Siemens siprotec 7SA522 User Manual

2 Functions
264
7SA522 Manual
C53000-G1176-C155-3
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.
General 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 µ, 637 ´8OLQH µ
,638 ´8EXV µ, 647 ´)GLII µ, 649 ´)OLQH µ, 646 ´)EXV µ, and 648
´ 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ZR
&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
®
. Depending on the con-
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
®
. Depending
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 76<1'85$7,21 (address ). The con-

Siemens siprotec 7SA522 Specifications

General

Brand	Siemens
Model	siprotec 7SA522
Category	Protection Device
Language	English