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5.6 GROUPED ELEMENTS
located close to the zone boundary when small oscillations in the voltages or currents could inadvertently reset the
timer. Zone 1 does not need any drop out delay since it is sealed-in by the presence of current.
•
PHS DIST Z1 BLK: This setting enables the user to select a FlexLogic™ operand to block a given distance element.
VT fuse fail detection is one of the applications for this setting.
FLEXLOGIC OPERAND
PH DIST Z1 PKP AB
FLEXLOGIC OPERAND
PH DIST Z1 PKP BC
FLEXLOGIC OPERAND
PH DIST Z1 PKP CA
FLEXLOGIC OPERANDS
PH DIST Z1 SUPN IAB
PH DIST Z1 SUPN IBC
PH DIST Z1 SUPN ICA
OPEN POLE OP **
** D60, L60, and L90 only. Other UR-series models apply regular current seal-in for zone 1.
5
For phase distance zone 2, there is a provision to start the zone timer with other distance zones or loop the pickup
flag to avoid prolonging phase distance zone 2 operation when the fault evolves from one type to another or
NOTE
migrates from the initial zone to zone 2. Desired zones in the trip output function should be assigned to accomplish
this functionality.
5-152
SETTING
PH DIST Z1 DELAY
T
PKP
0
T
PKP
0
T
PKP
0
AND
AND
AND
Figure 5–67: PHASE DISTANCE ZONE 1 OP SCHEME
Figure 5–68: PHASE DISTANCE ZONE 2 OP SCHEME
T60 Transformer Protection System
AND
OR
FLEXLOGIC OPERANDS
AND
PH DIST Z1 OP
OR
OR
AND
OR
FLEXLOGIC OPERANDS
PH DIST Z1 OP AB
PH DIST Z1 OP BC
PH DIST Z1 OP CA
5 SETTINGS
837017A8.CDR
GE Multilin
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