~
~
Z
A
Z
B
Z
L1
A
B
I
M
Fault
IED
Z
L2
M
C
Line 1
Line 2
ANSI09000025_2_en.vsd
ANSI09000025 V2 EN
Figure 42:
Two parallel lines. Influence from parallel line to the through fault current:
I
M
The minimum theoretical current setting (Imin) will in this case be:
I m in
M A X I
fA
I
fB
I
M
,
,
(
)
³
EQUATION287 V1 EN
(Equation 36)
Where:
I
fA
and I
fB
have been described for the single line case.
Considering the safety margins mentioned previously, the minimum setting (Is) is:
m
1.3.I
s
in
I
³
EQUATION288 V2 EN
(Equation 37)
Transformer inrush current shall be considered.
The setting of the protection is set as a percentage of the base current (
IBase
).
Operation
: set the protection to
Enabled
or
Disabled
.
Pickup
: Set operate current in % of
IBase
.
IBase
is a global parameter valid for all
functions in the IED.
1MRK 511 286-UUS A
Section 6
Current protection
105
Application manual
Содержание REC650 ANSI
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