Voltage transformers – VPA

These transformers are used to seperate measuring and protection equipment from high voltages and to transform the currents measured to the values required by the measuring and protection equipment.

These transformers are produced in compliance with IEC, VDE, ANSI, BS and other standards.

* Cores used in voltage transformers are made of quaity coled-rolled grain-oriented steel sheets. All cores used in transformers are thermally treated.
* Low and high voltage windings are designed as multilayer windings. The low voltage windings is wound on the respective frame. The high voltage winding is wound on the insulated low voltage winding. The conductors used for windings are made of electrical grade electrolytic copper, and the insulation is a high-quality synthetic resin. The inter-layer insulation is a polyster foil with insulating paper on its both sides.
* Main insulation of these instrument transformers is epoxy resin compound cast in high vacuum with superior dielectric and mechanical properties.
* Primary terminals are amde of brass and galvasined for corrosion protection. Connection to high-voltage terminals is amde by M10 tightening screws.
* Low voltage terminals are closed with appropriate cover, which is tightened to transformer body by means of special sealing screws. On the cover there are rubber cable glands for cables of 16 mm diameter. The terminal amrked with symbol must be properly earthed.
* The earthing screw (red marked) on the lower part of transformer has to be earthed.