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How do you Lift a Transformer

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  • Admin
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  • Transformers, lifting transformers, power transformer
  • Posted date:
  • 06-06-2021
How do you Lift a Transformer

Do you want to know: How do you lift a transformer? We look at what transformers are used for and how they are lifted for relocation.

What is a Power Transformer Used for?

There are a few purposes for using power transformers. The most common purpose of using an electric power transformer is to convert AC (Alternating Current) power from AC voltage/current to another AC voltage/current.  

 Another common use for an electric power transformer is to provide isolation between electrical circuits.

How does a power transformer work?

In the simplest form, a power transformer is like an electromagnetic device used to transform power.  There are three main parts to the transformer—the typically ferromagnetic core or iron and two individual wire coils. These two sets of coils are usually referred to as primary and secondary windings.  

When current goes through these wires, the energy created an EMF wave and the current is passed from one coil to the other.  

 After testing, it was discovered that using a solid core was not the most efficient as there was a lot of energy wasted in heat. Because of this, the iron plates were laminated for better heat distribution.

How do you lift a transformer?

The main function of the power transformer is to either step up or step down the voltage from the primary and secondary wiring. 

This step is done by adjusting the coil ratio between the primary and secondary coil. For example, if the first had two coils and the second had 4, the ratio is 1:2, which means the voltage would double from the primary to the secondary coil. 

Now, if you were to flip this ratio around, it would be 2:1. When the energy is passed from the primary to the secondary coil, the voltage is actually halved instead of doubled.  There are a variety of transformers available depending on your needs.

How Big is a Power Transformer?

How Big is a Power Transformer?

There are a few steps in sizing up your transformer. 

Firstly, you can determine your power transformer size by calculating the demand load (Use NEC Article 220) and apply this to any applicable demand factors. Basing on the types of loads served, the demand factors can reduce the calculated load, which will help determine the correct size of the transformer. 

Once this step has been done, some other considerations are considered, such as the future flexibility, available space, project type, and cost.     

How Can I Estimate the Weight of a Transformer?

The calculation for your power transformer weight is generally the capacity of the transformer in Kilovolts, multiplied by the BIL or basic impulse insulation level. 

This should give a reasonable estimate for the power transformers weight. The transformer information is usually available for everyone, so getting this calculation done should be relatively easy.

Planning a Power transformer Lift

Ensure you have confirmed the power transformer's exact location and orientation before lifting the transformer onto the foundation.  

 For loading and unloading your transformer from the transport truck, you should have a hydraulic crane and check the capacity for this crane. Ensure the power transformer weight does not exceed the crane capacity. 

How Can I Estimate the Weight of a Transformer?

Move the transformer into its position on the foundation. Secure the power transformer by using the anchoring materials provided. You should bond the transformer to its dedicated safety grounding bar. 

If any damage to the transformer, use the paint provided by the vendor for touch-ups.  SAIC-P-3925 should inspect any transformer installation and assembly.  

How to Assemble a Transformer

Any inspections for damage or mechanical tests should be performed inside the transformer tank using any recommendations from the manufacturer. 

With nitrogen-blanketed transformers, positive pressure should be maintained. 

Accessories should be installed or assembled following the manufacturer's assembly drawings. 

Ensure the transformer is properly grounded per the project drawings. 

Wiring methods should meet the SAES-P-104 standards.

The insulation resistance tests should be performed on all control wirings. 

The insulation resistance tests should be performed between the core and ground.


If you need to lift heavy objects or machinery, we offer lifting equipment and lifting services for the construction and industrial industries.

Follow the links below to find out more about our specialist lifting services throughout the UK.