Electronic String Fuse; Reactive Power Feed-In And Grid Management - SMA SUNNY TRIPOWER 8000TL Installation Manual

Product Description SMA Solar Technology AG
3.3 Electronic String Fuse
The Sunny Tripower is equipped with an electronic string fuse. It prevents dangerous reverse currents
in the PV array and thus plays a key role in fire prevention. Reverse currents can occur if connections
are reverse poled during installation or as a result of module defects during operation. The electronic
string fuse recognizes these defects and shorts the PV array. This prevents the occurrence of reverse
currents and thus safeguards both the PV plant and the Sunny Tripower. An advantage of this method
is that conventional fuses at the DC inputs are not necessary. The electronic solution is entirely
maintenance-free and does not require any dimensioning.
In order to use this function optimally, the greatest of attention is necessary during commissioning (see
section 6.4 "Connecting the PV Array (DC)" (page 32)). The Sunny Tripower warns of dangerous
conditions by beeping and issuing warnings in the display or via external communication. If electrical
installation takes place under conditions of insufficient irradiation (PV voltage smaller than 188 V), the
Sunny Tripower will not have power supply which means that the protective functions described
above will not be active during installation.
3.4 Reactive Power Feed-in and Grid Management
The Sunny Tripower is capable of utilizing reactive power and can feed reactive power into the grid
via the setting of a default value for the displacement power factor (cos φ). Additionally this inverter
is also equipped with advanced grid management functions, e.g. power limitation and dynamic grid
support. These functions can be activated and configured depending on the requirements of the utility
operator.
You will find detailed information on the setting parameters of these functions in the Technical
Description "Reactive power feeding and grid stability management" in the download area at
www.SMA.de/en in the "Technical Description" category of the respective inverter.
16 STP8-17TL-IA-IEN112030 Installation Manual