ABB RER620 Technical Manual page 336

Section 5
Control functions
330
Figure 173: Determination of the alarm limit for a still-active command signal
Closing is permitted during Maximum Syn time, starting from the moment the external
command signal CL_COMMAND is activated. The CL_COMMAND input must be kept active
for the whole time that the closing conditions are waited to be fulfilled. Otherwise, the
procedure is cancelled. If the closing command conditions are fulfilled during Maximum
Syn time, a closing pulse is delivered to the 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 external command signal and new closing
command sequence cannot be started until the external command signal is reset and then
activated again. The SYNC_INPRO output is active when the closing command sequence
is in progress and it is reset when the CL_COMMAND input is reset or Maximum Syn time
has elapsed.
Bypass mode
SECRSYN can be set into bypass mode by setting the parameters Synch check mode and
Energizing check mode to "Off" or alternatively, by activating the BYPASS input.
In bypass mode, the closing conditions are always considered to be fulfilled by the
SECRSYN function. Otherwise, the operation is similar to the normal mode.
Voltage angle difference adjustment
In application where the power transformer is located between the voltage measurement
and the vector group connection gives phase difference to the voltages between the high
and low-voltage sides, the angle adjustment can be used to meet synchronism.
1MAC309294-MB F
RER620
Technical Manual