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step 3 Tap “Run-parameter” after entering the correct password.
step 4 Click Next to find the page with “Trip” and select “Enable” .
Before the MV Station is put into operation again, set the parameter “Trip” as “Disable” first,
then close all the DC main switches of the MV Station.
- - End
10.14 Protection Function
MV Station has complete protection functions to protect itself when input voltage or grid is
abnormal until the anomaly is removed and the MV Station can operate normally.
10.14.1 DC Over-voltage Protection
When the DC voltage of the PV array exceeds the max. DC voltage, MV Station will stop
operating, send warning signal and display the fault type on the LCD screen.
MV Station can detect the abnormal voltage and respond quickly.
10.14.2 AC Over/under-voltage Protection
When the MV Station AC output voltage exceeds the permissible range, MV Station will stop
feeding the grid, send warning signal and display the fault type on the LCD screen.
MV Station can detect the abnormal voltage and respond quickly.
10.14.3 Frequency Anomaly Protection
When the grid frequency exceeds the permissible range, MV Station will stop feeding the
grid, send warning signal and display the fault type on the LCD screen.
MV Station can detect the abnormal frequency and respond quickly.
10.14.4 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.
System Manual
