Reliability is a key aspect of power system design and planning. This work aims to evaluate and improve the reliability of a power distribution network in Baghdad city. The minimal cut set method has been adopted for reliability evaluation. Evaluating the reliability requires calculating and evaluating a set of reliability indices. In this research, the reliability indices are calculated for Al_Mansour 11kV distribution network in Baghdad city. According to these indices several improvements have been proposed and simulated on the network as follows:
Adding N/C manually switches in the network for isolating fault area and restoring the service to the remaining parts.
Adding N/O manually switches to interconnect feeders and provide alternative supply.
Replacing the manually switches by remotely controlled or fully automated switches with fault indicators to reduce interruption times.
Replacing the overhead lines by underground cables to reduce the fault rates. The software CYMDIST version 7.1 has been used as a tool for the simulation of the distribution network and performing the required analysis.