Single Pole Indoor Voltage Transformer JNT

Measuring voltage transformers JNT are intended for transmission of measurement information signals to measuring instruments, protective devices, automation, signaling and control in voltage networks from 3.3 to 42 kV AC, industrial frequency 50 or 60 Hz.

Measuring voltage transformers (VT) of the JNT series are designed for indoor installation.

According to the principle of operation, they are inductive, single-phase, single-pole, grounded. Voltage transformers (VT) have a cast housing made on the basis of an epoxy compound. The insulation material of voltage transformers has excellent arc, ozone and ultraviolet protection characteristics, while it has high mechanical strength, so that the transformers can work for more than 30 years without any maintenance.

Additionally, measuring voltage transformers, at the request of the customer, can be equipped with a ferroresonance protection device.


  • Rated primary voltage from 3.3 to 42 kV
  • Rated secondary voltage 100,100/√3,110,110/√3,120,120/√3
  • Number of secondary windings up to 3
  • Winding accuracy class for measurement 0.2; 0.5
  • Winding accuracy class for protection 3P;
  • Voltage factor 1.5 or 1.9
  • Ambient conditions: temperature from -45° to +55°
  • Compliance with IEC and IEEE standards or equivalent standards


  • Lack of any maintenance throughout the entire period of operation
  • Fire and explosion-proof design
  • Possibility of installation in any plane
  • High loads for all accuracy classes
  • Low partial discharge (PD)
  • Resistance to aggressive environmental conditions
  • The hydrophobic material exhibits excellent outdoor performance and also minimizes the possibility of arcing.
  • No ozone depleting gases

Voltage transformers (VT) of the JNT series were developed for operation in complete switchgear, transformer substations, at traction substations of railways, as part of complete switchgears of traction substations, at hard-to-reach facilities where equipment maintenance is not required, at enterprises with high pollution. .

Transformers meet the requirements of IEC, ANSI, IEEE, GOST standards.

It is possible to manufacture a three-phase assembly on a common frame.

JNT voltage measuring transformers are a good alternative to obsolete and obsolete oil-insulated current transformers.