Siemens siprotec 7SA6 User Manual

Functions
6-202 7SA6 Manual
C53000-G1176-C133-1
Synchronism
Check Conditions
before Automatic
Reclosure
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 2SPRGHZLWK$5 determines whether closing under asynchronous
system conditions is allowed. Set this parameter to ZLWK7&%FORVH, if
asynchronous closing shall be allowed; the relay will then consider the circuit breaker
closing time before determining the correct instant for the closing command.
Remember that closing under asynchronous system conditions is allowed only if the
circuit breaker closing time is set correctly (see above under Preconditions)! If you
wish to permit automatic reclosure only under synchronous system conditions, set this
address to
ZR7&%FORVH.
The permissible magnitude difference of the voltages is set under address  0D[
9ROW'LII. Setting is in volts secondary. When operating the device from a
personal computer using DIGSI
®
4, setting may be in secondary or primary values.
Depending on the connection of the bus-bar voltage (phase–phase or phase–earth)
the phase–phase or the phase–earth voltage is decisive.
The permissible frequency difference between the voltages is set under address 
0D[)UHT'LII, the permissible phase angle difference under address 
0D[$QJOH'LII.
The further release conditions for automatic reclosing are set under addresses $
to :
$ 6<1&&+(&. = 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;
 8V\QF!8OLQH = 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 );
 8V\QF8OLQH! = 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 );
 8V\QF8OLQH = dead-bus and dead-line check: the bus-bar (Ubus)
and the feeder (Uline) must both be dead ('HDG
9ROW7KU, refer to address );
 29(55,'( automatic reclosure is released without any check.
The five possible release conditions are independent of each other and can be
combined.
Synchronism
Check Conditions
before Manual
Closing
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<10$1&/ = ZR6\QF

Siemens siprotec 7SA6 Specifications

General

Brand	Siemens
Model	siprotec 7SA6
Category	Relays
Language	English