Siemens siprotec 7SA6 User Manual

Functions
6-2197SA6 Manual
C53000-G1176-C156-2
difference Max. Freq. Diff lie outside the permissible limit values. A precondition
for these messages is that voltages within the operating range of the relay are availa-
ble.
Operating modes The closing check procedure can be selected from the following operating modes:
− SYNC-CHECK = Release at synchronism, that is, when the critical values
Max. Volt. Diff, Max. Freq. Diff and Max.
Angle Diff
lie within the set limits.
− Usync> U-line< = Release for energized bus-bar (U
bus
>) and de-ener-
gizedline(U
line
<).
− Usync< U-line> = Release for de-energized bus-bar (U
bus
<) and ener-
gizedline(U
line
>).
− Usync< U-line< = Release for de-energized bus-bar (U
bus
<) and de-ener-
gizedline(U
line
<).
− OVERRIDE = Release without any check.
Each of these conditions can be switched to be effective or not effective; combinations
arealsopossible(e.g.releasewhen
Usync> U-line< or Usync< U-line> are sat-
isfied). Combination of
OVERRIDE 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.
Dead-line or
dead-bus closing
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
line
liebelowthesetvalueDead Volt. Thr.?
− Does the bus-bar voltage U
bus
lie above the set value Live Volt. Thr., but be-
low the maximum operating voltage
Umax?
− Does the bus-bar voltage frequency f
bus
lie within the permissible operating range
f
N
±3Hz?
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.
Closing at
synchronous
system conditions
To release a closing command at synchronous system conditions, the following con-
ditions are checked:
− Does the bus-bar voltage U
bus
lie above the set value Live Volt. Thr., but be-
low the maximum operating voltage
Umax?
− Does the feeder voltage U
line
lie above the set value Live Volt. Thr.,butbelow
the maximum operating voltage
Umax?
− Does the voltage magnitude difference |U
line
|–|U
bus
| lie within the permissible
tolerance
Max. Volt. Diff?
− Do both the frequencies f
bus
and f
line
lie within the permissible operating range
f
N
±3Hz?
− Does the frequency difference |f
line
–f
bus
| lie within the permissible tolerance Max.
Freq. Diff
?

Siemens siprotec 7SA6 Specifications

General

Brand	Siemens
Model	siprotec 7SA6
Category	Relays
Language	English