Measuring voltage transformers NMT are designed to convert the high voltage of the contact network with a rated voltage of the primary winding of 25 kV, 50 Hz AC and 3 kV DC, into a low, galvanically isolated voltage for supplying metering, protection and signaling devices, for measuring the magnitude of the voltage of the contact network electric locomotive control system and traction converters.
Measuring voltage transformers NMT are designed for installation on the roof of electric locomotives, so they can work in conditions of vibration, high overloads, as well as sudden changes in temperature and climatic zones.
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 20 years without any maintenance.
ADVANTAGES OF CAST RESIN VOLTAGE INSTRUMENT TRANSFORMERS
Transformers meet the requirements of IEC, ANSI, IEEE, GOST standards.