Short Circuit Analysis & Over current Relaying Coordination of IEEE 9-Bus System

It is an essential and compulsory to design an empty interrupted electrical power system network having security, stability and reliability in this electricity dependent era. In this paper Short circuit analysis and Protection relying coordination of IEEE 9-Bus system is analyzed and designing of overcurrent relaying scheme to operate the relay quickly and disconnect the faulty section from healthy section. Electrical Power system built in the industry needs appropriate protection strategy for reliable operation. Undetected and sudden faults can become hazardous and disturb the entire system, power devices and causes the overheating, unbalanced system conditions, up and down of the system voltage and blackouts etc. Proposed designing consists of nine buses (two generator buses, one slack bus and six load buses), three transformers of 100MVA at three buses Bus- 1, 2 & 3, placement of transmission lines are used. The load flow and fault analysis study are carried out before the protection design of the system. The power flow analysis keeps vital role due to identification of network capability to run with maximum load having no any effect on the system stability. The load flow and fault analysis study are carried out before the protection design of the system.