Alstom MiCOM P546 - 5.7.4 Dual circuit breaker system voltage synchronism checks (P544;P546)

Operation P54x/EN OP/La4
MiCOM P543, P544, P545 & P546 (OP) 5-203
OP
5.7.4 Dual circuit breaker system voltage synchronism checks (P544/P546)
Two synchronism check stages are provided for each circuit breaker to compare the line and
bus voltages when closing a circuit breaker.
Synchronism check logic is enabled or disabled per circuit breaker, by settings Sys Checks
CB1 to Enable or Disable, and Sys Checks CB2 to Enable, or Disable.
If System Checks CB1 is set to Disable, all other menu settings associated with system
checks and synchronism checks for CB1 become invisible, and a DDB (880) signal
SChksInactiveCB1 is set.
Similarly if System Checks CB2 is set to Disable, all other menu settings associated with
system checks and synchronism checks for CB2 become invisible, and a DDB (1484) signal
SChksInactiveCB2 is set.
Dead Volts
Live Volts
Nominal
Volts
Check Sync
Stage 2 Limits
Rotating
Vector
V
LINE
P2131ENa
Check Sync
Stage 1 Limits
0º
V
BUS
±180º
System Split
Limits
Figure 120 Synchro check functionality (P544/P546)
The overall check synchronism functionality is illustrated in Figure 120