GE L90 Instruction Manual page 354

5.7 CONTROL ELEMENTS
• TRIP MODE: This setting is used to select the required mode of operation. If selected to "3 Pole Only" outputs for all
three phases are always set simultaneously. If selected to "3 Pole & 1 Pole" outputs for all three phases are set simul-
taneously unless the phase selector or a pilot aided scheme determines the fault is single-phase-to-ground. If the fault
is identified as being AG, BG or CG only the operands for the faulted phase will be asserted.
• TRIP 3-POLE INPUT-1 to TRIP 3-POLE INPUT-6: These settings are used to select an operand representing a fault
condition that is not desired to initiate a single pole operation (for example, phase undervoltage). Use a FlexLogic OR-
gate if more than six inputs are required.
• 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-
specific as the phase selector determines the fault type.
The
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
5
more than six inputs are required. These inputs will 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 may happen in cases where the phase selector identifies a multi-phase fault or the
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
BKR ΦA OPEN
using the
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
operand 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.
BKR ΦA OPEN, BKR ΦB OPEN, and BKR ΦC OPEN: This settings are used to select an operand to indicates that
•
phase A, B, or C of the breaker is open, respectively.
• TRIP FORCE 3-POLE: Selects an operand that will force an input selected for single pole operation to produce a three
pole operation. The
figurations or conditions which require such operations may be considered as well.
5-218
operand is asserted by the autorecloser 1.5 cycles after single-pole reclosing is initiated. This
OPEN POLE OP ΦA
"), then
command is present.
setting should be programmed accordingly. If "CBaux OR Custom" is chosen, then the break-
BKR ΦB OPEN BKR ΦC OPEN
, , and
GND DIST Z2 PKP
FlexLogic™ operand is the recommended value for this setting. Power system con-
AR DISABLED
L90 Line Current Differential System
TRIP 1-POLE INPUT
shall be used for blocking phase A of the instantaneous overcur-
TRIP 1-POLE INPUT-1
settings indicated below. Alternately, a purely custom condi-
FlexLogic™ operand or the
FlexLogic™ operand could be assigned to these
GND DIST Z3 PKP
5 SETTINGS
remains picked-up. The
TRIP 1-POLE
operand
OPEN POLE BLK N
to values,
TRIP 1-POLE INPUT-6
FlexLogic™
PH DIST Z3 PKP
GE Multilin