Siemens SIPROTEC 7RW80 User Manual

Functions
2.7 SYNCHROCHECK 25
SIPROTEC, 7RW80, Manual
C53000-G1140-C233-1, Release date 10.2010
92
2.7.3 De-energized Switching
Connecting two components of a power system is also possible if at least one of the components is de-ener-
gized and if the measured voltage is greater than the threshold 6106 V>. With a multi-phase connection on the
side V
1
, all connected voltages must have a higher value than the threshold V> so that the side V
1
is considered
as being energized. With a single-phase connection, of course, only the one voltage has to exceed the thresh-
old value.
Besides the release under synchronous conditions, the following additional release conditions can be selected
for the check:
SYNC V1>V2< = Release on the condition that component V
1
is energized and component V
2
is de-energized.
SYNC V1<V2> = Release on the condition that component V
1
is de-energized and component
V
2
is energized.
SYNC V1<V2< = Release on the condition that component V
1
and component V
2
are de-en-
ergized.
Each of these conditions can be enabled or disabled individually via parameters or binary inputs; combinations
are thus also possible (e.g. release if SYNC V1>V2< or
SYNC V1<V2> are fulfilled).
For that reason synchronization with the use of the additional parameter 6113 25 Synchron (configured to
NO) can also be used for the connection of a ground electrode. In such a case, connection is only permissible
when there is no voltage on the load side.
The threshold below which a power system component is considered as being de-energized is defined by pa-
rameter V<. If the measured voltage exceeds the threshold V>, a power system component is considered as
being energized. With a multi-phase connection on the side V
1
, all connected voltages must have a higher
value than the threshold V> so that the side V
1
is considered as being energized. With a single-phase connec-
tion, of course, only the one voltage has to exceed the threshold value.
Before granting a release for connecting the energized component V
1
and the de-energized component V
2
, the
following conditions are checked:
• Is the reference voltage V
1
above the setting value Vmin and V> but below the maximum voltage Vmax?
• Is the voltage to be synchronized V
2
below the setting valueV<?
• Is the frequency f
1
within the permissible operating range f
Nom
± 3 Hz?
After successful completion of the checks, the release is granted.
For connecting the de-energized component 1 to the energized component 2 or the de-energized component
1 to the de-energized component 2, the conditions to be fulfilled correspond to those stated above.
The associated messages indicating the release via the corresponding condition are as follows: „25 V1>
V2<“, „25 V1< V2>“ and „25 V1< V2<“.
Via the binary inputs „>25 V1>V2<“, „>25 V1<V2>“ and „>25 V1<V2<“, the release conditions can also
be issued externally, provided the synchronization is controlled externally.
The parameter TSUP VOLTAGE (address 6111) can be set to configure a monitoring time which requires the
additional release conditions stated above to be present for de-energized connection before connection is al-
lowed.

Siemens SIPROTEC 7RW80 Specifications

General

Brand	Siemens
Model	SIPROTEC 7RW80
Category	Relays
Language	English