Hitachi Relion 670 Series Applications Manual page 150

Section 8
Current protection
GlobalBaseSel: To select GBASVAL function for reference of base values.
Operation: Set the protection to On/Off.
IP>>: Set operate current in % of IB.
IP>>Max and IP>>Min should only be changed if remote setting of operation current level, IP>>, is
used. The limits are used for decreasing the used range of the IP>> setting. If IP>> is set outside
IP>>Max and IP>>Min, the closest of the limits to IP>> is used by the function. If IP>>Max is smaller
than IP>>Min, the limits are swapped.
IP>>MinEd2Set: Minimum settable operate phase current level in % of IBase, for IEC 61850 Ed. 2
settings.
IP>>MaxEd2Set: Maximum settable operate phase current level in % of IBase, for IEC 61850 Ed. 2
settings.
8.1.3.1 Meshed network without parallel line
The following fault calculations have to be done for two-phase and single-phase-to-earth faults. With
reference to Figure 53, apply a fault in B and then calculate the through-fault phase current I
calculation should be done using the minimum source impedance values for Z
source impedance values for Z
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IEC09000022 V1 EN-US
Figure 53:
Then a fault in A has to be applied and the through fault current I
order to get the maximum through fault current, the minimum value for Z
Z have to be considered.
A
144
in order to get the maximum through fault current from A to B.
B
I
fB
A
Z Z
A L
IED
Through fault current from A to B: I
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B
Z
B
Fault
IEC09000022-1-en.vsd
fB
has to be calculated, Figure 54. In
fA
and the maximum value for
B
1MRK506375-UEN Rev. N
M12915-9 v8
. The
fB
and the maximum
A
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Railway application RER670
Application manual