Preventive Maintenance
Preventive AMC is needed for safe & reliable operation of all transformers. It enables to detect problems at an early stage & can prevent further deterioration.

Preventive AMC includes the following tests:

  • Oil sampling + analysis (Oil quality, PCB, furan detection, moist level etc.)
  • Electrical measurements (Insulation resistance, winding resistance, Transformer Turn Ratios, SFRA-Sweep Frequency Response Analysis etc.)
  • Additionally, the accessories & protections are checked (Detection Gas Pressure Temperature, Buchholz, Thermometer & Fans) and silica gel is replaced, if needed.


Transformers are static devices that need low maintenance, but not free of maintenance. To determine the maintenance need of your transformer(s), Annual Maintenance Contract from Nakoda Products, offers an assessment that consists of visual inspections, oil sampling, thermography & electrical measurements. The evaluation is the foundation for a maintenance schedule in which the condition and priority of each transformer are decisive for the maintenance frequency & needs.

Our specialized team performs a thorough analysis of transformers working condition and choose to apply the best scheme for maintaining longevity and efficiency of the same.

Our AMC handles complete aspect of:

Onsite Maintenance
Following services are offered under the onsite repair activity:

  • Dehumidifying, degassing & filtering of oil.Top-up or replacing oil.
  • Replacing or repairing of accessories.
  • Replacing of bushings.
  • Repairing resin / removing corona.
  • Renewing of gaskets (all types).
  • Cleaning of contacts & adjusting torque.Maintenance of tank & conservator: corrosion removal, welding of leaks & repainting.
  • Site Acceptance Test with reporting.

Offsite Maintenance
These maintenance activities are comprehensively carried out in workshop site.

  • Full electrical test of transformer.
  • Repair of HV/LV windings.
  • Repair/renewal of damaged connections.
  • Re-clamping of the winding.
  • Repair of hair cracks & corona traces on cast resin transformers.Drying of active part.
  • Changing/repairing of tap changers & insulators.Full blasting & painting of reservoir.Factory Acceptance Test with reporting.