Oil Immersed Transformers 30kVA–2500kVA

Looking for a reliable, durable power solution for your industrial, commercial, or utility application? Oil immersed transformers are the undisputed backbone of medium-voltage power distribution worldwide.

 

As a leading manufacturer with over two decades of expertise, GNEE produces a comprehensive portfolio of high-performance oil immersed transformers spanning from compact 30kVA units to heavy-duty 2500kVA powerhouses.

 

This guide will walk you through our entire range, helping you select the perfect transformer for your specific voltage, load, and environmental requirements.

 

Why Choose Oil Immersed Transformers?

Oil immersed transformers use insulating mineral oil as both a coolant and dielectric medium.

 

This design offers unparalleled advantages:

• Superior Cooling: Efficient heat dissipation allows for higher overload capacity and longer lifespan.
• Proven Reliability: A century-old, robust technology with predictable maintenance needs.
• High Dielectric Strength: Excellent insulation properties protect against internal arcs and surges.
• Cost-Effectiveness: Lower initial and long-term costs compared to many dry-type alternatives for medium and high-power applications.

 

From small commercial buildings requiring a 30kVA unit to large industrial plants needing a 2500kVA behemoth, oil-cooled technology provides a dependable solution.

 

GNEE's Comprehensive Range: From 30kVA to 2500kVA

Our manufacturing capabilities cover the entire spectrum of standard power needs. Each capacity range is engineered for specific application domains:

1. Small Power (30kVA - 100kVA): Ideal for small factories, workshops, pump stations, and residential complexes. Compact, efficient, and designed for easy installation.
2. Medium Power (160kVA - 500kVA): The workhorse for commercial buildings, medium-sized plants, water treatment facilities, and school campuses. Balances power delivery with footprint.
3. Large Power (630kVA - 1600kVA): Built for heavy industry, large manufacturing facilities, mining operations, and district substations. Features enhanced cooling and robustness.
4. Extra Large Power (2000kVA - 2500kVA): Engineered for major infrastructure projects, utility substations, data center primary feeds, and large-scale industrial processing. Customizable to stringent grid codes.

 

Visual size comparison of four representative oil immersed transformers: 50kVA, 500kVA, 1000kVA, and 2500kVA.

 

Key Specifications & Selection Table (30kVA - 2500kVA)

 

Use this table as a starting point for your selection. All our oil filled transformers comply with international standards like IEC, IEEE, and GB.

Rated Capacity (kVA)	Typical Voltage Combination (HV/LV in kV)	Approx. Dimensions (LWH, mm)	Weight (Oil + Core, kg)
30 - 100	11/0.433, 22/0.433	1000x800x1200	500 - 1200
160 - 315	11/0.433, 22/0.433, 33/0.433	1500x1000x1600	1500 - 2800
400 - 630	11/0.433, 22/0.433, 33/0.433	1800x1200x2000	3000 - 4500
800 - 1250	11/0.433, 22/0.433, 33/11	2200x1500x2500	5000 - 8000
1600 - 2500	22/0.433, 33/11, 35/10.5	2800x2000x3000+	9000 - 15000+

 

Note: Exact specifications vary based on design (e.g., loss level: SBH15, SBH17), impedance, and accessory configuration. Consult our engineers for precise datasheets.

 

Core Features & Manufacturing Excellence Across All Sizes

 

Regardless of the kVA rating, every GNEE transformer is built with quality at its core:

• Core & Windings: Built with high-grade, low-loss, grain-oriented silicon steel (CRGO) and Class C or H copper/aluminum windings for maximum efficiency and thermal stability.
• Tank & Cooling: Sturdy corrugated or radiator-finned tanks provide optimal cooling surfaces. Options include hermetically sealed, free-breathing (with conservator), or sealed with gas cushion.
• Protection & Monitoring: Standard fittings include pressure relief device, thermometer, and Buchholz relay (on larger units). We offer advanced options like remote monitoring systems.
• Testing: Every unit undergoes full routine testing (ratio, polarity, winding resistance, insulation resistance, no-load/loss, and applied/induced voltage tests).

 

How to Select the Right kVA Rating for Your Project

Choosing the correct capacity is critical. Follow these steps:

• Calculate Total Load: Sum the nameplate kVA or kW of all equipment, applying appropriate diversity and demand factors. Our team can assist with load calculation.
• Consider Future Expansion: Add a 20-25% growth margin for future loads.
• Review Starting Currents: Motors have high inrush currents; ensure the transformer can handle them without excessive voltage drop.
• Match Voltage Levels: Confirm your incoming (HV) and required outgoing (LV) voltages.

For specialized applications like mining or offshore, we provide customized designs with enhanced protection.

 

 A professional substation installation featuring several GNEE oil immersed transformers with clear busbar connections and safety signage.

 

Beyond the Product: GNEE's Value-Added Services

We are your partner, not just a supplier:

• Technical Consultation: Our engineers help you select the optimal 30kVA to 2500kVA transformer model.
• Customization: Modifications to impedance, BIL, taps, and paint are available.
• Global Logistics: Expert packing and documentation for safe worldwide delivery.
• After-Sales Support: Comprehensive warranty and access to spare parts.

 

Conclusion: Power Your Project with the Right Transformer

Whether your project demands a modest 30kVA distribution transformer or a critical 2500kVA power transformer, GNEE offers a reliable, efficient, and cost-effective oil immersed solution across the entire spectrum. Our engineering expertise ensures you get a product tailored for performance and longevity.

Request A Quote

 

Ready to specify your transformer?

Contact the GNEE team today to discuss your project requirements.

Request a detailed technical datasheet for our 30kVA–2500kVA oil immersed transformers and receive a competitive quotation tailored to your needs.