HIGH-VOLTAGE DIAGNOSTIC METHOD AGAINST PARTIAL DISCHARGE PARAMETERS Russian patent published in 2014 - IPC G01R31/12 

FIELD: electricity.

SUBSTANCE: invention is used invention relates to high-voltage engineering, in particular, to diagnostics of high-voltage equipment against parameters of electric noise induced by partial discharges. The invention concept is as follows: an electromagnetic field of partial discharges in insulation is sensed by inductive and capacitance transducers, which output signals are filtered, amplified and multiplied one by the other. Depending on the product sign informative signals are generated; the first signal is proportional to the valid average apparent charge of the partial discharges while the second signal is proportional to the valid average time of current impulses induced by the partial discharges. By means of the first signal there corrected is the speed of changing the intensity of the electric field in insulation, thus providing the frequency stabilisation of the current average value of an apparent charge by the partial discharges. By means of the second signal dependency is defined of the current pulse time resultant from the partial discharges on voltage at high-frequency input of the controlled equipment.

EFFECT: reducing the measurement error, increasing selectivity and reliability of diagnostics.

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