The importance of decentralised energy generation through PV systems will continue to increase. Safe operation of these systems is therefore essential for a stable energy supply. However, solar power cannot be generated without an inverter, the central component of a solar power system. But the inverter could be disrupted or even fail completely if, for example, subjected to the force of a lightning strike. Surge arresters (SPDs) for protecting the DC side of inverters are therefore an important component of protection concepts. DEHNguard MP YPV is the new surge protective device from DEHN for protecting photovoltaic systems on residential buildings. This Type 2 DC surge arrester expands the product range with its practical push-in double terminal. As a prewired, modular complete unit for photovoltaic systems, consisting of a base part and plug-in protection modules, it offers advantages for planning, installation and maintenance.
DEHNguard MP YPV – Compact protection installed quickly
Due to the special, non-linear characteristics of PV power sources, SPDs such as the DEHNguard MP YPV, which comply with the relevant manufacturer test standard EN 61643-31, must be used to protect the DC side of the inverter. The devices have a short-circuit strength Iscpv of 10 kA and are available for system voltages of 1,200 V and 1,500 V. The new product increases the reliability and longevity of the system with surge protection based on high-capacity varistors. The integrated fault-resistant Y circuit prevents damage to the surge protection in the event of insulation faults in the generator circuit. Short stroke loads of up to 40 kA (8/20 μs) can be handled. Smaller voltage peaks are also contained, which would also reduce the life expectancy of the PV electronics due to the sheer number of them. The devices have operating-current-free function and fault indication, which provides the user with immediate information about the operability of each and every protective circuit.
The arrester is easy to install and is also ideal for retrofitting. The visible terminals and clear labelling make wiring easier and prevent installation errors. DEHNguard M YPV is connected by means of a push-in double terminal. EMC-optimised feed-through wiring can be easily implemented without additional terminals.
Petra Raab ⎟ Head of External Communications
Trade Press