ABB RER620, Technical Manual

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Section 5
1MAC309294-MB F
Control functions
330 RER620
Technical Manual
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.