Current transformers – APE

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.

* The 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 high-quality soft magnetic material (Mumetal) depending on the required accuracy class.
* Low voltage winding is uniformly distributed around the circular core.
* 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 an epoxy compound based on cycloaliphatic resin for outdoor installation, cast in high vacuum and with superior dielectric and mechanical properties.
* Primary terminals are made of copper or yellow brass and corrosion protected by galvanic nickel plating.
* Secondary terminals are made of stainless steel screw M8 (inox) and are placed inside the terminal box. The terminal marked with symbol must be properly earthed. Terminal boxes is equipped with cable gland for cable of 16 mm diameter.
* The earthing screw (red marked) on the lower part of transformer has to be earthed.