How Much Does a 1000 kVA Oil-Immersed Transformer Weigh? Factors Affecting Weight & Common Data

When planning an electrical substation or industrial power upgrade, understanding the physical specifications of your equipment is just as vital as the electrical ratings. One of the most frequent questions we receive is: "How much does a 1000 kVA oil-immersed transformer weigh?" Weight affects everything from shipping costs and crane requirements to the structural design of the installation pad.

 

As a professional, Tier-1 1000 kVA oil-immersed transformer manufacturer, GNEE specializes in engineering high-performance distribution solutions that meet global standards like IEC 60076 and ANSI/IEEE. Operating from our state-of-the-art factory, we provide precision-engineered transformers with transparent technical data to ensure your project's logistics are seamless.

 

In this guide, we will break down the typical weight ranges and the specific components that contribute to the total mass of a 1000 kVA unit.

 

 

The total weight of a 1000 kVA oil-immersed transformer is not a single fixed number. It varies based on the manufacturer's design, the efficiency class, and most importantly, the winding material used.

 

General Weight Estimates

On average, a standard 1000 kVA oil-immersed transformer will weigh between 1,800 kg and 2,800 kg (approx. 3,968 lbs to 6,172 lbs).

• Aluminum-wound units usually fall on the lighter end of this spectrum (approx. 1,800 kg - 2,200 kg).
• Copper-wound units are significantly heavier due to the density of the metal (approx. 2,300 kg - 2,800 kg).

 

These figures include the "transport weight" (the unit with oil) and the "active part" (core and coils). Understanding these variations is essential for ensuring your transport vehicle and foundation are appropriately rated.

 

 1000 kVA oil-immersed transformers being weighed

 

 

Several internal components dictate the final scale reading of a 1000 kVA oil-immersed transformer. As a manufacturer, GNEE optimizes these components to balance efficiency with structural integrity.

 

The Active Part (Core and Windings)

The active part is the heaviest internal component. It consists of the silicon steel core and the conductive windings.

 

• The Core: High-quality, cold-rolled grain-oriented (CRGO) silicon steel is used to minimize losses. For a 1000 kVA unit, the core alone can weigh over 800 kg.

 

• The Windings: As discussed in previous guides, copper is much denser than aluminum. While an aluminum winding must be physically larger to conduct the same current, a copper winding of the same rating will still result in a heavier overall transformer.

 

Insulation Oil Volume

The "oil-immersed" aspect adds substantial weight. The oil serves two purposes: insulation and cooling. A 1000 kVA oil-immersed transformer typically requires between 400 and 600 liters of transformer oil. Given that transformer oil has a density of approximately 0.85 kg/L , the oil adds roughly 340 kg to 510 kg to the total weight.

 

 

The housing of the 1000 kVA oil-immersed transformer must be robust enough to hold the active part and the heavy insulating oil without leaking or deforming under pressure.

 

Steel Tank Weight

The tank is constructed from high-grade carbon steel plates. A 1000 kVA unit requires a reinforced tank with a thickness usually ranging from 5mm to 8mm. The tank, including the base frame and the top cover, adds several hundred kilograms to the total weight.

 

Cooling Radiators (Fins)

To dissipate the heat generated during operation, the 1000 kVA oil-immersed transformer features corrugated fins or radiators. These components increase the surface area for air cooling. Because they are made of steel and filled with oil, they contribute significantly to the "wet weight" of the unit.

 

At GNEE, we use automated welding to ensure these radiators are leak-proof and structurally sound.

 

 

 Technicians assembling the steel tank and corrugated cooling fins for a 1000 kVA transformer

 

 

To help your engineering team plan, here is a standard data table for a GNEE 1000 kVA oil-immersed transformer (Standard 10kV to 0.4kV).

Description	Copper Winding (GNEE Std)	Aluminum Winding (GNEE Std)
Total Weight (Approx.)	2,450 kg	1,950 kg
Oil Weight	480 kg	520 kg (Larger tank)
Active Part Weight	1,350 kg	950 kg
Tank & Accessories	620 kg	480 kg
Dimensions (L x W x H)	1750 x 1100 x 1450 mm	1850 x 1200 x 1500 mm
Cooling Type	ONAN	ONAN

Note: These values are typical estimates. Specific weights depend on efficiency requirements (e.g., Tier 2 vs. Standard losses)

 

 

When you choose GNEE as your 1000 kVA oil-immersed transformer manufacturer, you are choosing accuracy. We provide detailed "As-Built" drawings and weight certificates before the unit leaves our factory.

 

Expertise and Reliability

Our engineers use advanced CAD and electromagnetic simulation software to ensure that every gram of material in the 1000 kVA oil-immersed transformer serves a purpose. We don't over-engineer to add unnecessary weight, nor do we under-engineer and compromise on safety. Our factory follows ISO 9001 quality management systems, ensuring that the transformer you receive matches the specifications promised in the quote.

 

Safe Transport and Installation

Knowing the exact 1000 kVA oil-immersed transformer weight is critical for safe handling. We provide heavy-duty lifting lugs and a reinforced base frame suitable for skidding or rolling. Our packaging is designed for international sea freight, using vacuum-sealed protection and robust wooden or steel frames to ensure the unit arrives in perfect condition.

 

 

Does a higher-efficiency 1000 kVA transformer weigh more?
Generally, yes. To achieve lower losses, manufacturers often use more silicon steel in the core and more conductive material in the windings, which increases the total 1000 kVA oil-immersed transformer weight.

 

Can GNEE customize the weight for specific site constraints?
While physical laws limit how light a transformer can be, we can optimize the tank dimensions and radiator layout to fit specific weight distribution requirements for rooftops or mobile substations.

 

How much does a 1000 kVA transformer weigh?

6800 lbs.

KVA 1000/1330. S/N GO# MVG 02269. Weight 6800 lbs.

 

What is the current of a 1000 kVA transformer?

For a 1000 kVA transformer at 415V, the full load current is ~1392A, with 75% load at 1044A. Use the rule of thumb: I ≈ kVA × 1.4 for quick estimates (1400A)

 

How many amps is a 1000 kVA transformer?

A 1000 kVA transformer is generally utilized in the process of transforming a high-voltage power supply line into a low-voltage power supply line. It uses kilovolt-amperes as the units of measurement for the transformer's apparent power (kVA). It is capable of withstanding a voltage of 120 and an amperage of 8333

 

What is a 1000kva transformer?

A 1000 kVA transformer is an electrical device that operates at a capacity of 1000 kVA (kilo volt amperes). The kVA rating indicates the transformer's maximum capacity to handle electrical power. This type of transformer is typically used for medium-to-high power applications where voltage regulation is critical.

 

 

 

Calculating the 1000 kVA oil-immersed transformer weight is a vital step in your procurement process, impacting everything from your foundation design to your bottom line. Whether you choose a copper-wound unit for its compact weight and efficiency or an aluminum-wound unit for its lighter profile and cost savings, GNEE ensures the highest manufacturing standards are met.

Request A Quote

 

As a leading factory-direct supplier, GNEE provides the transparency, technical documentation, and competitive pricing you need to keep your project on track.

 

Do you need the exact dimensions and weight for your specific 1000 kVA project? Contact the experts at GNEE today! Our team will provide a detailed technical datasheet and a factory-direct quote within 24 hours.