Abstract
A detailed representation of the time-dependent characteristics of a protection system requires a more complex modelling of two elements that are typically outside of the reliability evaluation scope: short circuit current and response given by protection devices. The first requires that aspects such as fault type, affected phases, location and fault resistance are modelled, while the second depends on a proper representation of protection time-current curves. The proposed methodology creates a simulation model where the up and down cycle of components is merged with the operation of protection devices and the fault characteristics using sequential Monte Carlo Simulation. A comparison between the classical approach and a more representative protection modelling highlights the benefits of a time-dependent representation of the performance of protection systems.
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