Siemens siprotec 7SA6 User Manual page 384

Functions
Synchronism
Check Conditions
before Automatic
Reclosure
Synchronism
Check Conditions
before Manual
Closing
6-202
Addresses  to  are relevant to the check conditions before automatic
reclosure of the circuit breaker. When setting the parameters for the internal automatic
reclosing function (Section 6.12.2) it was decided with which automatic reclosing cycle
synchronism and voltage check should be carried out.
Address  2SPRGH ZLWK $5 determines whether closing under asynchronous
system conditions is allowed. Set this parameter to ZLWK 7&% FORVH, if
asynchronous closing shall be allowed; the relay will then consider the circuit breaker
closing time before determining the correct instant for the closing command.
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 automatic reclosure only under synchronous system conditions, set this
address to
ZR 7&% FORVH.
The permissible magnitude difference of the voltages is set under address  0D[
9ROW 'LII. Setting is in volts secondary. When operating the device from a
personal computer using DIGSI
Depending on the connection of the bus-bar voltage (phase–phase or phase–earth)
the phase–phase or the phase–earth voltage is decisive.
The permissible frequency difference between the voltages is set under address 
0D[ )UHT 'LII, the permissible phase angle difference under address 
0D[ $QJOH 'LII.
The further release conditions for automatic reclosing are set under addresses $
to  :
$ 6<1&&+(&.
 8V\QF! 8OLQH
 8V\QF 8OLQH!
 8V\QF 8OLQH
 29(55,'(
The five possible release conditions are independent of each other and can be
combined.
The release conditions for manual closing are set under addresses  to  .
When setting the general protection data (Power System Data 2, Section 6.1.3) it was
decided whether synchronism and voltage check should be carried out before manual
closing. With the following setting in address  6<10$1&/ = ZR 6\QF
®
4, setting may be in secondary or primary values.
= synchronism check: the bus-bar (Ubus) and the
feeder (Uline) must both be live (/LYH 9ROW
7KU, address ); the conditions for
synchronism 0D[ 9ROW 'LII (address ),
0D[ )UHT 'LII (address ), and 0D[
$QJOH 'LII (address ) are checked before
automatic reclosure;
= dead-line check: the bus-bar (Ubus) must be live
(/LYH 9ROW 7KU, refer to address ), the
feeder (Uline) must be dead ('HDG 9ROW 7KU,
refer to address );
= dead-bus check: the bus-bar (Ubus) must be dead
('HDG 9ROW 7KU, refer to address ), the
feeder (Uline) must be live (/LYH 9ROW 7KU,
refer to address );
= dead-bus and dead-line check: the bus-bar (Ubus)
and the feeder (Uline) must both be dead ('HDG
9ROW 7KU, refer to address );
automatic reclosure is released without any check.
7SA6 Manual
C53000-G1176-C133-1