Double Pole Single Phase Voltage Transformer DNT

Double Pole Single Phase Voltage Transformer DNT

Measuring voltage transformers DNT are designed to transmit 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 DNT series are designed for indoor installation.

According to the principle of operation, they are inductive, single-phase, two-pole, ungrounded. 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.

MAIN SPECIFICATIONS

  • Rated primary voltage from 3.3 to 42 kV
  • Rated secondary voltage 100.110, 120.220
  • 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

ADVANTAGES OF CAST RESIN VOLTAGE INSTRUMENT TRANSFORMERS

  • 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 DNT series were developed for operation at transformer substations, at traction substations of railways, at hard-to-reach facilities where equipment maintenance is not required, at enterprises with high pollution of electrical equipment. These transformers are widely used as auxiliary transformers (TSN) with a power of up to 5 kVA, for powering relay protection terminals, circuit breaker drives, disconnectors and other consumers.

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

Measuring voltage transformers DNT are a good alternative to obsolete and obsolete current transformers with oil insulation.