The operation of electrical networks constantly face contingencies such as generation outages and line faults. When a network is running under high stress levels or a transient fault occurs, the network might undergo angle instability. As a result, the network splits into several islands causing great loss of load and generation thus, creating network instability and a potential blackout. In this paper Center of Inertia (COI) as well as each area is used for the detection of network instability where the rotor angle stability of the entire network is monitored to establish if and when the networkbecomes unstable. The method is implemented on the IEEE 39-bus system known as the 10-machine New-England Power System

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• Detection of Network Instability using Area-Based Centre of Inertia-Referred Frame