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Inductive Voltage Transformer POF (48 - 123 kV)

Dependable accuracy over high burden range

POF inductive voltage transformers are of single-phase design and intended for connection between phase and ground in networks with insulated or direct-grounded neutral points..

The extremely low core flux density enables the POF to withstand continuous 100 percent rated voltage continuously, and provide either 173 percent over voltage for 1 minute (POF-550) or 190 percent for 8 hourse (POF-350 and lower).  Hermetic sealing of the design is accomplished using a gas cushion above the oil to prevent free-breathing outside moisture-laden air.


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

Why Hitachi Energy?

  • The POF is a very capable inductive voltage transformer for withstanding extreme conditions and features an excellent service record.
  • The 72 kV and lower units use a cycloaliphatic epoxy bushing to minimize oil content, reduce center of gravity for better seismic withstand and provide extra strike and creepage distance in the standard design.
  • For 123 kV, the standard is a porcelain insulator with silicone rubber insulators available as an option, providing even better performance in heavily polluted environments. 
  • The distributed gap core design offers low losses and ensures the unit has a relative high accuracy burden rating of 400 VA (ZZ).
  • Excellent application engineering support ensures optimal solutions for your project
  • Designed for environmentally diverse conditions - polar to desert
  • Low loss distributed gap core ensures the best accuracy performance with the lowest core losses for the duration of service life

Brief performance data

Installation Outdoor
Design Inductive type
Insulation Oil-paper
Highest voltage for equipment 48 - 123 kV
Voltage factor (Vf) Up to 1.9-8hrs
Insulators 72 kV and lower:  Cycloaliphatic epoxy
115 kV:  Porcelain as standard, silicon rubber (SIR) by request
Creepage distance ≥ 20 mm/kV (longer by request)
Service condition  
  • Ambient temperature
-40ºC to +40ºC (standard)
  • Design altitude
Maximum 1000 m (standard)
  *Other temperatures and altitudes are possible
Accuracy Meets all IEC and IEEE metering and protection classes

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