2 Safety
2.1 Appropriate Usage
The series inverters 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.
The series inverters 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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