operation of compensated over and under voltage function without corresponding
transfer trip received from remote end.
Switchable shunt reactors located on both line terminals and substation bus-bars
are commonly used on long radial EHV transmission networks for the purpose of
voltage control during daily/seasonal load variations.
The function can internally correct for the current through the local shunt reactor.
The setting EnShuntReactor should be On if there is a shunt reactor on the line.
Change in this setting will be effected only when IED is restarted. Hence this
setting should be configured during installing and then connection and
disconnection of shunt reactor breaker should be handled by the input SWIPOS. In
figure
381, if the measured current I
S
is configured in the IED, then internal shunt
reactor correction should be used (The setting EnShuntReactor should be On if
there is a shunt reactor on the line. Change in this setting will reboot the IED to
take effect of X
SR
. Hence this setting should be configured during installing and
then connection and disconnection of shunt reactor breaker should be handled by
the input SWIPOS). Also, for shunt reactor connected through the breaker or
disconnector, status of the same must be configured in the IED as shown in figure
381.
Frequently, the input current to the line protection IED is already corrected for the
current through the local shunt reactor. In figure
381 if the measured current I
L
is
connected to the IED then even if local shunt reactor is present its correction
should not be done inside the function, otherwise this will result into incorrect
calculation for compensated voltage.
IEC09000775 V1 EN-US
Figure 381: Breaker status configured with IED
16.8.4.3 Setting guidelines
GUID-DE3963D6-016E-41AD-832F-1D10DD26AABA v2
GlobalBaseSel: Selects the global base value group used by the function to define
IBase, UBase and SBase as applicable.
OperationUV: Used to set the under-voltage function On or Off.
Section 16 1MRK 506 369-UEN B
Scheme communication
732 Line distance protection REL670 2.2 IEC
Application manual
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