ABB 615 Series ANSI, Техническое руководство, Страница: 528 / 713

1MAC050144-MB C
Section 7
Control functions
615 series ANSI 521
Technical Manual
sides of the circuit breaker have the same frequency and are in phase with a magnitude that
makes the concerned busbars or lines can be regarded as live.
In the command control mode operation, an external command signal CL_COMMAND,
besides the normal closing conditions, is needed for delivering the closing signal. In the
command control mode operation, the synchrocheck function itself closes the breaker via
the SYNC_OK output when the conditions are fulfilled. In this case, the control function
block delivers the command signal to close the synchrocheck function for the releasing of
a closing signal pulse to the circuit breaker. If the closing conditions are fulfilled during a
permitted check time set with
Maximum Syn time , after the command signal is delivered
for closing, the synchrocheck function delivers a closing signal to the circuit breaker.
Figure 284: A simplified block diagram of the synchrocheck function in the command
mode operation
The closing signal is delivered only once for each activated external closing command
signal. The pulse length of the delivered closing is set with the Close pulse setting.
Figure 285: Determination of the pulse length of the closing signal
25 52
I
Closing
request
Closing
command