1 Electrical Eng. Dep., University of Technology, Baghdad, Iraq

2 Computer Center, University of Baghdad, Baghdad, Iraq


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.


Main Subjects