Moreover, high zero sequence voltage healthy grid in-
creased continuous load for the insulation single phase.
Note:
The parameters Umax_End_Threshold, Umax_End_Priority and
Umax_Hysteresis apply tuning performed AUTO mode.
0 100
10
-2
10
-1
10
0
10
1
Coil position [%]
Une
in
[%]
Self-extinguishing
current limit
detuning
Umax_end_threshold
Umax_end hysteresis
Figure 81: Umax_End and self-extinguishing current limit; Description
0 Umax_End threshold
This value used set maximum zero sequence voltage for the tuning point.
A value disables the 'Umax_End' function.
Default setting: s
Note:
The parameters Umax_Threshold, Umax_Delay and Umax_Hysteresis apply search pro-
cesses performed AUTO mode.
Default setting:.Page 112 Detailed description REG-DP/ REG-DPA parameters
We take care it. If, for ex-
ample, the zero sequence voltage too high the target tuning point, the coil moved
away from the resonance point until the smaller zero sequence voltage Umax_End has
been reached. The regulator displays 'Tune'. this case, the line-to-earth-
voltage must added the zero sequence voltage (absolute value and phase).
This function makes sense very unbalanced grids with big zero sequence voltage the
resonance point. This why
it possible have too high voltage for least one line-to-earth-voltage. Too high zero sequence voltage the tuned state can overexcite earth
fault detection systems
