Siemens siprotec 7SA522 User Manual

2.14 Synchronism and voltage check (optional)
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7SA522 Manual
C53000-G1176-C155-3
figured conditions must be fulfilled within this time. If not, closure will not be released.
If this time is set to ∞, the conditions will be checked until they are fulfilled or the mea-
surement request is cancelled.
If the conditions for synchronous
operation must be checked to be maintained for a
certain duration, this minimum duration 76<1&67$% can be set under address
 before closing is released.
Synchronism
Check Conditions
before Automatic
Reclosure
Addresses  to  are relevant to the check conditions before automatic reclo-
sure of the circuit breaker. When setting the parameters for the internal automatic re-
closing function (Section 2.13.2) it is 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 for automatic reclosure. Set this parameter to ZLWK7
&%FORVH to allow asynchronous closing; the relay will then consider the circuit
breaker operating 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 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 at address  0D[
9ROW'LII. The setting is applied in Volts secondary. This value can be entered as
a primary value when parameterizing with a PC and DIGSI
®
. Depending on the con-
nection of the voltages these are phase-to-earth voltages or phase-to-phase voltages.
The permissible frequency difference between the voltages is set at address 
0D[)UHT'LII, the permissible phase angle difference at address  0D[
$QJOH'LII.
The further release conditions for automatic reclosing are set at addresses  to
.
The following addresses mean:
 6<1&&+(&. the busbar (Ubus) and the feeder (Uline) must both be
live (/LYH9ROW7KU, address ); the condi-
tions for synchronism are checked i.e., 0D[9ROW
'LII (address ), 0D[)UHT'LII(address
) and 0D[$QJOH'LII (address );
 8V\QF!8OLQH the busbar (Ubus) must be live (/LYH9ROW7KU,
address ), the feeder (Uline) must be dead ('HDG
9ROW7KU, address );
 8V\QF8OLQH! the busbar (Ubus) must be dead ('HDG9ROW7KU,
address ), the feeder (Uline) must be live (/LYH
9ROW7KU, address );
 8V\QF8OLQH the busbar (Ubus) and the feeder (Uline) must both be
de-energized ('HDG9ROW7KU, address );
 29(55,'( automatic reclosure is released without any check.
The five possible release conditions are independent of each other and can be com-
bined.

Siemens siprotec 7SA522 Specifications

General

Brand	Siemens
Model	siprotec 7SA522
Category	Protection Device
Language	English