MEASURING CONVERTER OF NEGATIVE SEQUENCE CURRENT Russian patent published in 2011 - IPC G01R29/16 

FIELD: electricity.

SUBSTANCE: device comprises a negative sequence voltage filter, which represents a resistor-capacitor circuit, connected to the first, second and third input terminals, and also to the first and second output terminals of this filter, to which a load of the specified measuring converter is also connected, at the same time between the first input and the first output terminals of this filter there is the first capacitor connected, between the first output and the second input terminals of the filter there is the first resistor, between the second input and the second output terminals of the filter there is the second capacitor, and between the second output and the third input terminals there is the second resistor, besides, at the rated value of frequency of a three-phase circuit, to which the specified measuring converter is connected, and whenever the load is disconnected from the output terminals of the filter, the current of a section in the resistor-capacitor circuit connected between the first and second input terminals of the filter advances a sinusoidal electromotive force of a source connected between these terminals by π/6.

EFFECT: improved selectivity and device simplification.

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