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S
afety devices
A
nti-Islanding
Anti-islanding protection mechanisms are different depending on the grid standards, even if
they all have the same purpose.
G
round fault of the photovoltaic panels
O
vervoltage surge arresters (-SX/SX2 models only)
O
ther safeguards
The numerous control systems determine a redundant structure to ensure absolutely safe
operations.
In the event of a local grid outage by the electricity company, or when
the equipment is switched off for maintenance operations, the inverter
must be physically disconnected to ensure the protection of the people
working on the grid, in accordance with the relevant national laws and
regulations. To prevent possible islanding, the inverter is equipped with
an automatic safety disconnection system called "Anti-Islanding".
The method used to ensure an active anti-islanding protection is: active
frequency drift in combination with RoCoF techniques.
Use this inverter with panels connected in "floating" mode, i.e. with no
earth connections on the positive and negative terminals. An advanced
ground fault protection circuit continuously monitors the ground connec-
tion and disconnects the inverter when a ground fault indicating the fault
condition by means of the red "GFI" LED on the LED panel
side of wiring box.
As an additional protection to prevent damage caused by the discharges
from lightning and electrostatic induction phenomena, the wiring box is
equipped with DC overvoltage surge arresters
surge arresters
.
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The inverter is equipped with additional protective devices to ensure safe
operation in any circumstance. These protections include:
- Constant monitoring of the grid voltage to ensure that voltage and fre-
quency values remain within operating limits;
- Internal temperature control to automatically limit the power if necessary to
prevent overheating of the unit (derating).
- 42 -
3 - Characteristics
on the front
08
and with AC overvoltage
21
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