ELECTRICAL MEASUREMENT APPARATUS HAVING A DETECTOR PROVIDING AN IDENTIFICATION SIGNAL AND CORRESPONDING METHOD

摘要

A three-phase toroidal current transducer comprises a cuboid detector body 12, having three cylindrical passages 14 each for receiving a single-phase cable of a three-phase load (not shown). Each of the three passages 14 has an embedded toroidal winding (not shown) which is used to detect a current in the load cable (also not shown). Signals representing the current in each of the three individual load cables are sent to a meter (not shown), which may be located remotely. The signals are transmitted along a multi-core signal cable 16, which has a standard connector 18 for a plug-in connection to the meter. One of the wires in the multi-core signal cable 16 is connected to a component in the transducer 10 that identifies the rating of the transducer, so that the meter can determine this automatically when the signal cable is plugged in.