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Oil-insulated Current Transformer up to 800 kV

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

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Oil-Insulated Voltage Transformers (VT) up to 420 kV

GE manufactures a complete range of high voltage oil-filled voltage transformers (VTs). The OTEF is a tank-type potential transformer with post insulator. Thousands voltage transformers are in service worldwide, in all types of climates and under the most severe conditions.

Customer Benefits

  • Extensive field experience
  • Operational security
  • Maintenance free
  • Protection against bursting
  • Easy installation – no special tools required
  • Leak proof design and rugged construction for long service life
  • Mineral oil-filled - no PCB
  • Insulation paper applied mechanically which guarantees a homogeneous, high-density paper insulation
  • Seismic design (for 420 kV networks, lower gravity center than competitors)


  • 72.5 to 420 kV
  • Up to 5,000 A
  • In short-circuit: up to 80 kA1” (Isc dyn: 200 - kA peak)
  • Secondary cores: up to 8
  • Oil expansion by stainless-steel bellows
  • Oil level indicator
  • Compliance with IEC and IEEE or equivalent standards
  • DC current transformers available