Transformer Services

MOKO’ teams travel across the country safely installing, assembling, vacuum-filling and commissioning substation, power and GSU transformers with ratings and voltage as large as 500 MVA and 400kV respectively.

Assembly, installation & commissioning

  • On-site transformer installation and component assembly.

  • Vacuum processing removes moisture and air.

  • Oil is heated, dehydrated, degassed, and circulated into the transformer.

Transformer Electrical Testing

  • Advanced equipment and software provide accurate data capture, transfer, and reporting.

  • Tests include TTR, insulation resistance, winding resistance, CT ratio, power factor, excitation, and SFRA.

  • Additional testing available on request.

Oil reclamation & processing

  • Removes acid, water, dissolved gases, sludge, and insulation-degrading byproducts.

  • Oil is heated and circulated through filters, fuller’s earth tanks, and vacuum dehydration systems.

  • Extends transformer and insulation life.

Oil sampling & testing

  • Identifies contaminants, moisture, acid, PCB, and dissolved gases before failure occurs.

  • Tests include dielectric breakdown, moisture, winding resistance, PCB, DGA, and more.

  • Testing guide available.

Field services & repairs

  • Warranty repairs, inspections, regasketing, welding, bushing and radiator replacement, load-tap-changer work, and transformer retrofits.

  • Weekend and holiday crews help minimize downtime.