CYG PRS-7367 - Page 136

Protection Functions
128 PRS-7367
time and improve the stability of the auto-reclose. 25SYN checks whether the activation is
permissible without a risk to the stability of the system when interconnecting 2 parts of an electrical
power system. Typical applications are the synchronization of a line and a bus bar.
3.23.1.1 Function Block
SYNC_25
U3P
ChkOK
DLDBOK
DLLBOK
LLDBOK
DdChkOK
VolDiffOK
FrDiffOK
AngDiffOK
Ux
Blk
SynChkBlk
DdChkBlk
SynChkOK
UsynVTSAlm
UsynPhsAlm
CB_Open
3.23.1.2 Signals
Table 3.23-1 25SYN Input Signals
NO.
Signal
Description
1
U3P
Three-phase voltage input
2
Ux
Synchronism voltage input
3
Blk
Block signal of synchro check function for AR
4
SynChkBlk
Block signal of synchronism check for AR
5
DdChkBlk
Block signal of dead charge check for AR
6
CB_Open
Normally closed contact of circuit breaker
Table 3.23-2 25SYN Output Signals
NO.
Signal
Description