ArmCoil’s distribution transformer and miniature substation repair services are performed at our Roodepoort facility in Johannesburg, South Africa.

Distribution Transformer and Substation Repairs

Our repair services facility is accredited and managed in accordance with our ISO9001:2015 and ISO14001:2004 quality and environment systems.

ArmCoil complies to all SANS780 repair specifications for distribution transformers and mini-substations. We offer our repair services on all types of equipment such as ONAN, ONAF and Dry Types.

ArmCoil’s work area is 6700 m2 under roof, which is equipped with a maximum 50 tonne overhead remote crane among others and lifting equipment. The facility and its content are insured together with 24 hour security.

Distribution Transformer and Substation Repairs

The distribution transformer and mini-substation repair services capabilities include:

  • Full electrical and mechanical condition assessment and repair recommendations.
  • Full rewinding on all types of distribution transformers up to 33kV (33000V).
  • Localised coil and supply lead repair services available where possible.
  • Time and Temperature Controlled Curing Oven facilities.
  • Complete Test Bay Facility including all calibrated testing equipment which includes:
    • No Load Testing or routine testing.
    • Load Testing.
    • Complete distribution transformer and mini-substation Temperature Stabilising Testing.
    • Efficiency comparison testing.
    • Oil sampling and testing in accordance to SANS555.
    • Full voltage testing.
    • Ratio testing.
    • SFRA testing.
    • LV, MV equipment testing including lighting compartment.
  • Distribution transformer and mini-substation core repairs and replacement services.
  • RMU refurbishment or replacement
  • Cooling upgrades and redesign.
  • Sandblasting and respray facility.
  • Mechanical repairs and upgrade of distribution transformer.
  • Radiator replacement and repairs.
  • Conservator replacement and repairs.
  • Main tank replacement and repairs.
  • LV & HV Box replacement and repairs.
  • All type of auxiliary parts replacement and servicing.
  • Transformer pressure testing for leaks.
  • Mechanical design and manufacturing of distribution transformer for upgrade purposes.
  • Factory acceptance testing services (FAT) on distribution transformers.
  • OEM assembly and testing of distribution transformers.
Distribution Transformer and Substation Repairs