EG4 8KEXP-240 User Manual page 6

Lightning will cause damage either from a direct strike or from surges due to a nearby strike.
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Induced surges are the most likely cause of lightning damage in majority or installations,
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especially in rural areas where electricity is usually provided by long overhead lines. Surge may
be included on 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
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appropriate external lightning protection, the effect of a direct lightning strike into a building can
be mitigated in a controlled way.
Installation of SPDs to protect the inverter against mechanical damage and excessive stress
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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, a surge suppression device (SPD type2) should be fitted at the inverter
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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 is required for surge protection for electrical devices.
To protect the AC system, surge suppression devices (SPD type2) should be fitted at the main
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incoming point of AC supply (at the consumers cutout), located between the inverter and the
meter/distribution system.
All DC cables should be installed to provide as short a run as possible, and positive and negative
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cables of the string or main DC supply should be bundled together. This avoids the creation of
loops in the system.
Spark gap devices are not suitable to be used in DC circuits once conducting, they won't stop
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conducting until the voltage across their terminals is typically more than 30 volts.
➢ Anti-Islanding Effect
Islanding effect is a special phenomenon that grid-connected PV system still supply power to the nearby
grid when the voltage loss is happened in the power system. It is dangerous for maintenance personnel
and the public. This inverter provides Active Frequency Drift(AFD) to prevent islanding effect.
➢ PE Connection and Leakage Current
The end-use application shall monitor the protective conductor by residual current operated protective
device (RCD) with rated fault current Ifn≤240mA. This automatically disconnects the device in case of a
fault. The device is intended to connect to a PV generator with a capacitance limit of approximately
700nf.
Incorrect grounding can cause physical injury, death or equipment malfunction.
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