Power system is a large, interconnected and complex network. The security and stability is the most important factor for a system to work reliable. In order to make the system stable and secured the operator must minimize the outages occurring for this purpose contingency analysis is very important. The operator must have idea about violations that may occur in the system. So here work is done to identifying the weak links in the network by contingency analysis and then going to take necessary precautions to overcome the problem, i.e. strengthening the weak links.