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10.13.4 Islanding Protection
Islanding is a condition that can occur if the utility grid is disconnected while the MV
Station is operating and the local load of the MV Station is similar to the present output
power.
“Islanding” is a potential threaten to devices and operators.
•
In the event of grid outage, if the MV Station still feeds power to the public grid, death
or injury may occur to the maintainers during maintenance.
•
In the event of grid fault, if the MV Station still feeds power to the public grid, a surge
current may occur and damage devices once the grid resumes.
MV Station is equipped with anti-islanding protection function.
In anti-islanding protection state, high voltage is still present. Disconnect the
main switch and wait the device to discharge completely before testing or
maintenance.
10.13.5 Overload Protection
When the PV array output power exceeds the MV Station permissible maximum input
power, MV Station will limit the power yield at maximum AC power point. If the
temperature exceeds the permissible value, MV Station will automatically stop operating
unless the condition resumes normal.
10.13.6 Ground Protection
The grounding cables are equipped with the leakage current sensor. When the leakage
current is detected to exceed the setting value, system will send instruction to stop the
module and display the fault type on the LCD screen.
10.13.7 Module Over-temperature Protection
IGBT modules inside the MV Station uses thermal sensor with high-precision to monitor
the real-time module temperature. Once the module temperature is detected to be high,
DSP will send direction to stop the MV Station or derate the output.
10.13.8 Internal Over-temperature Protection
The MV Station is equipped with high-precision thermal sensor to monitor the internal
temperature of the MV Station. Once the over-temperature is detected, the DSP will
send an instruction to stop the MV Station and keep safe operation.
System Manual
Содержание SG4950HV-MV
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