ABB RED650 Technical Manual page 371

1MRK 505 394-UEN A
Line differential protection RED650 2.2 IEC
Technical manual
client
IEC15000417 V1 EN-US
Figure 172: Example of command sequence for a successful close command
when the control model direct with normal security is used
Normal security means that only the command is evaluated and the resulting
position is not supervised. Enhanced security means that the command sequence is
supervised in three steps, the selection, command evaluation and the supervision of
position. Each step ends up with a pulsed signal to indicate that the respective step
in the command sequence is finished. If an error occurs in one of the steps in the
command sequence, the sequence is terminated. The last error (L_CAUSE) can be
read from the function block and used for example at commissioning.
There is no relation between the command direction and the actual
position. For example, if the switch is in closed position it is
possible to execute a close command.
Before an execution command, an evaluation of the position is done. If the
parameter PosDependent is true and the position is in intermediate state or in bad
state no execution command is sent. If the parameter is false the execution
command is sent independent of the position value.
Evaluation of position
The position output from the switch (SXCBR) is connected to the switch controller
SCSWI. The XPOSL1, XPOSL2 and XPOSL3 input signals receive the position,
time stamps and quality attributes of the position which is used for further
evaluation.
In the case when there are two or more one-phase switches connected to the switch
control function, the switch control will "merge" the position of the switches to the
resulting multi-phase position. In the case when the position differ between the
one-phase switches, following principles will be applied:
Reservation
core
requestedPosition = 10
opRcvd = TRUE
RES_RQ
RES_GRT = TRUE
opOK = TRUE, tOpOk
operateAck/AddCause = 0
POSITION = 00, timeStamp
POSITION = 10, timeStamp
RES_RQ = FALSE
RES_GRT = FALSE
Section 12
Control
SwitchCtrl Switch
core
EXE_CL
operateAck/AddCause = 0
POSITION = 00, timeStamp
POSITION = 10, timeStamp
cmdTermination/
AddCause = 0
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