1 1
( )
U U
ne
U O
C L
Y Y
U U
Y Y
(1.14)
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. This why the current more less constant across the
faulty section.2.2 The natural, capacitive unbalance healthy grid
In this case, the conductance the earth negligible compared with the capacitive un-
balance the whole grid.14) displayed Figure This circuit valid for
low-impedance single pole faults well grids with natural capacitive unbalance under
the abovementioned assumptions.
The next two sections discuss the dependence UNE and based the coil position. (see also Figure )
Figure The absolute value the zero sequence voltage UNE based the coil position Ip-
os
.Page Applications
We take care it.
6
