METHOD FOR MEASUREMENT OF CURRENT IN BRUSHES OF BRUSH-CONTACT APPARATUS IN SYNCHRONOUS GENERATORS Russian patent published in 2010 - IPC G01R31/34 

FIELD: measurement equipment.

SUBSTANCE: method is characterised by application of contactless current sensor in the form of opened magnetic conductor with magnetic sensitive element, which is arranged in magnetic conductor gap. Current sensor signal is sent to analog-digital transducer. Minimum frequency of digitisation F_D in process of brush current measurement makes

where f_r is frequency of synchronous generator rotor rotation, D_c is diametre of contact ring, a is size of brush in direction of contact ring rotation (along tangent). Brush current values measured with frequency of digitisation are summed for a period of time, which is even to one rotation of generator rotor shaft. Obtained sum is divided into overall number of measurements. Then difference is found between produced average value of current and value of each measurement. Absolute difference values are summed up, and produced sum is divided into number of measurements to obtain value of average deviation.

EFFECT: provision of possibility to measure value of brushes current and average deviation, which characterises stability of current in sliding contact of brush.

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