14.3.9.7 Command response evaluation
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The command evaluation is triggered through the group input XIN that is connected to the SCSWI
function controlling the switch.
If an operation is initiated by the SCSWI, the XLNPROXY function checks if the switch is blocked
for the operation direction and that the position moves to the desired position within the two
time limits
tStartMove
and
tIntermediate
. The default values for
tStartMove
and
tIntermediate
are
for a breaker. The typical values for a disconnector are:
•
tStartMove
= 3s
•
tIntermediate
= 15s
In most cases,
tStartMove
and
tIntermediate
can be set to the same values as in
the source XCBR or XSWI function. However, if the time limits are set very close to
the actual movement times of the apparatus, compensation may be needed for the
communication delays and differences in cycle time of the XLNPROXY function and
the source function. The compensation should be in the range of 0 - 5ms.
When the switch has started moving, it issues a response to the SCSWI function that the operation
has started. If it does not start moving within
tStartMove
, the command is deemed as failed, and a
cause is raised on the L_CAUSE output and sent to the SCSWI. The different causes it can identify
are listed in order of priority in table 1. The detection of the different ways of blocking is done
while waiting for movement of the switch, but the cause is not given until the
tStartMove
has
elapsed.
Table 500: Possible cause values from XLNPROXY
Cause No Cause Description Conditions
8 Blocked-by-Mode The BEH input is 5.
2 Blocked-by-switching-
hierarchy
The LOC input indicates that only local commands
are allowed for the breaker IED function.
-24 Blocked-for-open-cmd The BLKOPN is active indicating that the switch is
blocked for open commands.
-25 Blocked-for-close-cmd The BLKCLS is active indicating that the switch is
blocked for close commands.
9 Blocked-by-process If the Blk input is connected and active indicating
that the switch is dynamically blocked. Or if the
OPCAP input is connected, it indicates that the
operation capability of the switch is not enough to
perform the command.
5 Position-reached Switch is already in the intended position.
-31 Switch-not-start-moving Switch did not start moving within tStartMove.
-32 Persistent-intermediate-state The switch stopped in intermediate state for longer
than tIntermediate.
-33 Switch-returned-to-init-pos Switch returned to the initial position.
-34 Switch-in-bad-state Switch is in a bad position.
-35 Not-expected-final-position Switch did not reach the expected final position.
The L_CAUSE output keeps its output value until a new command sequence has been started.
1MRK 502 066-UUS B Section 14
Control
859
Technical manual
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