ABB RELION REX640 Technical Manual page 1397

1MRS759142 C
REX640
Technical Manual
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, the
Synchro check function delivers a closing signal to the circuit breaker after the
command signal is delivered for closing.
Closing
request
CBXCBR
GUID-58CEAB07-7783-406A-A216-7F7C820D91C8 V1 EN
Figure 742: A simplified block diagram of SECRSYN 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.
Closing
request
CBXCBR
GUID-D783160F-B030-4DD0-8D00-BCAD04B497D0 V1 EN
Figure 743: Determination of the pulse length of the closing signal
In the command control mode operation, there are alarms for a failed closing attempt
(CL_FAIL_AL) and for a command signal that remains active too long
(CMD_FAIL_AL).
If the conditions for closing are not fulfilled within the set time of Maximum Syn time,
a failed closing attempt alarm is given. The CL_FAIL_AL alarm output signal is
pulse-shaped and the pulse length is 500 ms. If the external command signal is
removed too early, that is, before conditions are fulfilled and the closing pulse is
given, the alarm timer is reset.
Closing
command
SECRSYN
Closing
command
SECRSYN
Section 9
Control functions
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