SMA SC 500CP-US-10 600V - Manual (Page 33)

SMA America, LLC 3 Product Description
Operating Manual SCCP-US-BE-US_en-52 33
3.6.2 Ground Fault Monitoring in Grounded PV Arrays
3.6.2.1 Ground Fault Detection Interruption (GFDI)
Depending on the configuration, ground fault monitoring in the inverter is carried out via ground fault detection
interruption (GFDI). This process is used to ground one pole of the PV array via the GFDI.
GFDI is performed via a high-performance k-type circuit-breaker with adjustable operating current. The GFDI is integrated
in the inverter and connected between an input busbar and the grounding busbar.
Figure 11: GFDI in the inverter
3.6.3 Insulation Monitoring
3.6.3.1 Insulation Monitoring Device
Depending on the configuration, an insulation monitoring device monitors the insulation resistance of the PV plant in
ungrounded utility grids.
In the operating state "MPP load operation", the insulation resistance of the entire system, from the PV modules to the
medium-voltage transformer, will be measured.
If the inverter is in the "Grid monitoring" operating state, only the insulation resistance from the PV modules to the inverter
is measured.
Figure 12: Insulation monitoring device in the inverter
Position Description
A GFDI