The reliability index SAIFI is divided into two parts: oneis due to the protection response and the other one is due to restoration. Toformulate them explicitly as a function of reliability parameters and binaryvariables, an analytical simulation technique is used (Brown). In thistechnique, the impact on the components of the system due to a contingency canbe calculated. This method assumes that faults are mutually exclusive. However,one advantage of this technique is the ability to reflect small changes onSAIFI due to small changes in the system.
In formulating the protection response component of SAIFI,it is assumed that proper coordination of ASDs is always maintained. Thisimplies that the closest device to the fault will be actuated first. Toillustrate this technique, consider figure 1(a).
In this figure, the node F1represents the main substation. The node F2 represents the alternative feeder.ASD1 is located between node k and j and its status is closed.
For a permanent fault at node ,ASD1 will open. Hence, the downstream costumers of ASD1 will experience asustained interruption. The effected customers are represented by .At each node, the process is repeated.
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