2. (see also Figure )
Figure The absolute value the zero sequence voltage UNE based the coil position Ip-
os
.2 The natural, capacitive unbalance healthy grid
In this case, the conductance the earth negligible compared with the capacitive un-
balance the whole grid.Page Applications
We take care it.
The next two sections discuss the dependence UNE and based the coil position.14) displayed Figure This circuit valid for
low-impedance single pole faults well grids with natural capacitive unbalance under
the abovementioned assumptions.14)
Where:
U
Y C
Unbalance the faulty section
3
W P
Y G
Watt-metric component YO
3
C
B C
Capacitive component YO
1
L
P
B
L
Inductive component YO
U1N
Yu
BC
UEN UNE
BL
YW
IF
UNE
Figure Single-phase equivalent circuit for single-pole unbalance
The equivalent circuit for equation (1.
1 1
( )
U U
ne
U O
C L
Y Y
U U
Y Y
(1. This why the current more less constant across the
faulty section.
6
