GlobalBaseSel
: Selects the global base value group used by the function to define (
IBase
),
(
VBase
) and (
SBase
).
The setting of the function is limited to the operate residual current to the protection
(
Pickup
).
The basic requirement is to assure selectivity, that is EFPIOC (50N) shall not be allowed
to operate for faults at other objects than the protected object (line).
For a normal line in a meshed system single phase-to-ground faults and phase-to-phase-
to-ground faults shall be calculated as shown in figure
. The residual
currents (3I
0
) to the protection are calculated. For a fault at the remote line end this fault
current is I
fB
. In this calculation the operational state with high source impedance Z
A
and
low source impedance Z
B
should be used. For the fault at the home busbar this fault current
is I
fA
. In this calculation the operational state with low source impedance Z
A
and high
source impedance Z
B
should be used.
~
~
Z
A
Z
B
Z
L
A
B
IED
I
fB
Fault
ANSI09000022-1-en.vsd
ANSI09000022 V1 EN
Figure 40:
Through fault current from A to B: I
fB
1MRK 511 286-UUS A
Section 6
Current protection
103
Application manual
Содержание REC650 ANSI
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