Power Transformer Repairs

ArmCoil’s power transformer repair services are performed at our Roodepoort facility in Johannesburg, South Africa.

Our power transformer 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, IEC, TRANSNET & ESKOM repair specifications for power transformers. We offer our repair services on the following all types of power transformers such as ONAN & ONAF.

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

The power transformer repair services capabilities are: (but not limited to)

  • Full electrical and mechanical condition assessment and repair recommendations.
  • Full rewinding on all types of distribution transformers up to 88kV (88000V).
  • 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 Temperature Stabilising Testing.
  • Efficiency comparison testing.
  • Oil sampling, testing and reporting in accordance to SANS555.
  • Ratio testing.
  • SFRA testing.
  • Power transformer core repairs and replacement services.
  • Cooling upgrades and redesign.
  • Protection evaluation and upgrade services.
  • Bushing servicing, refurbishment and replacement.
  • Sandblasting and respray facility.
  • Mechanical repairs and upgrade of power 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.
  • OLTC replacement modifications.
  • OLTC servicing, refurbishment and replacement services.
  • Mechanical design and manufacturing of power transformer for upgrade purposes.
  • Factory acceptance testing services (FAT) on power transformers.
  • OEM assembly and testing of power transformers.