SMA SC 500HE-US - Manual (Page 26)

3 Product Description SMA America, LLC
26 SC500HEUS-eng-BE-BUS120320 Operating Manual
3.9 Active Island Detection
The Active Island Detection function detects the formation of stand-alone grids during a grid failure
and disconnects the Sunny Central from the power distribution grid.
Stand-alone grids form when the following conditions occur simultaniously:
• The medium-voltage grid fails.
• The Sunny Central feeds in an amount x of power.
• There is a consumer on the same branch of the grid with a load equal to the amount x of power.
Loss of UL certification
The Active Island Detection function is standardized by IEEE 1547. Deactivation of the
islanding detection results in the loss of the UL certification of the inverter and SMA is not liable
for any resulting damage.