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Voltage Transformer TVI (72.5 - 420 kV)

Gas-insulated instrument transformer for enhanced safety and reliability

TVI is a SF6 gas-insulated Inductive Voltage Transformer built for revenue metering and protection in high voltage networks. The TVI has been designed for voltage up to 420 kV.

  • Suitable for both metering and protection 
  • Magnetic cores made of laminated steel with oriented grain and a high level of permeability
  • Windings made of electrolytic copper
  • Safety margin for normal wind loads, stress from conductors and seismic forces
  • Remote control of the internal insulation level by means of pressure gauge provided with an alarm threshold and lock threshold
  • A pressure relief device protects the apparatus from internal overpressure


  • Revenue metering 
  • Protective relaying
  • System control and indication of power flow

Why Hitachi Energy?

The TVI, thanks to the use of SF6 gas and of a composite insulator, offers several advantages:

  • Explosion proof design
  • Available with a gas-insulated disconnector for increased flexibility during operation
  • Absence of partial discharge
  • Dielectric mean not subjected to aging
  • Higher performance in very heavy polluted environments
  • Maintenance free
  • Life cycle of 30 years

Brief performance data

Installation Outdoor
Design Self-standing lower core
Insulation SF6 gas
Highest voltage for equipment 72.5 - 420 kV
Power frequency withstand voltage Up to 630 kV
Lightning impulse withstand voltage Up to 1.425 kV
Insulators Composite
Ambient temperature -50 ºC to +40 ºC (Standard)
Pollution level IV (Very Heavy)
Accuracy Meets all IEC and IEEE metering and protection classes

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