4–412 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
FLEXLOGIC CHAPTER 4: SETPOINTS
NOTE:
If Phase to Phase mode is selected in this protection element, in “EVENT DESCRIPTION”
column, “Phase A” becomes “Voltage AB”, “Phase B” becomes “Voltage BC” and “Phase C”
becomes “Voltage CA”.
Some operands can be re-named by the user. These are the names of the breakers in the
breaker control feature, the ID (identification) of contact inputs, the ID of virtual inputs, and
the ID of virtual outputs. If the user changes the default name or ID of any of these
operands, the assigned name will appear in the relay list of operands. The default names
are shown in the FlexLogic Operands table above.
Table 4-40: 850 FlexLogic Operators
Virtual Outputs 1 to 32 VO # ON
VO # OFF
Flag is set, logic = 1
Flag is set, logic=0
VT Fuse Failure VT Fuse Fail1 OP
VT Fuse1 V Loss
VT fuse failure detector 1 has operated
VT fuse 1 failure has lost voltage signals (V2 below 10% AND V1 below 5%
of nominal)
Wattmetric Ground Fault Watt GndFlt 1 PKP
Watt GndFlt 1 OP
Wattmetric directional element 1 has picked up
Wattmetric directional element 1 has operated
ELEMENT OPERANDS EVENT DESCRIPTION
TYPE SYNTAX DESCRIPTION NOTES
Editor INSERT Insert a parameter in an
equation list.
DELETE Delete a parameter from
an equation list.
End END The first END
encountered signifies
the last entry in the list of
processed FlexLogic™
parameters.
One-shot POSITIVE ONE SHOT One shot that responds
to a positive going edge.
A ‘one shot’ refers to a
single input gate that
generates a pulse
response to an edge on
the input. The output
from a ‘one shot’ is True
(positive) for only one
pass through the
FlexLogic equation. There
is a maximum of 64 ‘one
shots’.
NEGATIVE ONE
SHOT
One shot that responds
to a negative going
edge.
DUAL ONE SHOT One shot that responds
to both the positive and
negative going edges.
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