Insulation-Resistance Meters with Enhanced Functional Capabilities

Abstract

Electrical power objects (EPO), in which the continuous monitoring of insulation resistance is necessary for ensuring their reliable functioning, are described. The key parameters of such EPO are specified. The comparative analysis of the most progressive decisions applied in the devices for determination of insulation resistance in various EPO is carried out. The tendency to creation of the universal devices of measurement and monitoring is noted, the description of foreign and domestic devices is provided. Analyzed the parameters of instruments IRDH375 and IRDH575 firm Bender. It is shown that for a number of responsible EEE their speed is unacceptable. Analyzed the parameters of the device Vigilohm IM400 company Schneider Electric, its speed is also low. The principle of operation of domestic devices CM1628.1 and ICSIM1623 is briefly described. It is shown that the use of a current source allows to reduce the current ripple in the measuring circuit, as well as to increase the speed. The work algorithm includes not only the determination of insulation resistance, but also the determination of the time constant of the transient process and the calculation of the electrical capacity of the object under test relative to the ground. This allows you to correctly set the time intervals for the measurement process. The ways of expansion of their functionality are shown and analyzed