Introduction: Ensuring that the fault performance of the network will be optimised both in respect of the operational techniques to be applied and in the collection of statistical data relevant to the performance of individual circuits. Consistently poor performance of particular circuits and types of equipment will be identified, leading to the identification of cost-effective methods of performance improvements.

Objectives: The main aim was to identify and capture key specific parameters from the NaFIRS and related data, which can be used to improve modelling studies of the High Voltage (HV) network and which can also be used to monitor changes in the long term condition of the HV network and identify poorly performing components and network. For the latter it was especially important that the statistical variation was established so that significant changes could be recognised and action taken where necessary.