The probabilistic nature of the transient stability problem and the need to
include in the analysis the probabilities associated with the initiating factors
such as the type, location and clearance of faults have been recognized for
some time. These factors, however, are rarely if ever, introduced into the basic
building blocks associated with a power system education program. This paper
extends a published educational test system by including the system data
required to conduct transient stability analysis and hence evaluate the security
of this system. The probabilistic transient stability methodology and the
resulting indices presented in this paper provide a basic understanding of
probabilistic assessment of transient stability and can easily be included in a
power system reliability or stability teaching program.