On account of the definition of a voltage jump in pre-norm EN50549-2 and in VDE-AR-N 4120 and VDE-AR-N 4110, it is
typically the case that another voltage jump is detected when the incident is at an end, when the fault is rectified and
when the voltage returns to a normal state. The result of this is that in an active operation mode a dynamic grid support
using a fast feeding of residual current remains active even after the incident has passed and that reactive current is fed
in according to the formulae°(2) and (3). Dynamic grid support using d fast feeding of residual current is then deactivated
after a configurated minimum support time, usually 5 s.
I
b
1
I
Fig. 100:
Formula n° 4
10.3.3
Extract from FRT menu
Country-
spec. Set-
tings
Men
u
level
Display/
Setting
Action in this menu/meaning
4
1
2
3
4
FRT (Fault Ride
Through)
NOTE: The device supports dynamic grid stabilization (Fault Ride-
Through)
Operating mode –
On | Off
Settings | Manual |Pre-
defined zero current
Setting: Manual
All parameters can be configured independently.
Setting: Predefined zero current
Dynamic grid support active on account of immunity to interference and
zero current feed-in. During a voltage incident, the current in the in-
verter is reduced to zero.
All parameters are pre-configured, only the activation threshold for zero
current has to be configured.
Priority – Reactive cur-
rent limitation | Dy-
namic reactive current
Priority: Reactive current priority
Dynamic grid support active on account of immunity to interference and
fast feeding of residual current. The inverter feeds additional reactive
current according to the formulae (2) and (4).
Priority: Effective current priority
Dynamic grid support active on account of immunity to interference and
fast feeding with effective current priority. The inverter feeds in as
much active power as available. If, as a result of this, the maximum con-
tinuous current is not achieved, the device supplies additional reactive
current according to the formulae (2) and (4) up to the limit of continu-
ous current.
Zero current undervolt-
age threshold
Zero current overvolt-
age threshold
0 – 184 V / 253 – 340
V
If one or more phase/phase or phase/neutral conductor voltages move
above the configured threshold, the inverter changes to zero current
mode. The total current is regulated to virtually zero.
Reference voltage
U< - U>
Nominal value of the phase/neutral conductor voltage used as a refer-
ence voltage for formula (1) and (3). Adjustable in the range from level 1
undervoltage protection to level 1 overvoltage protection.
Constant k negative se-
quence dip
Constant k negative se-
quence swell
k 0 – 10 2
Amplification factor for the negative sequence used in the calculation of
the reactive current using formulae (2) and (4) Can be configured inde-
pendently for drops and spikes.
KACO blueplanet 87.0 TL3 KACO blueplanet 92.0 TL3 KACO blueplanet 110 TL3 KACO blueplanet 125 TL3
KACO blueplanet 137 TL3 KACO blueplanet 150 TL3
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