Monitoring & Control
PRS-7367 245
Input signal of start Sync command
Voltage of system side and line side
Table 5.2-2 Output Signals
ENERGCHK Condition is met
ORDINARY Condition is met
Alarm signal of voltage difference is not satisfied
Alarm signal of frequency difference is not satisfied
Alarm signal of angle difference is not satisfied
Alarm signal of frequency change difference is not satisfied
Alarm signal of Closing angle is not satisfied
Alarm signal of Non-co-frequency system
Alarm signal of Synchronous voltage abnormal
Alarm signal of Synchronous frequency abnormal
5.2.2 SYN Operation Principle
Energy Check
The voltage selection includes the selection of appropriate line and bus voltages depending on the
type of system configuration. The module includes a fuse supervision feature which supervises the
voltage transformer fuses for the selected voltage transformer.
The dead charge check conditions have three types: live-bus and dead-line check(LBDL),
dead-bus and live-line check(DBLL) and dead-bus and dead-line check(DBDL). The above three
modes can be enabled and disabled by the corresponding logic settings. The device can calculate
the measured bus voltage and line voltage at both sides of the circuit breaker and compare them
with the settings. When the voltage is higher than Sync_LINVOL, the bus/line is regarded as live.
When the voltage is lower than Sync_NOVOL, the bus/line is regarded as dead.
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