05
04
SafetySafety
DC distribution box
AC distribution box
PV array
· Surge arrestor
· Fuse
· DC breaker
· AC breaker
· Surge arrestor
· Fuse
2 Safety
2.1 Appropriate Usage
This series inverter are PV inverters which can convert the DC current
of the PV generator into AC current and feed it into the public grid.
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 most
situations or installations, 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 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.
All DC cables should be installed to as short as possible, and positive
and negative cables of the string or main DC supply should be bundled
together. Avoid creating 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 passes
through their terminals typically less 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 series inverter provides Active Frequency Drift (AFD) to prevent
islanding effect.
Ø
Electrical
grid
Electric meter
bidirectional
Single-phase Meter
Load
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