5 FAQs about Distribution Transformers

    1. What do distribution transformers do?


Distribution transformers are the last port of call on a distribution grid. The grid will soak up high amounts of electrical energy and distribute it accordingly for the customer, be it household or commercial use.

The distribution transformer is responsible for outputting the correct voltage. It converts the voltage from the transmission lines and delivers it for domestic or industrial usage.


    2. How does a distribution transformer work?

Due to the fact that a distribution transformer has no moving parts, the concept of how it works is fairly simple…

The main body of the transformer houses two or more coils of insulated wires wound on a steel core. As soon as voltage is introduced to one of the coils (Primary/Input Coil), the core magnatises. As a result, voltage transfers into the other coil (Secondary/Output Coil). It’s down to the turn ratio of the two coils to determine the change in voltage levels and final distribution.


    3. Why do we use distribution transformers?

As we know, distribution transformers are used for the correct distribution of electrical energy to the necessary consumer.

Typically, distribution transformers are needed to manage the voltage output (often at a low level). For instance, industrial purposes may require a low voltage of less than 33KV whilst more domestic users only need between 220v-440v.

Not only do distribution transformers help to distribute the correct levels of energy but they combat energy waste and core losses too – critical for today’s climate.  


    4. What makes distribution transformers effective?

Efficiency and simplicity are key two factors in a distribution transformer’s performance.

For obvious, global reasons, modern distribution transformers are designed with efficiency in mind. Interestingly, because a distribution transformer is always ‘online’ and operates at loads less than full load, they are designed to reduce core losses by operating for maximum efficiency around 60-70%. The ability to handle clusters of loads, reduces thermal energy waste too. Having said that, older transformers are not as savvy and may need to be updated.

Additionally, although distribution transformers are bulky and weighty, they are not excessive in size. This means most installs are swift and they can be placed almost anywhere, as long as it’s not over a great distance so that the voltage drops.


    5. Where are distribution transformers installed?

Depending on the type of distribution transformer, they can be squeezed in to the tightest of spaces; generally, you’ll find them in open and expansive spaces on solar or wind farms, for example. Generally, you will see two different types of distribution transformer: pole mounted (if transmission lines run above ground) and pad mounted (transmission lines underground).


Distribution transformers at Wilson Power Solutions

At Wilson Power Solutions, we design, manufacture and supply a comprehensive range of cold rolled grain oriented (CRGO) double wound distribution transformers that can be supplied both liquid filled (Oil or Synthetic Ester e.g. Midel) or dry type (Cast Resin).

Our Wilson e1 transformer range provides cost effective, fully EU Eco design compliant distribution transformers, making it the perfect choice for budget sensitive projects.

What’s more is that our transformers are designed to comply with and satisfy the high demands of modern distribution networks. They are manufactured in accordance with internationally recognised standards (BS, IEC and ANSI) and comply with the EU Eco Design Directive for transformers.

We also offer delivery on our stock transformers, ready for next day or 48 hour express deliveries. These include the Wilson E1 range (Eco Design Tier 1 compliant, liquid filled distribution transformers) with the following ratings:

  • 315kVA


To accompany your distribution transformer, we also have a range of accessories:

  • Typical accessories
    Oil temperature indicator (OTI)
    Winding temperature indicator (WTI)
    Magnetic oil level gauge (MOG)
    Forced fan cooling
    Marshalling box P
    Pressure relief device (PRD)
    AVR relay and control panel
    Bi-directional rollers
    Radiator valves
    Dehydrating breather

For any further information about our distribution transformers or other services, please get in touch.

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