Siemens SIPROTEC 4 7VK61 Manual page 92

Functions
2.4 Synchronism and voltage check (optional)
allow asynchronous closing; the relay will then consider the circuit breaker closing time before determining
the correct instant for closing. Remember that closing under asynchronous system conditions is allowed only
if the circuit breaker closing time is set correctly (see above under "Preconditions")! If you wish to permit
manual closure or closing via control command only under synchronous system conditions, set this address to
w/o T-CB close .
The permissible difference between the voltages is set in address 3531 MC maxVolt.Diff. The setting is
applied in Volts secondary. This value can be entered as a primary value when parameterising with a PC and
DIGSI. Depending on the VT connection these are phase-to-earth voltages or phase-to-phase voltages.
The permissible frequency difference between the voltages is set at address 3532 MC maxFreq.Diffthe
permissible phase angle difference at address 3533 MC maxAngleDiff.
The further release conditions for manual reclosing or reclosure via control command are set under addresses
3535 to 3539.
The following addresses mean:
3535 MC SYNCHR
3536 MC Usy1< Usy2>
3537 MC Usy1> Usy2<
3538 MC Usy1< Usy2<
3539 MC OVERRIDE
The five possible release conditions are independent of one another and can be combined.
NOTE
i
i
The closing functions of the device issue individual output indications for the corresponding close
command. Be sure that the output indications are assigned to the correct output relays.
No 2851 AR CLOSE Cmd. for CLOSE via command of the automatic reclosure,
No 562 Man.Close Cmd for manual CLOSE via binary input,
No. 2961 Sync.CloseCmd for CLOSE via synchronism check (not required if synchronism check releases
the other CLOSE commands),
No 7329 CB1-TEST close for CLOSE by circuit breaker test
additionally CLOSE command via control, e.g.
No 510 Relay CLOSE general CLOSE command. It comprises all CLOSE commands described above.
Connections
The 7VK61 provides three voltage inputs for connection of the reference voltage U
for the voltage U
the phase-to-earth voltages are always connected for U
phase-to-phase) are allowed for the single-phase connection of U
92
to be synchronized (see example in
sy2
both measuring points U
gized (Live Volt. Thr., address 3503); the
synchronism conditions are checked, i.e. MC
maxVolt.Diff (address 3531), MC maxFreq.Diff
(address 3532) and MC maxAngleDiff (address
3533). This parameter can only be altered in DIGSI at
Display Additional Settings;
the measuring point U
Volt. Thr., address 3502), the measuring point
U must be energized (Live Volt. Thr., address
sy2
3503) ;
the measuring point U
Volt. Thr., address 3503), the measuring point
U must be de-energized (Dead Volt. Thr.,
sy2
address 3502);
both measuring points U
gized ( Dead Volt. Thr., address 3502);
manual closing or closing via control command is
released without any check.
Brk Close
Figure 2-23). If the connection is to all three phases,
whereas all connection types (phase-to-earth,
sy1
. The latter holds also for the voltage U
sy1
C53000-G1176-C159-5, Edition 05.2018
and U must be ener-
sy1 sy2
must be de-energized Dead
sy1
must be energized (Live
sy1
and U must be de-ener-
sy1 sy2
and one voltage input
sy1
SIPROTEC 4, 7VK61, Manual
sy2