APPLICATION OF LABVIEW MEDIUM FOR INVESTIGATION OF TRANSIENT PROCESSES IN POWER CABLES IN ORDER TO MONITOR ITS INSULATION CONDITION

Abstract

The article considers the methods of diagnostics of insulation of power cable lines (MCL). It is proposed to use a model of a power cable in the form of a chain circuit to perform nondestructive insulation testing of the SCL, moreover, in the absence of local defects along the length of the cable, the model is presented in the form of a uniform chain circuit, and in the presence of local defects - in the form of a non-uniform chain circuit. By the method of variable states for these schemes, a mathematical model was compiled, on the basis of which a virtual device was developed in the LabVIEW environment. The operation of the device is based on the fact that when local defects occur in the cable insulation, for example, in the form of water tridges or gas inclusions, partial discharges occur in these places, therefore, when high DC voltage is supplied to the tested high-voltage cable, the nature of the time relationships of input voltage u (t) and current i (t) changes. The paper shows that by studying the nature of said electromagnetic transients with the help of a developed virtual device, it is possible to monitor the presence of local defects in the insulation of the MCL. The effectiveness of the proposed control method was confirmed by numerical experiment.