GE L60 Instruction Manual page 187

5 SETTINGS
directional function built into the phase distance element. The directional function uses the memory voltage for polar-
ization. This setting typically equals the distance characteristic angle
• PHS DIST Z1 DIR COMP LIMIT: Selects the comparator limit angle for the directional supervising function.
• PHS DIST Z1 QUAD RGT BLD: This setting defines the right blinder position of the quadrilateral characteristic along
the resistive axis of the impedance plane (see the Quadrilateral Distance Characteristic figures). The angular position
of the blinder is adjustable with the use of the
quadrilateral characteristic and should be set giving consideration to the maximum load current and required resistive
coverage.
• PHS DIST Z1 QUAD RGT BLD RCA: This setting defines the angular position of the right blinder of the quadrilateral
characteristic (see the Quadrilateral Distance Characteristic figures).
• PHS DIST Z1 QUAD LFT BLD: This setting defines the left blinder position of the quadrilateral characteristic along the
resistive axis of the impedance plane (see the Quadrilateral Distance Characteristic figure). The angular position of the
blinder is adjustable with the use of the
lateral characteristic and should be set with consideration to the maximum load current.
• PHS DIST Z1 QUAD LFT BLD RCA: This setting defines the angular position of the left blinder of the quadrilateral
characteristic (see the Quadrilateral Distance Characteristic figures).
• PHS DIST Z1 SUPV: The phase distance elements are supervised by the magnitude of the line-to-line current (fault
loop current used for the distance calculations). For convenience,
being used, the entered value of the threshold setting is multiplied by
If the minimum fault current level is sufficient, the current supervision pickup should be set above maximum full load
current preventing maloperation under VT fuse fail conditions. This requirement may be difficult to meet for remote
faults at the end of Zones 2 through 3. If this is the case, the current supervision pickup would be set below the full load
current, but this may result in maloperation during fuse fail conditions.
• PHS DIST Z1 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 where the zone shall not overreach. For plain
(non-compensated) lines, set to zero. Otherwise, the setting is entered in per unit of the phase VT bank configured
under the
DISTANCE SOURCE
tional applications (
PHS DIST Z1 DIR
directional zone. See Chapters 8 and 9 for information on calculating this setting for series compensated lines.
• PHS DIST Z1 DELAY: This setting allows the user to delay operation of the distance elements and implement stepped
distance protection. The distance element timers for Zones 2 through 3 apply 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. 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.
GE Multilin
PHS DIST Z1 QUAD RGT BLD RCA
PHS DIST Z1 QUAD LFT BLD RCA
. Effectively, this setting facilitates dynamic current-based reach reduction. In non-direc-
set to "Non-directional"), this setting applies only to the forward reach of the non-
L60 Line Phase Comparison Relay
5.5 GROUPED ELEMENTS
.
PHS DIST Z1 RCA
setting. This setting applies only to the
setting. This setting applies only to the quadri-
3 is accommodated by the pickup (i.e., before
3 ).
5
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