Current transformers – INA

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.

* transformers are made with 1:2 primary reconnection or without primary reconnection. Reconnection is very simple by re-arrangement of links at HV-terminals.
* Cores used in current transformers are made either of quality cold-rolled grain-oriented magnetic steel sheets or a high-quality soft magnetic material (Mumetal) depending on the required accuracy class.
* Low voltage winding, designed as multilayer winding, is wound on the core with additional insulation between layers.
* High voltage winding is designed in such a way, that mechanical stresses due to thermal dilatation in case of short circuit currents are not transmitted to the main insulation of the transformer. The conductors used for windings are made of electrolytic copper.
* Main insulation of these instrument transformers is epoxy-resin compound cast in high vacuum,with superior dielectric and mechanical properties.
* Primary terminals are made of copper or yellow brass.
* Secondary terminals are closed with an appropriate cover with rubber glands for connection cable of 16 mm diameter by means of special “sealing” screws. The terminal situated beside the secondary termianls and marked with symbol must be properly earthed. Secondary connections are connected by M5 screws.