Protection of Feeders with High Rooftop PV Penetration

This chapter focuses on short-circuit fault on the feeders supplying residential customers with rooftop photovoltaic (PV) systems. The chapter discusses the sensitivity of the short-circuit fault level and the corresponding current drawn from the distribution transformer, in addition to the node voltages along the low-voltage feeder, following a short-circuit fault. The chapter also demonstrates that various factors such as the PVs’ installation point and rating, as well as the location and type of the fault, impact the study parameters. Furthermore, the chapter illustrates that the time and sequence of the PVs’ isolation following the fault will vary depending on the impedance and location of fault, the PV generation–demand ratio, as well as the network’s earthing type