12 kV Bar Primary Current Transformer

The primary bar is made from a high conductivity flat copper bar of cross section appropriate to the required current rating. The copper bar is contained in a synthetic resin bonded paper tube, which is filled with epoxy resin. The ring CT itself is designed to cover BS3938, BS7626, IEC185 and BSEN 60044-1, and is manufactured according to the long established methods used over many years by ARW in supplying CTs to the Supply Authorities and Industry users. The finish is either cotton tape dipped in varnish or black PVC tape, depending on whether the CT will be used in oil or air. The secondary current is normally 5 Amps, but other secondary currents can be supplied. Class and accuracy are typically 0.5 or 1.0 for metering and 5P10 for protection.

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