Error analysis of the indirect method for monitoring network isolation parameters relative to the ground in MATLAB/Simulink

The insulation parameters of electrical installations must be determined to find methods to prevent electrical injuries and ensure the safety of operation and reliability of power supply to electricity consumers. By identifying areas showing a steady decrease in insulation during operation and repairing such areas in a timely manner, the reliability of power supply and operational safety can be significantly improved. Complete information about the insulation of electrical installations can be obtained by applying appropriate insulation monitoring methods. The article offers a brief description of existing methods for determining the parameters of network isolation relative to the ground and analyzes the errors of the indirect method based on connecting to one of the phases of additional capacity. A computer model of the influence of various factors on the accuracy of measurements of the insulation parameters of the network phases relative to the ground was analyzed. The analysis showed that with phase voltage asymmetry and changes in the magnitude and type of load, the measurement error of the proposed method does not exceed 8%.