Wilson Power Transformers installed at a substation

Products
Power Transformers

High Voltage Power Transformers

Power Transformers

High Voltage Power Transformers

We design, manufacture, and supply bespoke two- and three-winding Power Transformers. Available ratings are up to 300MVA, and Autotransformers up to 500MVA, with voltage levels of 400kV, 275kV, 132kV, 66kV, and 33kV (non-standard voltages are available). Our Power Transformers, including Extra High Voltage (EHV) transformers, are built to comply with Ecodesign Tier 2 regulations or Tier 1 if it is a concession case.

Our bespoke designs are built according to site requirements and are available liquid-filled, conforming to IEC, BS, and other International Standards. Wilson Power Transformers come with an industry-leading 24-month warranty from dispatch, with an extended warranty option available upon request.

DNO Specifications

DNO Compliant Power Transformers

We have expanded our supply to offer Power Transformers that are compliant with DNO design languages. This complements our offer of Power Transformers for the private industry and Wilson d2 DNO-approved distribution transformers for iDNOs and ICPs.

We have a number of designs up to 120MVA with 33kV, 66kV, and 132kV high voltages. Offering ONAN/ONAF/CER cooling methods makes iDNO Power Transformers suitable for load-balancing applications when one transformer can accommodate the full site load in cases of failure or scheduled maintenance. Transformers are offered with an on-load tap changer and ancillaries. Get in touch to discuss your project requirements with our team.

UKPN Wilson Power Transformers at Ironbridge

Features & Benefits

Bespoke designs, reliably built

Up to 300MVA and 400kV

Competitive lead times

Custom specification, design and manufacture

Bespoke delivery solutions

emergency rating and fan forced cooling options icon

Continuous emergency rating and fan forced cooling options

Tank-mounted cooling radiator panels icon

Tank-mounted cooling radiator panels or separate cooling banks

Site Acceptance Test & Factory Acceptance Test

Auxiliary and earthing transformers

Dedicated project managers and site engineers

24-month warranty from dispatch

Manufactured to internationally recognised standards

Site Services

Expert Installation & Service Engineers

A range of offloading techniques & equipment
- Jack and skid
- Crane installation
- Temporary or fixed scaffolding
Transformer assembly
- Radiator installation
- Conservator installation
- Oil filling and filtration
- Marshalling and cabling
Warranty repairs & after-sales
Transformer upgrades
On-site testing (pre-commissioning) including instruments
Site Acceptance Test (SAT)
Transformer inspection including oil sampling

ETX at 33kV

Earthing Transformers

Also known as zig-zag transformers due to their vector grouping, earthing transformers create a neutral point for the power system by providing a path to the ground or earth for fault currents. In the event of a fault in normal operating conditions, such as a short circuit, the earthing transformer allows the fault current to flow to the ground. This protects the equipment, mitigating potential hazards such as electrical shocks or fires and limits the magnitude of transient overvoltages by providing a low impedance path to the ground.

Product Specifications:

Short Time Current Rating and Duration
- Maximum Current: 1500 amps
- Duration: 10 seconds
Vector Group: ZN or any other vector group as per IEC 60076

AET up to 500kVA

Earthing Transformers with Auxiliary Loads

Our combined Earthing and Auxiliary Transformers are designed to integrate the functions of both Earthing and Auxiliary Transformers into a single unit. This provides the system with safety, stability and efficiency, establishing a ground reference for the electrical system while facilitating the connection between site equipment (lighting, CCTV, etc.) and the electrical grid. This also streamlines the installation process whilst minimising space.

Typical Product Specifications:

Primary Voltage Levels: 33kV or bespoke
Secondary Voltage Levels: 415V or 433V
Short Time Current Rating and Duration:
- Maximum Current: 1500 amps
- Duration: 10 seconds
Vector Group: ZNyn1 or ZNyn11 or any other vector group as per IEC 60076

AUX up to 4500kVA for dual winding

Auxiliary Transformers

Auxiliary transformers typically step down or up the voltage to a safer level suitable to power plant auxiliary loads and equipment on site, such as lighting, CCTV, and fire systems. They also help isolate the control circuits from higher voltages in the main power system, ensuring the site facilities' safety and proper functioning. Our auxiliary transformers are designed bespoke to your needs and installed where necessary as part of your power transformer assembly.

Typical Product Specifications: