Core Parameter Comparison Table: 630kVA, 1500kVA, 2500kVA Oil-Immersed Distribution Transformers

GNEE custom-builds every 630kVA, 1500kVA, or 2500kVA oil-immersed transformer to your exact site requirements - then backs it with truly global, zero-blind-spot after-sales support. With local distributors and service partners across 150+ countries, you get direct access to spare parts, technical guidance, and on-ground help wherever your project operates. No runaround, no dropped promises.

 

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GNEE factory – automatic corrugated tank line for oil-immersed distribution transformers.

 

 

What Are the Core Parameters for Oil-Immersed Distribution Transformer Comparison?

 

Before showing the full 630kVA, 1500kVA, 2500kVA oil-immersed distribution transformers specification table, it helps to understand what each parameter means for real-world installation and operation. The most important specifications covered in the comparison table below remain:

• Rated Capacity (kVA) – The apparent power the transformer can continuously deliver under rated conditions without exceeding temperature limits.
• High Voltage & Low Voltage – Standard 10 kV primary with 0.4 kV secondary is the baseline; custom voltages up to 35 kV are available from GNEE upon request.
• No-Load Loss (Iron Loss) – The fixed power consumed by the core just to keep the transformer energized, 24 hours a day regardless of load.
• Load Loss (Copper Loss) – The variable loss that increases with the square of the load current; measured at 75°C winding resistance.
• Impedance Voltage (%) – Dictates the voltage drop under load and affects short-circuit current magnitude; also influences parallel operation capability.
• Oil Weight and Total Weight – Directly determines foundation design, crane requirements, and transportation logistics.
• Dimensions (L×W×H) – Critical for substation layout, enclosure sizing, and indoor clearance planning.

 

Every parameter interacts with cost and operational efficiency. The table that follows uses one consistent 10 kV / 0.4 kV, Dyn11, S11-grade configuration so you can see true capacity-based differences at a glance.

 

 

Below is the definitive core parameter comparison table for 630kVA, 1500kVA, and 2500kVA oil-immersed distribution transformers based on factory-standard S11 copper-wound designs. For S13/S20/S22 high-efficiency series, the loss figures drop substantially, but the dimensional and weight profiles remain comparable.

 

Core Parameter	630 kVA	1500 kVA	2500 kVA
High Voltage (Primary)	10 kV / 11 kV	10 kV / 11 kV	10 kV / 11 kV
Low Voltage (Secondary)	0.4 kV	0.4 kV	0.4 kV
Frequency	50 Hz / 60 Hz	50 Hz / 60 Hz	50 Hz / 60 Hz
Vector Group	Dyn11	Dyn11	Dyn11
Tapping Range	±2×2.5% off-circuit	±2×2.5% off-circuit	±2×2.5% off-circuit
Impedance Voltage (%)	4.5%	5.0%	6.0%
No-Load Loss (S11 typical)	810 W	1960 W	2700 W
Load Loss at 75°C (S11 typical)	6,200 W	13,900 W	20,500 W
Oil Weight (approx.)	320 kg	620 kg	1,050 kg
Total Weight (approx.)	1,950 kg	3,850 kg	6,150 kg
Dimensions L×W×H (approx.)	1,520 × 980 × 1,460 mm	1,880 × 1,300 × 1,820 mm	2,330 × 1,750 × 2,360 mm
Cooling Method	ONAN	ONAN	ONAN
Winding Material	Copper	Copper	Copper
Applicable Standard	IEC 60076	IEC 60076	IEC 60076

 

Note: All values are typical for S11-grade, 10kV/0.4kV, Dyn11, hermetically sealed oil-immersed transformers. GNEE also supplies S13, S20, S22, and amorphous metal core versions with significantly lower losses. Custom HV ratings up to 35 kV and LV up to 480 V are available. On-load tap changers (OLTC) and forced cooling (ONAF) can be integrated upon request.

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No-Load Loss Comparison Across 630kVA, 1500kVA, and 2500kVA Oil-Immersed Transformers

No-load (core) loss is the continuous background cost every transformer owner pays. According to the comparison table, a 630 kVA unit draws only 810 W for core excitation, the 1500 kVA unit 1,960 W, and the 2500 kVA unit 2,700 W. Over one year of uninterrupted operation (8,760 hours), these fixed losses translate into total no-load energy consumptions of roughly 7,100 kWh, 17,200 kWh, and 23,700 kWh respectively - a factor that directly influences the payback calculation when upgrading from S11 to S13 or S20 efficiency grades.

