GE L60 Instruction Manual page 377

5 SETTINGS
• TRIP 1-POLE INPUT-1 to TRIP 1-POLE INPUT-6: These settings are used to select an operand representing a fault
condition that is desired to initiate a single pole trip-and-reclose if the fault is single phase to ground (for example, dis-
tance zone 1). Use a FlexLogic OR-gate if more than six inputs are required. The inputs do not have to be phase-spe-
cific as the phase selector determines the fault type.
The operand is asserted by the autorecloser 1.5 cycles after single-pole reclosing is initiated. This
AR FORCE 3-P TRIP
operand calls for a three-pole trip if any protection element configured under
open pole detector provides blocking inputs to distance elements, and therefore the latter will reset immediately after
the operand is asserted. For other protection elements used in single-pole tripping, the user must ensure
TRIP 1-POLE
they will reset immediately after tripping, otherwise the fact that they are still picked up will be detected as an evolving
fault and the relay will trip three-poles. For example, if high-set phase instantaneous overcurrent is used (
"
PHASE IOC1 OP
INPUT X:
rent element. In this way, after tripping phase A, the phase a instantaneous overcurrent element is forced to reset.
Phases B and C are still operational and can detect an evolving fault as soon as 8 ms after tripping phase A. Neutral
and negative-sequence instantaneous overcurrent elements shall be blocked from the
unless the pickup setting is high enough to prevent pickup during single-pole reclosing.
• TRIP RECLOSE INPUT-1 to TRIP RECLOSE INPUT-6: These settings select an operand representing a fault condi-
tion that is desired to initiate three pole reclosing (for example, phase distance zone 1). Use a FlexLogic OR-gate if
more than six inputs are required. These inputs also include the
which are intended to initiate three-pole reclosing in situations where single-pole tripping commands are changed to
three-pole tripping commands. This can happen in cases where the phase selector identifies a multi-phase fault or the
command is present.
AR FORCE 3P TRIP
• TRIP SEAL-IN DELAY: This setting specifies the minimum time that trip command signals are maintained to provide
sufficient time to open the breaker poles. If a value of "0" is specified, then the output signal is reset once the protection
elements initiating the trip are reset. If a value other than "0" is specified, then the protection elements must reset and
the timer initiated at the first trip command must expire.
• TRIP RESET: This setting selects the option to reset the trip latches. If "Pole Curr OR Custom" is chosen, then the
OPEN POLE CURRENT PKP
ers should be set appropriately. Both the "Current" and "CBaux" options can be complimented by custom conditions
using the ,
BKR ΦA OPEN
tion can be applied to reset trip output latches.
• START TMR Z2PH Inp1 and START TMR Z2PH Inp2: These settings select an operand that will start the phase dis-
tance zone 2 timer to avoid a trip delay if the fault evolves from one type to another type (for example, from a single-
line–to-ground fault to a multi-phase fault) or from one zone of protection to another zone of protection (for example,
from zone 3 to zone 2). For instance, the
and could be assigned to either of these settings. Use a FlexLogic OR-gate if more than two inputs are required. Refer
to phase distance logic diagrams for additional information.
• START TMR Z2GR Inp1 and START TMR Z2GR Inp2: These settings select an operand that will start the ground dis-
tance zone 2 timer to avoid a trip delay if the fault evolves from one zone of protection to another zone of protection (for
example, from zone 3 to zone 2). For instance, the
settings. Use a FlexLogic OR-gate if more than two inputs are required. Refer to ground distance logic diagrams for
additional information.
• TRIP FORCE 3-POLE: Selects an operand that will force an input selected for single pole operation to produce a three
pole operation. The
AR DISABLED
urations or conditions which require such operations may be considered as well.
• TRIP PILOT PRIORITY: This setting is used to set an interval equal to the inter-relay channel communications time,
plus an appropriate margin, during which outputs are not asserted. This delay permits fault identification information
from a remote terminal to be used instead of local data only.
• REVERSE FAULT: This setting should be used to guarantee accuracy of single-pole tripping under evolving external to
internal faults. When a close-in external fault occurs, the relay is biased toward very fast operation on a following inter-
nal fault. This is primarily due to depressed voltages and elevated currents in response to the first, external fault. The
phase selector can exhibit some time lag compared to the main protection elements. This can potentially result in a
spurious three-pole operation on a single-line-to-ground internal fault. Delaying tripping on internal faults that follow
detection of reverse faults solves the problem.
GE Multilin
"), then shall be used for blocking phase A of the instantaneous overcur-
OPEN POLE OP ΦA
setting should be programmed accordingly. If "CBaux OR Custom" is chosen, then the break-
, and
BKR ΦB OPEN BKR ΦC OPEN
GND DIST Z2 PKP
GND DIST Z3 PKP
FlexLogic operand is the recommended value for this setting. Power system config-
L60 Line Phase Comparison System
TRIP 1-POLE INPUT
TRIP 1-POLE INPUT-1
settings indicated below. Alternately, a purely custom condi-
FlexLogic operand or the
PH DIST Z3 PKP
FlexLogic operand could be assigned to these
5.6 CONTROL ELEMENTS
remains picked-up. The
TRIP 1-POLE
operand
OPEN POLE BLK N
to values,
TRIP 1-POLE INPUT-6
FlexLogic oper-
5-245
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