Siemens SIPROTEC 7SA522 Manual page 264

2 Functions
General
264
WARNING!
Closing at Asynchronous System Conditions!
Closing at asynchronous system conditions requires the closing time of the circuit
breaker to be set correctly in the Power system data 1 (address  ).
Otherwise, faulty synchronization may occur.
The synchronism check function can only operate if it was configured as (QDEOHG
(address ) and 8 WUDQVIRUPHU as 8V\QF WUDQVI (address ) during con-
figuration of the functional scope.
The measured values of the synchronism check (636 ´8GLII
,638 ´8EXV µ, 647 ´)GLII µ, 649 ´)OLQH µ, 646 ´)EXV
´ ϕGLI µ)are only available or will be only calculated, if the synchronism check was
set to (QDEOHG and the parameter 8 WUDQVIRUPHU(address ) has been set to
8V\QF WUDQVI.
Different interrogation conditions can be parameterized for automatic reclosure on the
one hand and for manual closure on the other hand. Each closing command is con-
sidered a manual reclosure if it was initiated via the integrated control function or via
a serial interface.
The general limit values for synchronism check are set at address  to . Ad-
ditionally, addresses  to  are relevant for automatic reclosure, addresses
 to  are relevant for manual closure. Moreover, address  is relevant for
closure via the integrated control function.
The complete synchronism check function is switched 21 or 2)) under address 
)&7 6\QFKURQLVP. If switched off, the synchronism check does not verify the syn-
chronization conditions and release is not granted. You can also set 21 ZR
&ORVH&PG: In this case, the close command is not integrated in the device indication
´5HOD\ &/26(µ (FNo 510), but the message ´6\QF&ORVH&PGµ (FNo 2961) is
generated.
Address  'HDG 9ROW 7KU indicates the voltage threshold below which the
feeder or the busbar can safely be considered dead (for checking a de-energized
feeder or busbar). The setting is applied in Volts secondary. This value can be entered
as a primary value when parameterizing with a PC and DIGSI
nection of the voltages these are phase-to-earth voltages or phase-to-phase voltages.
The voltage above which the feeder or busbar is regarded as being definitely live, is
set under address  /LYH 9ROW 7KU (for energized line or busbar check and
for the lower limit of synchronism check). It must be set below the anticipated opera-
tional undervoltage. The setting is applied in Volts secondary. This value can be
entered as a primary value when parameterizing with a PC and DIGSI
on the connection of the voltages these are phase-to-earth voltages or phase-to-
phase voltages.
The maximum permissible voltage for the operating range of the synchronism check
function is set under address  8PD[. 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 connection of the voltages these are phase-to-earth volt-
ages or phase-to-phase voltages.
Verification of the release conditions via synchronism check can be limited to a con-
figurable synchronous monitoring time 76<1 '85$7,21 (address ). The con-
µ, 637 ´8OLQH µ
µ, and 648
®
. Depending on the con-
®
. Depending
7SA522 Manual
C53000-G1176-C155-3