New Transformers

We have agreements with major transformer manufacturers for the manufacturing of new transformers and they have a capacity of manufacturing the following:

Distribution Transformers:

  • Custom Designed Oil Filled Transformers
  • Distribution 100 kVA to 3 150 kVA
  • Windings options: Copper or Aluminium

Locally manufactured Power:

  • 3 150 kVA to 100 MVA 132 kV
  • 50 MVA 550 MVA to order from WEG Brazil

All distribution and power transformers are manufactured to SANS 780, BS 171, and IEC 159 specifications under ISO: 9001 quality standards.


We supply the following:

  • Enclosure Type A, B and C
  • Up to and including 2 000 kVA
  • Customised units up to 33 kV for the African market
  • 6mm standard high-risk vandal-proof Eskom approved minisubs

Transformer Maintenance & Repairs

We offer the following transformer maintenance services on site:

  • Oil sampling – In-line with the client’s requirements. We have qualified staff to take samples and we make use of Wearcheck and Eskom Laboratories for analysis.
  • Oil results analysis – we offer an interpretation of oil results in line with IEC specifications. We also offer trending of oil results services to our clients offering a dashboard view of the Grid transformers health.
  • Oil purification (Based on oil results) – we have a mobile oil purification plant, 5000 litres/hour
  • Repair of oil leaks.
  • Re-spraying of the transformer.
  • Mid-year and annual transformer maintenance
  • Transformer Testing – we offer on-site and off-site transformer testing services.

Transformer Testing Types:

  • Winding resistance test of transformer
  • Transformer ratio test
  • Transformer vector group test
  • Measurement of no-load loss and current (Open circuit test)
  • Measurement of insulation resistance
  • Dielectric tests
  • Tests on on-load tap-changer

We repair all types of transformers, i.e. air-cooled, dry type, Cast Resin impregnated, etc
We repair the following on-site and off-site:

  • Autotransformers
  • Current transformers
  • Distribution transformers
  • Power transformers
  • Transformers for rectification
  • Auto Korndorfer transformers
  • CLR’s (Current limiting reactors)
  • NER (Neutral earthing resistor)
  • NEC (Neutral earthing compensators)
  • NER / NEC / AUX
  • Resistors
  • DC Chokes (air-cooled, water-cooled, oil-cooled)
  • Magnetics
  • Recti formers
  • Reactors
  • Motor Starting Reactors
  • Epoxy impregnated toroidal transformers
  • Mini Subs


  • We are SABS ISO 9001 Certified, and we continue to maintain the quality management system
  • We are CERTEX approved
  • We have a flameproof certification which covers the relevant requirements of SANS 600079-1/14; SANS 10086-1; SANS 10208


Winding Technologies Partners


Africa Wide Logo
Anglo American Logo
EPC Logo Logo
Eskom Logo
Prasa Logo
Royal Bafokeng Logo Logo