POREĐENjE SOFTVERSKIH ALATA ATP/EMTP I SIMULINK U KOORDINACIJI IZOLACIJE

Abstract

The paper demonstrates the procedure of risk assessment of electrical equipment insulation failure due to atmospheric lightning using various software tools. When applying any method for determining the risk of insulation failure, it is necessary to repeat a number of simulations of the transient process due to atmospheric lightnings in order to see the statistical influence of random lightning parameters on the numerical value of failure risk. The hazardous parameter curve method is one way to determine the risk of insulation failure. It represents the dependence of the critical shock current of lightning on the slope of the shock wave. The application of the method of the curve of dangerous parameters was performed in two ways. The first method is through the software tool ATP / EMTP, where the modification of the parameters of atmospheric lightning and processing of the results was performed in the tool MATLAB. The second way involves forming the same scheme in the SIMULINK tool, a subroutine of the MATLAB tool. After the analysis, a critical review of these two approaches will be discussed. As the results can be read from the MATLAB tool, a direct comparison of the two methods will be performed. A 110 kV switchyard with two transmission line fields was used to demonstrate the application of software tools. The process of modeling all elements important for analysis is described in detail. Within the simulations, the amplitude and slope of the front of the lightning current waves were varied. The paper presents a comparison of two software tools and an automated calculation of different insulation failure risk analyzes.