2 Safety
2.1 Appropriate Usage
The X3-MIC G2 Series are PV inverters which can convert the DC current of
the PV generator into AC current and feed it into the public grid.
Surge protection devices (SPDs) for PV installation
Over-voltage protection with surge arresters should be provided
when the PV power system is installed.
The grid connected inverter is fitted with SPDs in both PV
input side and MAINS side.
Induced surges are the more likely cause of lightning damage in the majority of installations,
especially in rural areas where electricity is usually provided by long overhead lines.
Surges may be induced on both the PV array conductors or the AC cables
leading to the building.
Specialists in lightning protection should be consulted in the actual 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 protection device (SPD type 2) should be fitted
at the inverter end of the DC cabling and at the array located between the
inverter and the PV generator.
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SafetySafety
Anti-Islanding Effect
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Islanding effect is a special phenomenon that grid-connected PV system still
supplies power to the nearby grid when the grid loss happened in the
power system. It is dangerous for maintenance personnel and the public.
X3-MIC G2 series provide Active Frequency Drift(AFD) to prevent islanding
effect.
1
A
Distribution
Box
Distribution
Box
Inverter
gure 1
Lightning will cause a damage either from a direct strike or from surges due to a
nearby strike.
To protect the AC system, surge protection 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.
All DC cables should be installed to provide as short a run as possible, and positive
and negative cables of the string or main DC 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 DC circuits once conducting,
they won’t stop conducting until the voltage across their terminals is typically
below 30 volts.
Warning!
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