differences presented in the monitored data view. These values should be within
the permitted tolerances, that is, close to zero.
shows an example where the synchrocheck is used for the circuit breaker
closing between a busbar and a line. The phase-to-phase voltages are measured
from the busbar and also one phase-to-phase voltage from the line is measured.
Figure 533: Connection of voltages for the protection relay and signals used in
synchrocheck
9.3.6
Signals
Table 994: SECRSYN Input signals
Name
Type
Default
Description
U_BUS
SIGNAL
0
Busbar voltage
U_LINE
SIGNAL
0
Line voltage
BLOCK
BOOLEAN
0=False
Blocking signal of the synchro
check and voltage check function
CL_COMMAND
BOOLEAN
0=False
External closing request
BYPASS
BOOLEAN
0=False
Request to bypass synchronism
check and voltage check
Control functions
1MRS757644 H
1008
620 series
Technical Manual
