Operation and installation manual
Page 18 of 82
(PVI-10.0/12.5-OUTD-xx Rev:1.2)
2.5
Protective devices
2.5.1
Anti-Islanding
When the local power distribution grid fails due to a fault or when the equipment is
shut down for maintenance operations, Aurora shall be physically disconnected under
safety conditions, so as to protect the people working on the grid, in full compliance
with the applicable prevailing national standards and regulations. To avoid any
possible islanding operation, Aurora is provided with an automatic disconnection
protective system called “Anti-Islanding”.
The AURORA PVI-10.0/12.5-OUTD-xx
model is equipped with a state-of-the-art
anti-islanding protection system certified to the following standards and regulations:
¾
CEI 11-20 and ENEL DK-5940 Regulation (in Italy)
2.5.2
Ground fault of the photovoltaic panels
This version of AURORA shall be used with panels connected in a “floating” way, i.e.
with positive and negative terminal not connected to the ground. A top-notch ground
fault protection circuit constantly monitors the ground connection and turns off
AURORA when a ground fault is detected, indicating ground fault condition through a
red LED on the front panel. AURORA inverter is equipped with a terminal for system
ground lead; please refer to section 3.6 (step 3) for further details.
NOTE
: For more details of AURORA shutdown or possible causes of
malfunction, please refer to sections 5.3 and 5.4
2.5.3
Further Protective Devices
Aurora is equipped with additional protections to guarantee safe operation under any
circumstances. The protections include:
¾
constant monitoring of grid voltage to ensure that voltage and frequency remain
within the specified operational limits (in accordance with DK5940);
¾
inner temperature control to automatically limit the power any time this is
necessary to avoid unit overheating (heatsink temperature
≤
70°C [158°F]).
Many control devices are fitted to AURORA making its structure redundant, but
at the same time ensuring a perfect and fully safe operation.
