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Transformers

Transformers are electrical devices that transfer electrical energy between two or more circuits through electromagnetic induction. They consist of two or more coils of insulated wire wound around a laminated steel core, with the primary winding receiving alternating current and the secondary winding delivering the transformed voltage. Transformers operate on the principle that a changing magnetic field in one coil induces a voltage in another coil, allowing voltage to be stepped up or stepped down depending on the turns ratio between the windings. They are essential components in electrical power distribution systems, enabling efficient transmission of electricity over long distances at high voltages and then stepping down the voltage for safe use in homes, businesses and industrial facilities. In mining and industrial applications, transformers provide the specific voltage levels required for heavy machinery, processing equipment and underground operations. They range in size from small distribution transformers serving individual buildings to large power transformers at substations handling hundreds of megavolt-amperes. Key specifications include voltage ratio, power rating, cooling method (oil-immersed or dry-type), impedance and efficiency. Transformers are manufactured to international standards such as IEC and IEEE, with specialised designs for harsh environments including high altitude, extreme temperatures and corrosive conditions. The technology has remained fundamentally unchanged since its invention in the late nineteenth century, though materials, insulation systems and monitoring capabilities have advanced significantly.

Transformers Updates


A 1250 kVA dry-type mini-substation designed for reliable power distribution in demanding underground mining applications
How to Tell Whether Your Mini-Substation Is Truly New or Refurbished
9th June 2026

As demand grows for reliable electrical infrastructure across mining, industrial and commercial projects, mini-substations are increasingly being installed to support new developments, expansions... 


NTCSA, IDC seek to catalyse localisation on back of big grid roll-out
NTCSA, IDC seek to catalyse localisation on back of big grid roll-out
4th May 2026 By: Terence Creamer

The National Transmission Company South Africa (NTCSA) and the Industrial Development Corporation (IDC) have signed a memorandum of understanding aimed at unlocking industrial financing to... 


LH Marthinusen nears completion of two 30 MVA transformers for a mining house in Botswana
LH Marthinusen nears completion of two 30 MVA transformers for a mining house in Botswana
9th April 2026

(Virtual Showroom) LH Marthinusen (LHM), a division of ACTOM and one of the largest global operations offering a comprehensive suite of on- and off-site electro-mechanical repair and manufacturing... 


David Claassen, Managing Director of Trafo Power Solutions, continues to drive the company’s growth in supplying customised dry-type transformer solutions
Trafo Power Solutions delivers future-ready electrical infrastructure for evolving mine needs
2nd March 2026

The ability to design and scale electrical infrastructure for mines’ changing needs has become a critical competitive advantage for Trafo Power Solutions, allowing customers to avoid costly... 


WEG Africa Sales & Marketing Executive Director Rodrigo Cetenareski talks to Engineering News & Mining Weekly at Investing in African Mining Indaba in Cape Town.
Electric motor manufacturer highlights range of products for global client base
9th February 2026 By: Creamer Media Reporter

Global solutions provider of industrial electrical technologies WEG was founded in 1961 and has grown into one of the largest electric motor manufacturers in the world, producing more than... 


Hansen + Genwest head of sales Bhavesh Parbhoo talks to Mining Weekly ahead of the Investing in African Mining Indaba in Cape Town.
Hansen + Genwest powering mining and industry through 50 yrs of engineering excellence
9th February 2026

Reliable electrical infrastructure remains fundamental to the performance and safety of mining and heavy industrial operations. These issues were in focus when transformer and switchgear... 


Trafo Power Solutions
Trafo Power Solutions evolves to offer range of electrical power solutions
6th February 2026

Having rapidly carved a niche in dry-type transformer applications in Africa, Trafo Power Solutions has steadily grown its offerings – and now sees a future as a leading provider of electrical... 


Hansen + Genwest
Hansen + Genwest provides power you can trust
30th January 2026

For 50 years, transformers and switchgear manufacturers Hansen + Genwest has powered South Africa’s industries with reliable, proudly locally manufactured electrical solutions. From its base in... 


ACTOM triples transformer manufacturing capacity with new sites
ACTOM triples transformer manufacturing capacity with new sites
28th January 2026

Following its acquisition of SGB-SMIT Power Matla as part of a business rescue process, electromechanical equipment manufacturer ACTOM has started transformer production and testing activity at a... 


Data centres can’t afford downtime-here’s why transformer reliability matters
Data centres can’t afford downtime-here’s why transformer reliability matters
4th November 2025

By: Mawethu Ngubo - T&D Business Development Specialist at ACTOM T&D  Data centres are the backbone of modern business and government operations. Because every transaction, every file and every... 


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