Introduction: Fault Passage Indicators (FPI), as a stand alone device has been commercially available for a number of years to the UK DNO population. They work by monitoring the electric and magnetic fields surrounding overhead lines and by understanding what will happen to these fields, following a fault, they can detect whether fault current has past them or not. In this way Customer Minutes Lost (CMLs) could be reduced as circuit restoration would be more efficient. The scope of this project is to consolidate the learning from SSEPDs previous FPI projects involving communicable FPIs, as well as learning from other UK DNOs, to inform the business case for the mass roll out of FPIs. If the decision is taken to roll out FPIs in a large scale programme then SSEPD 'Business as Usual' (BaU) resources will be used.

Objectives: Better identification of fault locations on the distribution overhead network