METHOD TO CONTROL RESISTANCE OF INSULATION IN DC CIRCUITS RELATIVE TO BODY AND DEVICE FOR ITS REALISATION Russian patent published in 2014 - IPC G01R27/18 

FIELD: measurement equipment.

SUBSTANCE: investigated circuits are grouped into a 2D matrix made of m lines and n columns. Then the groups of circuits making lines and columns of the matrix are in turns connected to a source of DC voltage U via a metering resistor R1, and they perform measurements of voltages ΔU on the resistor R1. Resistances of insulation in groups of circuits are determined according to the formula R_ins=R1×(U/ΔU-1). Each investigated circuit participates in two measurements: first within a group of matrix line, and then within a group of matrix column. On the basis of analysis of measurement results they determine circuits with lower resistance of insulation relative to the body. Generation of commands, measurement of voltages, calculation of insulation resistances and formation of control results is done with the help of the software module. For (m×n) investigated circuits it is required to perform (m+n) measurements.

EFFECT: reduced number of switching elements that are responsible for connection of the circuits to a measurement channel, and reduction of time spent for performance of measurements.

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