Siemens siprotec 7SA6 User Manual page 381

Operating modes
Dead-line or
dead-bus closing
Closing at
synchronous
system conditions
7SA6 Manual
C53000-G1176-C133-1
for these messages is that voltages within the operating range of the relay are
available.
The closing check procedure can be selected from the following operating modes:
− 6<1&&+(&.
− 8V\QF! 8OLQH
− 8V\QF 8OLQH!
− 8V\QF 8OLQH
− 29(55,'(
Each of these conditions can be switched to be effective or not effective; combinations
are also possible (e.g. release when 8V\QF! 8OLQH or 8V\QF 8OLQH! are
satisfied). Combination of 29(55,'( with other parameters is, of course, not
meaningful.
The release conditions can be set individually for automatic and for manual closing,
e.g. you can permit manual closing at synchronism or dead line, whilst, before an
automatic reclosure, at one line end only dead line and, at the other, only synchronism
will be permitted.
For release of the closing command to energize a voltage free line from a live bus-bar,
the following conditions are checked:
− Does the feeder voltage U
− Does the bus-bar voltage U
below the maximum operating voltage 8PD[?
− Does the bus-bar voltage frequency f
f ± 3 Hz?
N
When the conditions are satisfied, the closing command is released.
Corresponding conditions apply when switching a live line onto a dead bus-bar or a
dead line onto a dead bus-bar.
To release a closing command at synchronous system conditions, the following
conditions are checked:
− Does the bus-bar voltage U
below the maximum operating voltage 8PD[?
− Does the feeder voltage U
the maximum operating voltage 8PD[?
− Does the voltage magnitude difference |U
tolerance 0D[ 9ROW 'LII?
− Do both the frequencies f
f ± 3 Hz?
N
− Does the frequency difference |f
)UHT 'LII?
= Release at synchronism, that is, when the critical values
0D[ 9ROW 'LII, 0D[ )UHT 'LII and 0D[
$QJOH 'LII lie within the set limits.
= Release for energized bus-bar (U
energized line (U <).
line
= Release for de-energized bus-bar (U
energized line (U >).
line
= Release for de-energized bus-bar (U
energized line (U <).
line
= Release without any check.
lie below the set value 'HDG 9ROW 7KU?
line
lie above the set value /LYH 9ROW 7KU, but
bus
lie within the permissible operating range
bus
lie above the set value /LYH 9ROW 7KU, but
bus
lie above the set value /LYH 9ROW 7KU, but below
line
| – |U
line
and f lie within the permissible operating range
bus line
| lie within the permissible tolerance 0D[
– f
line bus
Functions
>) and de-
bus
<) and
bus
<) and de-
bus
| lie within the permissible
bus
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