Study of Short Circuit Faults-Case study Sudanese National Grid

Abstract

In the previous period, the national grid experienced many changes represented in the addition of Merawi power station and the addition of so many new stations. This extension required the calculation of short circuit levels to determine the ratings of protective devices and to ensure the safety of power system components. Short circuit levels were calculated for all buses according to IEC-60909 standard using ETAP 16.0 program. Most of the calculated fault levels were realistic and acceptable, these values were compared with the existing ratings of circuit breakers and most of the values were satisfactory except at eleven buses where the short circuit levels exceeded the ratings of the associated circuit breakers.