Siemens siprotec 7SA522 - Page 335

Functions
6-1877SA522 Manual
C53000-G1176-C119-2
Address 2SPRGHZLWK0& determines whether closing under asynchronous
system conditions is allowed. Set this parameter to ZLWK7&%FORVH, if asynchro-
nous closing shall be allowed; the relay will then consider the circuit breaker closing
time before determining the correct instant for the close 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 only per-
mit manual closing under synchronous system conditions, set this address to ZR7
&%FORVH.
The permissible magnitude difference of the voltages is set under address  0&
PD[9ROW'LII. Setting is in volts secondary; when operating the device from a per-
sonal computer using DIGSI
®
4, setting may be in secondary or primary values. De-
pending 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 
0&PD[)UHT'LII, the permissible phase angle difference under address 0&
PD[$QJOH'LII.
The release conditions for manual closing are set under addresses $ to :
$ 0&6<1&+5 = synchronism check: the bus-bar (Ubus) and the
feeder (Uline) must both be live (/LYH9ROW
7KU, address ); the conditions for synchro-
nism 0&PD[9ROW'LII (address ), 0&
PD[)UHT'LII (address ), and 0&PD[$Q
JOH'LII (address ) are checked before man-
ual closure;
 0&8V\Q!8OLQH 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 );
 0&8V\Q8OLQH! 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, re-
fer to address );
 MC Usyn< Uline< = dead-bus and dead-line check: the bus-bar (Ubus) and
the feeder (Uline) must both be dead ('HDG9ROW
7KU, refer to address );
 0&25,'( = manual closing is released without any check.
The five possible release conditions are independent of each other and can be com-
bined.