Measuring current levels in three=phase rectifier circuits - using current transformers in input leads and Graetz bridge circuit

摘要

A circuit determining the actual current value in rectifier circuits (1) for three-phase systems contains current transformers (2) with primary windings having a.c. input leads. The secondary windings are connected- via a rectifier contg. at least one diode - to a load resitor (3) common to the transformers. The secondary windings have an additional high impedance load resistor connected across them and in parallel to a pat of the rectifier in the form of a Graetz circuit (4).