630kVA Oil Immersed Self Cooled Transformer

This 630kVA oil immersed self cooled transformer represents a new generation of high-performance distribution transformers. Its core utilizes a 3D wound design based on an equilateral triangle configuration, ensuring the shortest and equal-length magnetic paths for all three phases with zero air gaps, while the core column cross-section approximates a circle. Compared to traditional equipment, it effectively reduces losses and noise, achieves precise three-phase balance, suppresses third harmonics, and offers significantly optimized electrical performance.

Supporting voltage levels of 10kV, 20kV, and 36kV, the unit employs an oil-immersed self-cooling method that requires no external cooling equipment, ensuring easy operation and maintenance as well as strong adaptability to various working conditions. It is widely used in urban and rural grids, industrial and mining enterprises, and integrated substation applications. Backed by a mature supply chain, Usune—a reliable power equipment supplier—provides standardized, high-quality products and comprehensive support services to global customers.

Core Structural Features and Technical Advantages

1. High-Precision, Low-Loss Core

The core is constructed from high-permeability grain-oriented silicon steel sheets, processed using imported GEORG cross-cutting equipment and a 45° seamless splicing technique to completely eliminate magnetic circuit air gaps. The sheets are formed into a multi-step circular cross-section, significantly reducing magnetic reluctance, no-load losses, and operating noise. This design resolves issues common to traditional transformers—such as three-phase imbalance and high losses—thereby ensuring long-term, low-consumption operation. 

2. High-Strength, Impact-Resistant Coil Structure

The high-voltage winding utilizes a cylindrical structure, while the low-voltage winding offers a choice between cylindrical and foil configurations to suit specific operating conditions. This design optimizes magnetic flux distribution, effectively enhancing the equipment's resistance to short-circuits and lightning surges while preventing localized overheating. It ensures superior operational stability and interference resistance, making it suitable for complex environments such as industrial sites and outdoor power grids.

3. Corrosion-Resistant, Durable Corrugated Oil Tank

The tank is manufactured from precision cold-rolled steel using a specialized corrugated tank production line and features an anti-corrosion surface coating, enabling it to withstand harsh conditions such as oil exposure and chemical corrosion. The corrugated design combines efficient heat dissipation with adaptive deformation capabilities; it accommodates the thermal expansion and contraction of the insulating oil, maintains a complete air seal to retard oil aging, and significantly extends the equipment's service life.

4. High-Safety Insulation Structure

The 630kVA oil immersed self cooled transformer employs a Class A insulation structure with concentric high- and low-voltage windings. The inter-coil insulation utilizes a composite design—combining paperboard sleeves with small oil gaps—to ensure high dielectric strength and excellent sealing performance. This design effectively mitigates safety risks such as leakage, short-circuits, and insulation breakdown, supports 24-hour continuous operation, and complies with national power safety standards.

Product Type

Energy Conservation and Economic Benefit Analysis

The 630kVA oil immersed self cooled transformer offers exceptional energy-saving and carbon-reduction capabilities. Standardized formulas allow for the precise calculation of annual electricity costs and carbon emissions, providing data-driven support for corporate energy-efficiency upgrades and cost management. The core formulas are as follows:

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

Compared to traditional, outdated transformers, this product features lower no-load and load losses, significantly reducing electricity costs and carbon emissions in alignment with green power upgrade policies. It offers high cost-effectiveness for long-term operation and a short payback period, delivering both economic and environmental value.

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 Cases

1. Urban and Rural Grid Upgrade Project

In a rural grid upgrade project in Zhejiang, outdated, high-loss equipment was replaced in batches. Addressing issues such as significant load fluctuations, three-phase imbalance, and excessive harmonics, this product—leveraging the advantages of a 3D wound core for voltage stabilization and balance—fundamentally improved power supply quality. Field measurements showed a reduction of over 30% in no-load loss per unit and a 40% drop in the power supply failure rate for the distribution area. The unit is well-suited to complex rural operating conditions, facilitating energy-efficient grid upgrades.

2. Heavy-Duty Truck Charging Station Project

A heavy-duty truck charging station in Suzhou deployed multiple units of this transformer model to support operations involving the frequent starting/stopping of charging piles and sudden load changes. With excellent heat dissipation performance (oil-immersed self-cooling), the transformer maintains stable and controllable coil temperatures during full-load operation without overheating-related trips. This ensures 24-hour uninterrupted station operation, effectively reducing costs associated with maintenance and downtime.

FAQ

Q1: What voltage levels and application scenarios are compatible with the Usune 630kVA oil immersed self cooled transformer?

The product supports all mainstream high-voltage ratings (10kV, 20kV, and 36kV) and is suitable for applications such as urban and rural grid upgrades, industrial and mining power distribution, charging stations, and prefabricated or modular substations. It features a fan-free, oil-immersed self-cooling design suitable for outdoor installation; it is resistant to temperature extremes, dust, and mild corrosion, offering exceptional adaptability to various operating conditions.

Q2: What are the specific energy-saving advantages of this transformer, and how does it reduce costs?

The product's core energy-saving feature is its 3D gapless wound core structure, which significantly lowers magnetic circuit, no-load, and load losses, while effectively reducing harmonic and heat-related losses. Under standard operating conditions, it reduces overall energy consumption by 20%–30% compared to conventional equipment of the same capacity. This leads to significant savings in annual electricity costs and reduced carbon emissions, aligning with green energy policies and delivering outstanding long-term economic benefits.

Q3: What are the advantages regarding equipment service life and daily operation and maintenance (O&M)?

The equipment utilizes an air-isolated corrugated oil tank and Class A anti-corrosion insulation materials, which significantly retard the aging of the oil and the unit itself, resulting in a longer service life than standard transformers. It boasts a low failure rate and strong resistance to shocks and interference. Routine maintenance requires only periodic checks of oil levels and insulation status, making O&M simple and cost-effective—ideal for scenarios requiring long-term, uninterrupted operation.