Functions
6-183
7SA522 Manual
C53000-G1176-C119-2
difference
lie outside the permissible limit values. A precondition
for these messages is that voltages within the operating range of the relay are avail-
able.
Operating modes
The closing check procedure can be selected from the following operating modes:
−
= Release at synchronism, that is, when the critical values
and
lie within the set limits.
−
= Release for energized bus-bar (Ubus>) and de-ener-
gized line (Uline<).
−
= Release for de-energized bus-bar (Ubus<) and ener-
gized line (Uline>).
−
= Release for de-energized bus-bar (Ubus<) and de-ener-
gized line (Uline<).
−
= Release without any check.
Each of these conditions can be switched to be effective or not effective; combinations
are also possible (e.g. release when
or
are sat-
isfied). Combination of
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
lie below the set value
−
Does the bus-bar voltage U
bus
lie above the set value
, but be-
low the maximum operating voltage
?
−
Does the bus-bar voltage frequency f
bus
lie within the permissible operating range
f
N
± 3 Hz?
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 synchro-
nous system condi-
tions
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
, but be-
low the maximum operating voltage
?
−
Does the feeder voltage U
line
lie above the set value
, but below
the maximum operating voltage
?
−
Does the voltage magnitude difference
|U
line
| – |U
bus
|
lie within the permissible
tolerance
?
−
Do both the frequencies f
bus
and f
line
lie within the permissible operating range
f
N
± 3 Hz?
−
Does the frequency difference |f
line
– f
bus
| lie within the permissible tolerance
?
Содержание siprotec 7SA522
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