You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Protection concept<br />
The following parameters are monitored<br />
continuously and in parallel by the microcontroller<br />
and displayed on the screen:<br />
· DC overvoltage (Fault 3)<br />
· Frequency error (Fault 4)<br />
· Overheating (Fault 5)<br />
· Grid undervoltage, 1-phase (Fault 6)<br />
· Grid overvoltage, 1-phase (Fault 7)<br />
· Grid undervoltage, 3-phase (Fault 8)<br />
· AFI error (Fault 9)<br />
· Insulation error (Fault 10)<br />
· DC feed (Fault 11)<br />
· Isolated operation (Fault 12)<br />
· Grid overvoltage, 3-phase (Fault 13)<br />
· Surge error (Fault 14)<br />
· Grid voltage 10-minute average value<br />
> 10 % U NOM (Fault 15)<br />
In the event of a fault, the conversion is<br />
blocked immediately and the grid relay is<br />
isolated. An alarm relay with floating<br />
output is activated (not for Fault 6).<br />
In addition, the following protective<br />
devices are provided on both grid and<br />
PV generator side:<br />
· Grid-side varistors<br />
Protect the power semiconductors from<br />
high-energy, time-limited voltage spikes<br />
on the grid and provide for a reduction<br />
of energy in the throttle in the event of<br />
grid disconnection.<br />
· Generator-side varistors<br />
Thermally monitored varistors provide<br />
protection against atmospheric overvoltages<br />
(e.g. due to remote strikes during<br />
storms).<br />
98
Change language