Application - ABB RELION REX640 Technical Manual

1MRS759142 C
9.7.6
REX640
Technical Manual
CB closing is permitted during Maximum Syn time, starting from the moment the close
command is activated. The close command must be active while the closing
conditions are fulfilled, otherwise the procedure is cancelled. If the closing conditions
are fulfilled during Maximum Syn time, a closing pulse output is delivered to the CB.
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.
CBXCBR receives information about the CB status and thus is able to adjust the
command signal to be delivered to ASNSCSYN. 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-FB989EC0-DDD9-4480-8255-3EACCC15ABD5 V1 EN
Figure 774: Determination of the alarm limit for a still-active command signal
The binary input BLOCK can be used to block the function. The activation of the
BLOCK input deactivates all binary outputs and resets the internal timers.

Application

A circuit breaker is used to connect two different power networks. It is essential to
ensure that these power networks are synchronized before closing the CB, otherwise
it may lead to disturbances in the power system, causing stress and damage to the
connected equipment.
ASNSCSYN can be used for the synchronization of any bus coupler or tie feeder CB.
It checks for the synchronization conditions across the CB and releases the CB closing
command. If these conditions are not fulfilled, the sources in the power network
connected across this bus coupler or tie feeder CB have to change their operating
points to meet the requirements. This is achieved with Autosynchronizer co-ordinator
ASCGAPC available with the source (ASGCSYN) function and non-source
(ASNSCSYN) function.
Section 9
Control functions
t = 5 s
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