Analysis of auxiliary DC installations in power plants and substations according to Draft International Standard IEC-1660

In this paper, the analysis of auxiliary DC installations in electrical power plants and substations considering the transient state at the beginning of the failure operating mode, is compared with the analysis using a simplified installations model (only resistances with no capacities and inductances). An original program package IRA for the analysis and dimensioning of auxiliary DC installations in both cases is developed. A test model of auxiliary DC installations is calculated using the program package, and the achieved results are compared.