DIN EN 50539-11:2013-12

This standard defines the requirements and tests for surge protective devices (SPDs) intended to be installed on the d.c. side of photovoltaic installations (PV installations) to protect against induced and direct lightning effects. This standard applies to devices that are connected to d.c. power circuits of photovoltaic generators, rated up to 1 500 V. It takes into account that photovoltaic generators: - behave like current generators, - that their nominal current depends on the light intensity, - that their short-circuit current is almost equal to the nominal current, - are connected in series and/or parallel combinations leading to a great variety of voltages, currents and powers from a few hundreds of W (in residential installations) to several MW (photovoltaic fields). The very specific electrical parameters of PV installations on the d.c. side require specific test requirements for SPDs. SPDs with separate input and output terminal(s) that contain a specific series impedance between these terminal(s) (so called two port SPDs according to IEC 61643-11) are currently not sufficiently covered by the requirements of this standard and require additional consideration. In general SPDs for PV applications do not contain a specific series impedance between the input/output terminals due to power efficiency considerations. SPDs complying with this standard are exclusively dedicated to be installed on the d.c. side of photovoltaic generators. Other d.c. applications are not taken into account. Additional requirements and tests may be necessary for such applications. SPDs for which the manufacturers declares short circuit mode overload behaviour, shall require specific measures to ensure that such devices will not endanger the operator during maintenance and replacement due to possible d.c. arcing. The responsible committee is UK 441.1 "Überspannungsableiter bis 1 000 V" ("Surge arresters up to and including 1 000 V") of the DKE (German Commission for Electrical, Electronic and Information Technologies) at DIN and VDE.