8.1.3
Setting guidelines
IP14979-1 v1
M12915-4 v9
The parameters for instantaneous phase overcurrent protection PHPIOC are set via
the local HMI or PCM600.
This protection function must operate only in a selective way. So check all system
and transient conditions that could cause its unwanted operation.
Only detailed network studies can determine the operating conditions under which
the highest possible fault current is expected on the line. In most cases, this current
appears during two-phase fault conditions. But also examine single-phase-to-earth
condition.
Also study transients that could cause a high increase of the line current for short
times. A typical example is a line with a power transformer at the remote end,
which can cause high inrush current when connected to the network and can thus
also cause the operation of the built-in, instantaneous, overcurrent protection.
Common base IED values for primary current (
IBase
), primary voltage (
UBase
)
and primary power (
SBase
) are set in the global base values for settings function
GBASVAL.
GlobalBaseSel
: This is used 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
M12915-9 v8
The following fault calculations have to be done for two-phase and single-phase-
to-earth faults. With reference to Figure
, apply a fault in B and then calculate
the through-fault phase current I
fB
. The calculation should be done using the
minimum source impedance values for Z
A
and the maximum source impedance
values for Z
B
in order to get the maximum through fault current from A to B.
Section 8
1MRK 506 375-UEN A
Current protection
158
Railway application RER670 2.2 IEC
Application manual
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