Our technical team can help to design, modify and reverse engineer to your specification.

R Baker (Electrical) Ltd manufacture custom made test transformers for a range of applications. Our range of transformers are utilised for research and test application. We have ongoing projects with testing facilities and universities to create unique solutions.
Our range of test transformers cover everything from 500VA up to 250kVA. We are an independent British company who are here to assist you with design, reverse engineering and manufacturing of test transformers.

Our testing transformer range

Our team has over 35 years of transformer design experience for testing and research applications. We have a transformer design department which are at the forefront of innovation. Furthermore, all of our transformers are custom made solutions to meet the unique specifications.

We have the knowledge to be able to assist you even when other companies can not help. No matter how unique your testing application is, we offer short lead-times and competitive pricing.

Our custom built test transformer range is designed for commercial, educational and research applications.

Transformer range

Our transformers can be built for a wide range of environments and solutions. Have a look below at the wide selection of ways we can meet your needs:

  • Current transformers
  • Auto transformers
  • Isolation transformers
  • Earthing transformers
  • Bushing transformers
  • Custom built transformers
  • Air cooled transformers
  • Air cooled transformers
  • Liquid cooled transformers (oil immersed)
  • Harmonic current reduction transformers
  • Step up and step down transformers
  • Delta/Star, Interconnected Star transformers
  • Auto wound, phase shifted scott & tapped delta transformers
  • Marine / offshore transformers
  • Transformer-rectifier units for D.C. power supplies
  • Military transformers / NSN / NATO transformers
  • Zone 1 and Zone 2 (Exd) hazardous areas transformers
  • Transformer maintenance programmes

Test Transformer Design

Power Transformers

Specifying transformers is not always an easy task for unique applications. There are many variations when designing transformers for specific applications. Over the last 35 years our team has manufactured thousands of transformers which vary in application. This has given us a great deal of experience when designing test transformers. We have worked with the leading universities in the UK to design unique testing and research applications.  

Our team understand that most university projects require a complex problem to be solved, so our team can offer free advice from design through to production. For research and test applications our design team can provide full design data and drawings to aid the design process. When designing a transformer there are many elements to consider. The correct choice of lamination, transformer connections and transformer size and heat restrictions. This is to name just a few.

Our test transformers all conform to BS EN61558 and EN 60076 standards. Also, our procedures and quality controls are independently monitored to BS EN ISO 9001:2000

Case studies

8000A Transformer

To manufacture an open style transformer designed to offer the customer 8000A at 9 volts. Our design team were required to design the transformer to be built on a moveable unit which would allow the operator the facility to move the transformer into place when testing equipment.

72kVA Testing transformer

We were tasked by a motor manufacturer to design a test unit which required our team to design a system with a 72kVA transformer and a drive to offer the facility for the operator to change the voltage, current and frequency. The unit was designed and manufactured within a stainless steel enclosure with a user control panel to offer ease of use.

10.5kW Transformer

Our engineering team were tasked to design a 10.5KW enclosed transformer, with the ability to vary the voltage manually. The customer required the facility to test their equipment at different set voltages for different periods of time. The transformer was designed so the user could easily connect the transformer to their equipment through a bus bar system.