SOFAR 3.3K~12KTL-X User manual
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© Shenzhen SOFARSOLAR Co ., Ltd.
B.4 Self power reduction when grid over frequency
When the grid frequency is over limited value, inverter will reduce output
power which do good to the grid stability.
B.5 Power reduction due to environmental conditions, input output voltage
The power reduction value and the inverter temperature at which it occurs
depend on the ambient temperature and on many operating para-meters.
Example: input voltage, grid voltage and power available from the
photovoltaic field. The inverter can therefore reduce the power during certain
periods of the day and according to the value of these parameters.
C.Software update
SD card is used for updating the firmware.
2.3. Protection modules
A. Anti-islanding
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 safely, to ensure protection of people working on
the grid, all in accordance with the relevant national standards and laws. To
prevent possible islanding, the inverter is equipped with an automatic
protective disconnection system called “Anti-Islanding”.
B. RCMU
SOFAR inverters are equipped with a redundancy on the reading of the
ground leakage current sensitive to all components of both direct and
alternating current. Measurement of the ground leakage current is carried out
at the same time and independently by 2 different processors: it is sufficient
for one of the two to detect an anomaly to trip the protection, with consequent
separation from the grid and stopping of the conversion process.
C. Grid monitoring
Continuous monitoring of the grid voltage to ensure the voltage and
frequency values stay within operating limits.
D. Inverter internal device protection
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