De-Energized Switching - Siemens SIPROTEC 4 Manual

Functions
2.20 Synchrocheck
The measurement of the the synchronism conditions can be confined to the a maximum monitoring time T-
SYN. DURATION. If the conditions are not met within T-SYN. DURATION, the release is cancelled (message
25 MonTimeExc ). A new synchronization can only be performed if a new measurement request is received.
Operating Range
The operating range of the synchrocheck function is defined by the configured voltage limits Vmin and Vmax
as well as the fixed frequency band f
If the measurement is started and one of or both voltages are outside the operating range or one of the
voltages leaves the operating range, this is indicated by corresponding messages (
V1>>, 25 V1<< ).
Measured Values
The measured values of the synchrocheck function are displayed in separate windows for primary, secondary
and percentaged measured values. The measured values are displayed and updated only while the synchro-
check function is requested.
The following is displayed:
•
Value of the reference voltage V
•
Value of the voltage to be synchronized V
•
Frequency values f
•
Differences of voltage, frequency and angle.

De-energized Switching

2.20.3
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 , all connected voltages must have a higher value than the threshold V> so that the side V
1
considered as being energized. With a single-phase connection, of course, only the one voltage has to exceed
the threshold value.
Besides the release under synchronous conditions, the following additional release conditions can be selected
for the check:
SYNC V1>V2< =
SYNC V1<V2> =
SYNC V1<V2< =
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
parameter 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
value than the threshold V> so that the side V
tion, of course, only the one voltage has to exceed the threshold value.
Before granting a release for connecting the energized component V
the following conditions are checked:
264
± 3 Hz
Nom
1
2
and f
1 2
Release on the condition that component V
energized.
Release on the condition that component V
energized.
Release on the condition that component V
is considered as being energized. With a single-phase connec-
1
25 f1>>, 25 f1<<, 25
is energized and component V
1
is de-energized and component V
1
and component V
1
, all connected voltages must have a higher
1
and the de-energized component V
1
SIPROTEC 4, 7SJ80, Manual
E50417-G1140-C343-A8, Edition 12.2017
is
1
is de-
2
is
2
are de-energized.
2
,
2