Switch-off thresholds U, f: The modification of the parameters has been severely restricted. So most of the parameters can not be changed anymore. Exceptions are the voltage increase protection, the 10min mean value and the thresholds for f and U. All these parameters must be password protected (in addition to the seal).
Inverter: For the voltage reduction protection U <0.8UN, the delay time increases to 3 seconds to ensure that power generation systems on the low-voltage grid now also support the grid stabilization.
Technical rules for connection to the medium-voltage network
Starting with the new TAR low-voltage (VDE-AR-N 4100), a new basic regulation for this voltage level is created. From a power level Pn> 135kW, a second parameter for the frequency increase protection (so far only one) is now available. The former limit applying of the standard at> 100kW is replaced by> 135kW.