Escolha sua região e idioma



Inductive Voltage Transformer Type UT

Outdoor inductive voltage transformer with oil-filled stainless steel bellows and paint-free housings

UT 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 UT to withstand continuous 110 percent rated voltage continuously, and provide 190% overvoltage rating for 8 hours.  Hermetic sealing of the design is accomplished using stainless steel bellows above the oil to prevent free-breathing outside moisture-laden air.

The distributed gap core design offers low losses and ensures the unit has a relative high accuracy burden rating of 400 VA (ZZ).


  • Revenue metering
  • Control
  • Indication
  • Relay protection

Why Hitachi Energy?

The UT is a very capable inductive voltage transformer for withstanding extremem conditions with an excellent service record.  The standard design has a porcelain insulator with silicone rubber insulators available as an option, providing even better performance in heavily polluted environments.  ABB offers our users unique advantages as follows:

  • 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
  • Three secondary tapped windings

Brief performance data

Installation Outdoor
Design Inductive type
Insulation Oil-paper
Highest voltage for equipment 145 - 525 kV
Voltage factor (Vf) Up to 1.9-8hrs 
Insulators Porcelain (standard)
Silicon rubber (by request)
Creepage distance ≥ 25 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
power plant engineer for substation
Contact us

Submit your enquiry and we will contact you