Warning!
Over-voltage protection with surge arresters should be provided
when the PV power system is installed.
The grid connected inverter is not fitted with SPDs in either the PV
input side or the MAINS side.
Surge protection devices (SPDs) for PV installation
Lightning will cause a damage either from a direct strike or from surges due
to a nearby strike.
Induced surges are the most likely cause of lightning damage in the majority
of installations, especially in rural areas where electricity is usually provided
by long overhead lines. Surge may affect both the PV array conduction and
the AC cables leading to the building.
Specialists in lightning protection should be consulted during the end use
application. Using appropriate external lightning protection, the effect of a
direct lightning strike into a building can be mitigated in a controlled way,
and the lightning current can be discharged into the ground.
Installation of SPDs to protect the inverter against mechanical damage and
excessive stress include a surge arrester in case of a building with external
lightning protection system (LPS) when separation distance is kept.
To protect the DC system, surge suppression device (SPD type2) should be
fitted at the inverter end of the DC cabling and at the array located
between the inverter and the PV generator, if the voltage protection level (
VP) of the surge arresters is greater than 1100V, an additional SPD type 3
required for surge protection for electrical devices.
To protect the AC system, surge suppression devices (SPD type2) should be
fitted at the main incoming point of AC supply (at the consumer’s cutout),
located between the inverter and the meter/distribution system; SPD (test
impulse D1) for signal line according to EN 61632-1.
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