ABB RELION REX640 Technical Manual page 1417

1MRS759142 C
REX640
Technical Manual
circuit breaker. If the closing conditions are not fulfilled during the checking time, the
alarm CL_FAIL_AL is activated as an indication of a failed closing attempt. The
closing pulse is not delivered if the closing conditions become valid after Maximum
Syn time has elapsed. The closing pulse is delivered only once for each activated close
command, and a new closing command sequence cannot be started until the close
command is reset and reactivated.
The circuit breaker control function block receives information about the circuit
breaker status and thus is able to adjust the command signal to be delivered to
ASGCSYN. If the closing command is active longer than necessary, the
CMD_FAIL_AL alarm output is activated. To avoid unnecessary alarms, the
maximum length of the closing command signal should be below Maximum Syn time
+ 5 s.
CL_COMMAND or
Synchronize CB
t = Maximum Syn time
CLOSE_CB
CMD_FAIL_AL
GUID-C577B079-D4CA-478C-89D9-D34652899498 V1 EN
Figure 758: Determination of the alarm limit for a still-active command signal
Voltage and frequency matching
The operation of the Voltage and frequency matching module can be described with
a module diagram. All the modules in the diagram are explained in the next sections.
Section 9
Control functions
t = 5 s
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