CYG PRS-7367 - Logic

Protection Functions
130 PRS-7367
U is the voltage
syn
U
or
ref
U
.
25SYN_Vol_Dd is the setting of Voltage threshold of dead check.
the bus/line live criterion is:
U>25SYN_Vol_Lv
Where:
is the voltage
syn
U
or
ref
U
.
25SYN_Vol_Lv is the setting of voltage threshold of live check.
3.23.2.3 Synchronism Check Logic
The voltage difference criterion is:
syn ref
U U 25SYN_Vol_Diff
The phase difference criterion is:
syn
ref
U
arg 25SYN_Ang_Diff
U

The frequency difference criterion is:
   
syn ref
f U -f U 25SYN_Fr_Diff
Where:
25SYN_Vol_Diff is the setting of voltage difference limit.
25SYN_Ang_Diff is the setting of phase difference limit.
25SYN_Fr_Diff is the setting of frequency difference limit.
3.23.3 Logic
The dead charge check conditions have three types, namely, live-bus and dead-line check,
dead-bus and live-line check and dead-bus and dead-line check. 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 25SYN_Vol_Lv, the bus/line is regarded as live. When
the voltage is lower than 25SYN_Vol_Dd, the bus/line is regarded as dead.