6-10 kV Oil-immrsed voltage transformers, НТМИ-1, НАМИ-1 types

6-10 kV Oil-immrsed voltage transformers, НТМИ-1, НАМИ-1 types

The transformers are designed for voltage measurement and may be connected to voltage meters and other devices that respond to the voltage, for example, the power meter voltage coils, electric meters, phase meters. Also they are usable for connection to automation, signaling and relay circuits. Applicable in AC 50Hz mains with voltage 6kV and 10kV with insulated neutral.
For accurate determination of your needs, please fill out the questionnaires NTMI.doc [38,5 Kb] (downloads: 20) NAMI.doc [40,5 Kb] (downloads: 7).


The transformer is performed as a group of three single-phase transformers, both connected to three-phase scheme in one common tank. It increases the repairability of the transformer and allows stable work in mains with ferroresonance phenomena.
Paper/carton insulating materials are excluded in the transformers, which improves its heat resistance.
The distinctive features of НАМИ-1 transformers are:
- their long-time operability at a high overvoltage (more than 3*Unom) that arose on any of the three phases due to ferroresonance phenomena in mains;
- weak errors dependence on the power load.
The proposed transformers applies technical solutions aimed at improving the dielectric strength and reliability of transformers.

НТМИ-6 НТМИ-10 НАМИ-6 НАМИ-10