Induced surges are the more likely cause of lighting damage in majority or installations,
especially in rural areas where electricity is usually by long overhead lines. Surge
may be included on both the PV array conduction and the a.c. cables leading to
the building.
Specialists in lighting protection should be consulted during the end use application.
Using appropriate external lighting 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 d.c. system, surge suppression device (SPD type2) should be fitted
at the inverter end of the d.c 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, a additional SPD type 3 required for surge protection
for electrical devices.
To protect the a.c system, surge suppression devices (SPD type2) should be
fitted at the main incoming point of a.c 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.
All d.c cables should be installed to provide as short runs as possible, and positive
and negative cables of the same string or main d.c supply should be bundled
together. Avoiding the creation of loops in the system. This requirement for
short runs and bundling includes any associated earth/bundling conductors.
Spark gap devices are not suitable to be used in d.c circuits as once conducting,
they won’t stop conducting until the voltage across their terminals is typically
more than 30 volts.
2.2 Important Safety Instructions
• All work on the inverter must be carried out by qualified electrician.
• The appliance is not to be used by children or persons with reduced
physical sensory or mental capabilities, or lack of experience and
knowledge, unless they have been given supervision or instruction.
• Children should be supervised to ensure that they do not play with
the appliance.
DANGER!
DANGER TO LIFE DUE TO HIGH VOLTAGES IN THE INVERTER!
Surge protection devices (SPDs) for PV installation
Over-voltage protection with surge arresters should be provided
when the PV power system installed.
The grid connected inverter is not fitted with SPDs in both PV
input side and MAINS side.
WARNING!
Lighting can cause damage either from direct strike or from surges due to a nearby
strike.
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