 

Load Loss Impact on Total Operating Cost for 630kVA, 1500kVA, 2500kVA Oil-Immersed Transformers

Load loss grows disproportionately with capacity, and so does its cost impact. At 75°C full-load conditions, copper loss reaches 6.2 kW for 630 kVA, 13.9 kW for 1500 kVA, and 20.5 kW for 2500 kVA. If a 2500 kVA transformer runs at 70% average load during production hours, its load loss alone can exceed 100,000 kWh annually - over ten times the no-load contribution. This is why many project owners now mandate the high-efficiency S20/S22 series, where load loss can drop by 15–20% compared to S11 baseline, often recovering the incremental transformer cost within 2–4 years of operation.

 

 

One of the most practical takeaways from the core parameter comparison table for 630kVA, 1500kVA, and 2500kVA oil-immersed transformers is the jump in physical size.

A 630 kVA unit fits into a footprint of approximately 1.5 × 1.0 meters and weighs under 2 tonnes, while the 2500 kVA version spans over 2.3 × 1.8 meters and exceeds 6 tonnes.

Oil weight alone moves from 320 kg to over a ton, which means the 2500 kVA transformer demands a reinforced concrete pad, an oil containment pit sized for the full oil volume, and heavy-lift crane access during placement.

 

For indoor or rooftop-mounted substations, these constraints can make dual smaller-capacity units a viable alternative - a topic our GNEE project engineers frequently discuss with clients during the quotation phase.

 

 2500kVA oil-immersed transformer for export loading
 

 

Having a reliable Core Parameter Comparison Table: 630kVA, 1500kVA, 2500kVA Oil-Immersed Distribution Transformers puts the critical engineering numbers - losses, weight, dimensions, and impedance - right in front of you. Now it's time to turn those specifications into a concrete factory-direct offer.

 

Whether your next project needs a single 630 kVA unit for a commercial building, a 1500 kVA workhorse for a processing plant, or a 2500 kVA backbone for a utility substation, GNEE's team stands ready to deliver a fully certified, test-inspected transformer that matches your exact core parameters.

 

Don't let vague web pricing or one-size-fits-all datasheets delay your procurement. Send us your primary voltage, secondary voltage, efficiency preference, and any special enclosure or monitoring requirements. You'll receive a detailed, obligation-free technical and commercial proposal within one business day.

 

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What is a 1500 kVA transformer?

Transformer Features: With a transformer rating of 1500 KVA (1.5 MVA), the industrial transformer features a primary voltage of three-phase 12470Y/7200 grounded Wye and a secondary voltage of three-phase 480Y/277 Wye. The unit has a primary radial feed for single installations and dead-front primary connections.

 

What is the load capacity of a 1500 kVA transformer?

A 1500 kVA transformer can supply up to 1500 kVA of apparent power. For typical loads with 0.85 power factor, this equals approximately 1275.0 kW of real power.

 

What size is a 1500 kVA dry type transformer?

1500 kVA Dry Type Transformer Dimensions
Our 1500 kVA dry type transformers come with customizable dimensions typically ranging from 1700 mm to 1900 mm (length), 1100 mm to 1300 mm (width), and 1800 mm to 2100 mm (height).

 

How much oil is in a 1500kVA transformer?

The oil capacity of a 1500 kVA transformer is typically around 1000 to 1200 liters. The exact amount can vary based on the design, construction, and cooling requirements of the specific transformer model.

 

What does 2500 kVA mean?

kVA stands for kilovolt-amperes, a measure of apparent power. It's the total power a generator can supply, covering both the energy that runs your equipment (real power) and the energy that keeps the system stable (reactive power).

 

How much oil is in a 2500 kVA transformer?

The transformer oil of a 2500 kVA, 13.8kv pad-mounted transformer is 383 Gal. 2500 kva transformer weight is about 13889lbs. Normally 1 x 40 HQ can load 4 units 2500kva, 13.8 kV pad-mounted transformer to North America.

 

Can GNEE customize the core parameters of 630kVA, 1500kVA, 2500kVA oil-immersed transformers?

Absolutely. Every parameter in the comparison table - HV/LV ratings, tapping range, vector group, impedance percentage, efficiency grade (S11 through S22 and amorphous), and even cooling type - can be adjusted to your project specification. Simply send your single-line diagram or datasheet to sales@gneeelectric.com, and our engineering team will return a precise technical proposal.

 

What is the price difference between 630kVA, 1500kVA, and 2500kVA oil-immersed transformers?

Oil-immersed transformer cost scales with capacity but not linearly - a 2500kVA unit typically ranges from 18,000to18,000to36,000 factory-direct depending on the copper price cycle, efficiency grade, and voltage configuration, while a 630kVA unit lands between roughly 6,000and6,000and11,000. GNEE provides transparent, line-item quotations so you can see exactly what drives the cost.

 

Do these core parameter comparison tables apply to 60 Hz systems?

Yes. GNEE manufactures 630kVA, 1500kVA, and 2500kVA oil-immersed transformers for both 50 Hz and 60 Hz markets, with compliance to local grid standards. All parameters, including losses and temperature rise, are recalculated and tested under 60 Hz conditions before shipment.