UNE-EN 61643-31:2021

This part of IEC 61643 is applicable to devices for surge protection against indirect and direct effects oflightning or other transient overvoltages. These devices are designed to be connected to the d.c. side ofphotovoltaic installations rated up to 1 500 V d.c.These devices contain at least one non-linear component and are intended to limit surge voltages and divertsurge currents. Performance characteristics, safety requirements, standard methods for testing and ratingsare established.SPDs complying with this standard are exclusively dedicated to be installed on the d.c. side of photovoltaicgenerators and the d.c. side of inverters.SPDs for PV systems with energy storage (e.g. batteries, capacitor banks) are not covered.SPDs with separate input and output terminal(s) that contain specific series impedance between theseterminal(s) (so called two-port SPDs according to IEC 61643-11) are not covered.NOTE 1 In general SPDs for PV applications do not contain a specific series impedance between the input/output terminals due topower efficiency considerations.NOTE 2 Wherever reference is made to the electric power system or the power system within this document, this refers to the d.c. sideof the photovoltaic installation.