5-152 T60 Transformer Protection System GE Multilin
5.6 GROUPED ELEMENTS 5 SETTINGS
5
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.
Figure 5–67: PHASE DISTANCE ZONE 1 OP SCHEME
Figure 5–68: PHASE DISTANCE ZONE 2 OP SCHEME
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
migrates from the initial zone to zone 2. Desired zones in the trip output function should be assigned to accomplish
this functionality.
** D60, L60, and L90 only. Other UR-series models apply regular current seal-in for zone 1.
OR OR
OR
OR
AND
AND
AND
AND
AND
AND
837017A8.CDR
FLEXLOGIC OPERAND
PH DIST Z1 PKP AB
PH DIST Z1 SUPN IAB
PH DIST Z1 SUPN IBC
PH DIST Z1 SUPN ICA
OPEN POLE OP **
FLEXLOGIC OPERANDS
SETTING
PH DIST Z1 DELAY
T
PKP
0
T
PKP
0
T
PKP
0
FLEXLOGIC OPERAND
PH DIST Z1 PKP BC
FLEXLOGIC OPERAND
PH DIST Z1 PKP CA
PH DIST Z1 OP AB
PH DIST Z1 OP BC
PH DIST Z1 OP CA
FLEXLOGIC OPERANDS
PH DIST Z1 OP
FLEXLOGIC OPERANDS
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