Sungrow SG2500U-MV, Системное руководство

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10 MV Station Functions System Manual
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is operating and the local load of the MV Station is similar to the present output power.
“Islanding” is a potential threat to devices and operators.
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If the MV Station continues power supply after the grid is out of power supply, death
or injury may occur to the maintainers during maintenance.
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When power grid fails, the MV Station continues power supply. Once the grid
resumes, a surge current may occur and damage devices.
MV Station is equipped with anti-islanding protection function.
In anti-islanding protection state, high voltage is still present. Disconnect the
main switch and discharge before testing or maintenance.
10.12.5 Reverse polarity protection
When the PV array inputs‟ polarities are connected reversely, MV Station will stop and
protect itself against damage and resume normal operation after the connection is
corrected.
10.12.6 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.
10.12.7 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 MV
Station and display the fault type on the LCD screen.
10.12.8 Module over-temperature protection
IGBT modules inside the MV Station use 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.
10.12.9 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, DSP will help to
maintain the safe operation of the MV Station by sending instruction to stop the MV Station.
10.13 Firefighting
10.13.1 General Introduction
Respect the national and local firefighting rules and regulations.
Periodically check and maintain the firefighting devices.
10.13.2 Smoke Detector
Smoke detector, located on roof of the MV Station, is a device that detects smoke, typically
as an indicator of fire. When smoke is detected, detector will issue a local audible or visual
alarm and a warning signal. The installation of smoke detector can protect the electrical