De-Energized Switching - Siemens siprotec SJ62 User Manual

2.19.1.4 De-energized Switching

SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
When the check has been terminated successfully, the device determines the next
instant at which the two systems are in phase from the angle difference and the fre-
quency difference. The ON command is issued at this instant minus the operating time
of the circuit breaker.
Connecting two components of a power system is also possible if at least one of the
components is de-energized and if the measured voltage is greater than the threshold
6106 V>. Thus, with a multiple-phase connection at side V
have a higher value than threshold V> so that side V
single-phase connection, of course, only one voltage has to exceed the threshold
value.
Besides release under synchronous conditions, the following additional release con-
ditions 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; combinations are
also possible (e.g., release if SYNC V1>V2< or SYNC V1<V2> are fulfilled).
Synchronization thus takes place by involving the additional parameter 6x13 25
Synchron (set to NO) also, e.g. for connecting a ground switch. In such a case, the
switch may only be connected if no voltage applies on load side, i.e. connection is not
permitted under synchronous conditions.
The release conditions can be configured individually either for automatic reclosing or
for manual closing via control commands. You can, for example, allow manual closing
for synchronism or for de-energized feeder whereas before an automatic reclosing op-
eration, checking only de-energized conditions at one feeder terminal and afterwards
only synchronism at the other.
The threshold below which a power system component is considered as de-energized
is defined by parameter V<. If the measured voltage exceeds the threshold V>, a
power system component is energized. Thus, with a multiple-phase connection at side
all three voltages must have a higher value than threshold V> so that side V
V
1
ognized as energized. With single-phase connection, of course, only one voltage has
to exceed the threshold value.
Before granting a release for connecting the energized component V
ergized component V
2,
• Is the reference voltage V
maximum voltage Vmax?
• Is the voltage to be synchronized V
• Is the frequency f within the permitted operating range f
1
After successful termination of the check the release is granted.
For switching the de-energized component 1 to the energized component 2 or con-
necting the de-energized component 1 to the equally de-energized component 2 the
conditions to be fulfilled correspond with those stated above.
2.19 Synchronism and Voltage Check 25 (7SJ64 only)
Release on the condition that component V
gized and component V
Release on the condition that component V
ergized and component V
Release on the condition stating that component V
and component V
the following conditions are checked:
above the setting value Vmin and V> but below the
1
below the threshold V<?
2
all three voltages must
1
is recognized as energized. With
1
is de-energized.
2
is energized.
2
are de-energized.
2
and the de-en-
1
± 3 Hz?
Nom
is ener-
1
is de-en-
1
1
is rec-
1
288