SMA STP 60-10 - Phase Failure Detection; Rate of Change of Frequency

3 Grid Failure
SMA Solar Technology AG
Technical InformationSTP60-SHP75-10-Parameter-TI-en-128
3.2 Phase Failure Detection
The phase failure detection is used to determine the failure of one or more line conductors of the utility grid. In case of
a grid failure, the grid relays open.
Parameter name Setting options
OPEN_PH_DETECT on (1)
off (0)
The ramp-in factor describes the ramp for the power up of the inverter. More details can be found in the settings for
grid management services under parameter Connection/reconnection ramp rate.
3.3 Rate of Change of Frequency
The parameter RoCoF or Rate of Change of Frequency measures the change in frequency. If the change in
frequency exceeds the stated maximum limit for a longer period of time, the inverter disconnects from the utility grid.
The frequency can change very rapidly if one or several line conductors fail.
Parameter name Setting range Step size
LOM_ROC 0Hz/s to 10Hz/s 0.01 Hz/s
LOM_ROC 0Hz/s to 10Hz/s 0.01 Hz/s
T_LOM_ROC 0s to 1800s 0.01s
LOM_ROC_THR 0Hz to 5.0Hz 0.01 Hz