Close pulse
Maximum Syn time
5s
Figure 320: 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 a new closing-command sequence cannot be started
until the external command signal is reset and reactivated. 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 to the bypass mode by setting the parameters
Synchrocheck
mode
and
Live dead mode
to "Off" or alternatively by activating the BYPASS input.
In the bypass mode, the closing conditions are always considered to be fulfilled by
SECRSYN. 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.
1MRS758755 C
Control functions
REC615 & RER615
Technical Manual
649
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