Siemens siprotec 7SA522 User Manual

2 Functions
266
7SA522 Manual
C53000-G1176-C155-3
Synchronism
Check Conditions
before Manual
Closing
Addresses  to  are relevant to the check conditions before manual closure
and closing via control command of the circuit breaker. When setting the general pro-
tection data (Power System Data 2, Section 2.1.5.1) it was already decided at address
 whether synchronism and voltage check should be carried out before manual
closing. With the following setting in address 0$1&/26( = ZR6\QFFKHFN, no
checks are performed before manual closing.
Address  6\QF&% determines for commands via the integrated control function
(local, DIGSI, serial interface) whether synchronism check is carried out or not. This
address also tells the device for which switching device of the control the synchronism
check applies. You can select from the switching devices which are available for the
integrated control. Choose the circuit breaker to be operated via the synchronism
check. This is usually the circuit breaker which is operated in case of manual closing
or automatic reclosure. If you set 6\QF&% = QRQH here, a CLOSE command via the
integrated control will be carried out without synchronism check.
Address  2SPRGHZLWK0& determines whether closing under asynchronous
system conditions is allowed for manual closing or reclosure via control command. Set
this parameter to ZLWK7&%FORVH to allow asynchronous closing; the relay will
then consider the circuit breaker closing time before determining the correct instant for
the close command. Remember that closing under asynchronous system conditions
is allowed only if the circuit breaker closing time is set correctly (see above under “Pre-
conditions”)! If you wish to permit manual closure or closing via control command only
under synchronous system conditions, set this address to ZR7&%FORVH.
The permissible magnitude difference of the voltages is set at address  0&
PD[9ROW'LII. The setting is applied in Volts secondary. This value can be entered
as a primary value when parameterizing with a PC and DIGSI
®
. Depending on the con-
nection of the voltages these are phase-to-earth voltages or phase-to-phase voltages.
The permissible frequency difference between the voltages is set at address  0&
PD[)UHT'LII, the permissible phase angle difference at address  0&
PD[$QJOH'LII.
The further release conditions for manual reclosing or reclosure via control command
are set under addresses  to .
The following addresses mean:
 0&6<1&+5 the busbar (Ubus) and the feeder (Uline) must both be
energized (/LYH9ROW7KU, address ); the
conditions for synchronism are checked i.e., 0&
PD[9ROW'LII (address ), 0&
PD[)UHT'LII(address ) and 0&
PD[$QJOH'LII (address ); This setting is only
possible via DIGSI
®
under Additional Settings.
 0&8V\Q!8OLQH the busbar (Ubus) must be live (/LYH9ROW7KU,
address ), the feeder (Uline) must be dead ('HDG
9ROW7KU, address );
 0&8V\Q8OLQH! the busbar (Ubus) must be dead ('HDG9ROW7KU,
address ), the feeder (Uline) must be live (/LYH
9ROW7KU, address );
 0&8V\Q8OLQH the busbar (Ubus) and the feeder (Uline) must both be
de-energized ('HDG9ROW7KU, address );
 0&25,'( manual closing or closing via control command is re-
leased without any check.

Siemens siprotec 7SA522 Specifications

General

Brand	Siemens
Model	siprotec 7SA522
Category	Protection Device
Language	English