The closing angle is the estimated angle difference after the breaker closing delay.
The
Minimum Syn time
setting time can be set, if required, to demand the minimum
time within which conditions must be simultaneously fulfilled before the SYNC_OK
output is activated.
The measured voltage, frequency and phase angle difference values between
the two sides of the circuit breaker are available as monitored data values
U_DIFF_MEAS, FR_DIFF_MEAS and PH_DIFF_MEAS. Also, the indications of the
conditions that are not fulfilled and thus preventing the breaker closing
permission are available as monitored data values U_DIFF_SYNC, PH_DIF_SYNC
and FR_DIFF_SYNC. These monitored data values are updated only when the
Synchro check is enabled with the
Synchro check mode
setting and the measured
ENERG_STATE is "Both Live".
Continuous mode
The continuous mode is activated by setting the parameter
Control mode
to
"Continuous". In the continuous control mode, Synchro check is continuously
checking the synchronism. When synchronism is detected (according to the
settings), the SYNC_OK output is set to TRUE (logic '1') and it stays TRUE as long as
the conditions are fulfilled. The command input is ignored in the continuous control
mode.
SECRSYN CBXCBR
I
Closing
permission
Closing
command
Figure 845: A simplified block diagram of the Synchro check function in the
continuous mode operation
Command mode
If
Control mode
is set to "Command", the purpose of the Synchro check
functionality in the command mode is to find the instant when the voltages on both
sides of the circuit breaker are in synchronism. The conditions for synchronism are
met when the voltages on both sides of the circuit breaker have the same frequency
and are in phase with a magnitude that makes the concerned busbars or lines such
that they can be regarded as live.
In the command mode operation, an external command signal CL_COMMAND
(initiated by the breaker function CBXCBR output CL_REQ), in addition to the normal
closing conditions, is needed for delivering the SYNC_OK signal for the breaker
function input SYNC_OK. If the closing conditions are fulfilled during a permitted
check time set with
Maximum Syn time
, the Synchro check function delivers a
SYNC_OK signal to the circuit breaker function after the command signal is delivered
for closing.
Control functions
1MRS759142 F
1548 REX640
Technical Manual
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