APPARATUS FOR MONITORING PARTIAL DISCHARGES Russian patent published in 2014 - IPC G01R31/12 

FIELD: electricity.

SUBSTANCE: method involves determining the lower trigger threshold and the upper trigger threshold, determining duration of a shorter time interval, monitoring at least one phase of the electrical system in order to detect a pulse over the duration of the shorter time interval, determining maximum amplitude arising in the electrical system over the duration of the shorter time interval, determining if the measured maximum amplitude of the pulse exceeds the lower trigger threshold and the upper trigger threshold, assigning the pulse a pulsation coefficient if the maximum amplitude of the pulse exceeds the lower trigger threshold and the upper trigger threshold, recording the pulse or information relating to said pulse if the pulsation coefficient corresponding to the pulse is less than a predetermined threshold pulsation coefficient in the shorter time interval, applying time shift of a movable trigger such that: if the pulse exceeds the lower trigger threshold but not the upper trigger threshold, and the pulsation coefficient is equal to a predetermined number of pulsations, a time interval over the duration of the shorter time interval wherein that holds true is recorded, and recording of pulses with amplitude higher than the lower trigger threshold but not the upper trigger threshold is stopped before the onset of said time interval in the next shorter time interval, and the time interval of time shift of the movable trigger is reset to zero, and recording begins over the next shorter time interval of pulses with amplitude only higher than the lower trigger threshold, once the value of the time shift of the movable trigger becomes equal to the value of the shorter time interval, and the recorded pulses are stored in a storage device. An apparatus which carries out said method is also disclosed.

EFFECT: high accuracy of determining partial discharges.

10 cl, 6 dwg