Miniature Substations

Miniature Substation Design and Manufacture

Free State Transformers is an established designer and manufacturer of industry leading, durable miniature substations. These quality products are manufactured to our strict SANS 780 manufacturing standards.  Our ISO 9001:2015 certification underlines the quality of all our products.

Miniature Substations up to 2 MVA!

Free State Transformers manufactures miniature substations (minisubs) up to 2 MVA with voltages of 11 kV, 22 kV and 33 kV. Our minisubs incorporate medium voltage switchgear with either SF6, oil or vacuum insulation.

Speak to our friendly, expert sales team today to discuss your needs for Free State Transformers Miniature Substations!

Miniature Substation Range

Our quality miniature substation range includes:

  • Surface mount minisubs for municipal or industrial application
  • Underground mobile minisubs for the mining industry
  • Skid based minisubs for open cast mines

What is a Miniature Substation

A substation is a part of an electrical generation, transmission, and distribution system. Substations transform voltage from high to low – or the reverse – or perform any of several other important functions. Between the generating station and consumer, electric power may flow through several substations at different voltage levels. A substation may include transformers to change voltage levels between high transmission voltages and lower distribution voltages, or at the interconnection of two different transmission voltages.

Substations can be owned and operated by an electrical utility, or  a large industrial or commercial customer. Generally substations are unattended, relying on a control system for remote supervision and control.

We Are The Miniature Substation Experts!