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Oil-insulated Current Transformer up to 550 kV

Grid Solutions > HV/MV Equipment > Instrument Transformers > KOTEF

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Oil-Insulated Combined CT/VT up to 420 kV

KOTEF utilizes the same components as the individual CTs and VTs. Both transformers are combined in a single metering unit and are available in porcelain or composite. The KOTEF combines the advantages and design features of the OSKF and OTEF lines.

Customer Benefits

  • Excellent solution for adding metering capability to either a new substation installation or a site being upgraded where space is at a premium
  • Price advantage
  • Space saving - only one base
  • Cost savings on transportation and assembly
  • Maintenance free
  • Protection against bursting


  • 72.5 to 420 kV
  • Oil expansion by stainless-steel diaphragm bellows
  • Oil level indicator
  • Secondary cores in aluminum box
  • Changing of primary ratio by primary series-parallel connection (double or triple ratio) or by secondary taps
  • Compliance with IEC and IEEE or equivalent standards
  • Paper oil insulation