Implementation of a digital directional Fault Passage Indicator

Fault Passage Indicators (FPIs) are a cost effective solution to increase grid reliability. The connection of Distributed Generation units can lead them to misoperate and undermine the reliability improvements. Directional FPIs is a solution to overcome this problem. In this paper, the fault detection methods and direction-polarization principles for an isolated grid are described. As well, the implementation is done in Matlab-Simulink, from the signal processing techniques till the logic scheme for fault confirmation and automated reset. Some simulations are conducted to evaluate the performance of such FPI.