GE UR Series Instruction Manual page 149

5 SETTINGS
PHS DIST Z2 VOLT LEVEL:
This setting is relevant for applications on series-compensated lines, or in general, if series capacitors are located between
the relaying point and a point for which the zone shall not overreach. For plain (non-compensated) lines, this setting shall
be set to zero. Otherwise, the setting is entered in per unit of the phase VT bank configured under the
See the THEORY OF OPERATION chapter for more details, and the APPLICATION OF SETTINGS chapter for information
on how to calculate this setting for applications on series compensated lines.
PHS DIST Z2 DELAY:
This setting enables the user to delay operation of the distance elements and implement a stepped distance protection.
The distance element timer applies a short dropout delay to cope with faults located close to the zone boundary when small
oscillations in the voltages and/or currents could inadvertently reset the timer.
PHS DIST Z2 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 OPERANDS
PH DIST Z2 PKP AB
PH DIST Z2 PKP BC
PH DIST Z2 PKP CA
GE Power Management
SETTING
PHS DIST Z2
DELAY:
t
PKP
20 msec
t
PKP
20 msec
t
PKP
20 msec
Figure 5–26: PHASE DISTANCE Z2 OP SCHEME
L90 Line Differential Relay
5.5 GROUPED ELEMENTS
FLEXLOGIC OPERANDS
PH DIST Z2 OP AB
PH DIST Z2 OP BC
PH DIST Z2 OP CA
FLEXLOGIC OPERAND
OR PH DIST Z2 OP
837020A4.CDR
.
DISTANCE SOURCE
5
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