2500 kva transformer specifications (weight and size)-Dayuan Power Transformers

2500 kva transformer specifications

2025-08-09

The following are typical specifications of a 2500 kVA transformer in terms of weight and size. Please note that these are estimated values. If you need a transformer, please contact our company - Dayuan Power.

Key Factors Affecting Weight & Size

1. Type:

Liquid-Filled (Mineral Oil, Silicone, Ester): Most common for this rating. Heavier and larger than dry types, but more efficient and better cooled.

Dry-Type (Vacuum Pressure Impregnated - VPI, Vacuum Cast Coil - VCC, Open Wound - OW): Used indoors or where fire safety is critical. Lighter overall than liquid-filled but physically bulkier for the same rating. VCC is the most compact dry type.

2. Voltage Class (Primary/Secondary):

Common HV: 11kV, 13.8kV, 33kV

Common LV: 400V, 480V, 600V

Higher voltage = more insulation = larger & heavier.

3. Number of Windings:

Standard Two-Winding vs. Autotransformer (autotransformer is smaller/lighter).

4. Cooling Class:

Liquid: ONAN (Oil Natural Air Natural - radiators), ONAF (Oil Natural Air Forced - fans on radiators). ONAF units can be slightly smaller core but need radiator/fan space.

Dry: AA (Air Natural), AFA (Air Forced - with fans). Fan-cooled (AFA) allows a smaller core but needs space for fans.

5. Manufacturer & Design: Different manufacturers optimize differently.

6. Accessories: Bushings, conservator tank, radiators, control cabinet, protective devices add weight and size.

Estimated Specifications (Ranges)

Feature	Liquid-Filled (Oil) Transformer	Dry-Type Transformer (VPI/VCC)
Approx. Weight	5,000 kg - 10,000 kg(5 - 10 metric tons)	3,500 kg - 7,000 kg(3.5 - 7 metric tons)
Approx. Weight	(11,000 - 22,000 lbs)	(7,700 - 15,400 lbs)
Core+Coils Weight	~60-70% of Total Weight	~50-60% of Total Weight
Approx. Length	2,500 mm - 3,500 mm	2,000 mm - 3,000 mm
Approx. Length	(8.2 ft - 11.5 ft)	(6.6 ft - 9.8 ft)
Approx. Width	1,800 mm - 2,500 mm	1,600 mm - 2,200 mm
Approx. Width	(5.9 ft - 8.2 ft)	(5.2 ft - 7.2 ft)
Approx. Height	2,200 mm - 3,200 mm	2,200 mm - 2,800 mm
Approx. Height	(7.2 ft - 10.5 ft)	(7.2 ft - 9.2 ft)
Typical Cooling	ONAN or ONAF	AA or AFA
Primary Use	Outdoor/Indoor Substations	Indoor Installations (Commercial/Industrial)

Important Considerations

1. These are GENERAL RANGES: Always obtain specific dimensions and weights from the manufacturer's datasheet for the exact model and configuration you are considering. The variation within the ranges above can be substantial.

2. Installation Requirements:

Foundation: Must be designed to support the total weight (especially critical for dry types indoors on upper floors).

Clearances: Significant space is needed around the transformer for cooling air flow, safety, maintenance access, and (for liquid-filled) spill containment (bund walls). Doorways, corridors, and ceiling heights must accommodate movement and placement.

Access Routes: Verify the path from delivery point to final location can handle the transformer's weight and dimensions. Cranes or specialized lifting equipment are almost always required.

3. Lifting & Moving: Transformer skids have specific lifting points (lugs or hooks). Use only these points with appropriately rated rigging. Never lift by the bushings or radiators.

To get precise figures:

Contact transformer manufacturers (e.g., ABB, Siemens, GE, Schneider Electric, Eaton, Dayuan power, Hyundai, TBEA) or reputable distributors, providing them with your exact requirements:

Liquid or Dry Type

Primary Voltage (kV)

Secondary Voltage (V)

Vector Group (e.g., Dyn11, YNd1)

Impedance (%)

Required Standards (e.g., IEEE C57, IEC 60076)

Cooling Type (ONAN, ONAF, AA, AFA)

Accessory requirements (bushings, CTs, protections, cabinet)