International Journal of Engineering and Information Systems (IJEAIS)   Year: 2018 | Volume: 2 | Issue: 7 | Page No.: 34-41 Static Security Analysis of Transmission System Ahmed R. Abul'Wafa, Aboul’Fotouh El'Garably, Shazly N.Fahmy Ahmed Abstract: Abstract-Power system security is the ability of the system to withstand contingencies that contain one or more component outages with the minimal disruption of service or its quality. Maintaining power system security employs to examine the system performance in case of post contingency. Consequently, studying of contingencies forms an important aspect for system security. The purpose of this paper is to study the effect of contingencies in terms of its severity in order to identify the most severe contingencies and then processing it into a secure operating state using a remedial action scheme. To achieve this study, both of a preliminary system load flow and reliability assessments are performed to specify bus voltage, MW active power flows and obtain the system reliability indices. Contingency analysis technique using Newton Raphson Load Flow (NRLF) method is applied for each contingency to investigate the resulting effects on power flows and bus voltage of the remaining system. This paper uses contingency selection and ranking technique to identify the most severe contingencies from the contingency list by calculating both of voltage performance index (PIV) and active power performance index (PIP) for each severe contingency in MATLAB environment. Remedial Action Scheme (RAS) is used to handle the effect of the most severe contingencies and return the system into a secure state of operation. Both of load flow and reliability assessments for the corrected system are performed to investigate the effectiveness of the proposed RAS on the system. This proposed work is implemented on IEEE 14 bus system with the help of Digsilent software.