The HPCI learns how high the impact and reduces the power
accordingly
0 Overhead transmission grids with higher natural unbalance and therefore higher zero
sequence voltage UNE)
– The measure here could consist switching the phase (L1 L2) that used for in-
jection. This can actually reduce the zero sequence voltage during injection. smaller grids, the
HPCI ‘learns’ and reduces the injection power accordingly.1 Automatic power adjustment and phase switching L1-L2
Basically, current injection impacts the zero sequence voltage.
LP
I CI
U1
Une
L2
L1
U2
K1
Figure 158: Switching the injection phase (L1 L2) automatically through relay K1
. The impact the zero sequence
voltage remains optimal ratio the exact calculation the grid's capacity.3. There are two states that can au-
tomatically improved applying different HPCI measures:
0 Very symmetrical and 'small' grids (grid size capacitive current)
– The measure here would consist automatically adjusting the power (reducing the
injection power).
14.
Based the absolute value and phase the natural zero sequence voltage, injecting high-
power current can increase the zero sequence voltage.Page 227
Commissioning the HPCI
Automatic power adjustment!
The current version the HPCI can adjust the power automatically
