METHOD OF MEASURING INSULATION RESISTANCE OF ELECTRICAL NETWORKS WITH CONTROL OF MEASUREMENT ACCURACY BY USING MATHEMATICAL STATISTICS METHODS Russian patent published in 2019 - IPC G01R27/16 

FIELD: electrician.

SUBSTANCE: invention relates to electrical measurements, namely to measurements of resistance of insulation of power and low-current electric cables of limited capacity of ship electric installations, which are under working voltage of direct current or de-energized and isolated from "ground". Disclosed is a method of measuring insulation resistance of electrical networks with monitoring accuracy of measurement using mathematical statistics methods, designed to measure insulation resistance of low-current and power electric cables of direct current of limited capacity, which are under operating voltage or de-energized and isolated from "ground". Task of the proposed method is matching of functional capabilities of the instrument built into the electrical installation for measurement of insulation resistance and technical requirements for real electrical facilities. Substance of the method consists in taking parameters of a transient process associated with the absorption current until the gradient of the measured current falls below three mean square measurement errors, obtained by accuracy estimation by statistical methods at each measurement point with subsequent calculation of insulation resistance and root-mean-square measurement of insulation resistance measurement. Measurement method allows simplifying the design of the device and reducing its prime cost at achieving all specified characteristics of technical specifications for ship electrical installations using low-current and power cables of limited capacity, which are under operating DC voltage or de-energized and isolated from "ground".

EFFECT: technical result consists in improvement of measurement accuracy while providing evaluation of measurement error by statistical methods and allowable measurement time on networks of limited capacity, as well as in accumulation of parameters characterizing transition process of absorption current in order to analyze change of insulation quality during cable operation.

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