rate)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. In scenarios requiring long-term continuous operation—such as industrial production and urban power grids—it effectively lowers electricity costs and reduces carbon emissions. It fully complies with grid energy-saving standards and green industrial production requirements, 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

Practical Engineering Application Cases

Case 1: Power Distribution Project for a Textile Industrial Park

A large textile group in Shandong operates its production lines continuously year-round, demanding extremely high power supply stability. The project utilizes multiple Usune 4000kVA 10kV oil-immersed transformers to handle the park's core power distribution. Since commissioning, the equipment has operated smoothly with low noise and low energy consumption. It resolved previous issues—such as three-phase voltage instability and high energy consumption associated with aging transformers—thereby effectively reducing the enterprise's annual electricity and O&M costs while ensuring a stable power supply for the textile production lines.

Case 2: Supporting Project for Urban Prefabricated Substations

For a power grid upgrade project in a coastal city in southern China, Usune 4000kVA 20kV oil-immersed transformers were selected to equip prefabricated substations. Featuring a compact structure and strong environmental adaptability, the product fits perfectly into compact urban layouts and withstands complex outdoor operating conditions. The equipment has operated safely for over two years without harmonic interference and with stable voltage output, significantly improving power supply quality for urban commercial and residential areas and facilitating the efficient implementation of the city's grid upgrade.

FAQ

Q1: What voltage ratings and application scenarios does the Usune 4000kVA oil-immersed transformer support?

This product supports three mainstream voltage ratings—10kV, 20kV, and 36kV—covering standard civil and industrial power distribution scenarios. It is particularly well-suited for urban and rural grid upgrades and power supply for industrial and mining enterprises. It integrates seamlessly with modular substations and prefabricated containerized substations, demonstrating exceptional versatility across applications.

Q2: What are the key energy-saving advantages of this product compared to traditional transformers?

The product features a 3D equilateral triangular wound core structure; the magnetic circuit is gapless, with the three-phase magnetic paths being both shortest and equal in length, which drastically reduces no-load and magnetic leakage losses. Combined with precision silicon steel sheet cutting and an optimized coil structure, it minimizes operating energy consumption and noise. Long-term operation yields significant reductions in electricity costs and carbon emissions, fully complying with State Grid standards for green energy efficiency.

Q3: How does the 4000kVA three phase oil immersed transformer perform in terms of environmental adaptability and service life?

The equipment utilizes Class A insulation and industrial-grade anti-corrosion coatings, enabling it to withstand oil contamination, chemical corrosion, and temperature fluctuations—making it suitable for various harsh operating conditions. The corrugated oil tank isolates the unit from air, effectively delaying insulation oil aging and reducing the frequency of oil changes and maintenance. Under standard operating conditions, the transformer offers a long service life and low maintenance costs, ensuring stable performance in diverse environments such as industrial production facilities and outdoor power grids.