GE L60 Instruction Manual page 289

5 SETTINGS
This element is primarily used to collect trip requests from protection elements and other inputs to generate output oper-
ands to initiate trip operations. Three pole trips will only initiate reclosure if programmed to do so, whereas single pole trips
will always automatically initiate reclosure. The
to a FlexLogic™ gate to operate the faceplate Trip indicator LED.
OR
THREE POLE OPERATION:
In applications where single pole tripping is not required this element provides a convenient method of collecting inputs to
initiate tripping of circuit breakers, the reclose element and breaker failure elements.
SINGLE POLE OPERATION:
This element must be used in single pole operation applications.
NOTE
In these applications this element is used to:
• determine if a single pole operation should be performed
• collect inputs to initiate three pole tripping, the recloser and breaker failure elements
• collect inputs to initiate single pole tripping, the recloser and breaker failure elements
• assign a higher priority to pilot aided scheme outputs than to exclusively local inputs.
This element works in association with other L60 elements (see Chapter 8 for a complete description of single pole opera-
tions) that must be programmed and in-service for successful operation. The necessary elements are: Recloser, Breaker
Control, Open Pole Detector, and Phase Selector. The recloser must also be in the "Reset" state before a single pole trip
can be issued. Outputs from this element are also directly connected as initiate signals to the breaker failure elements.
At least one internal protection element or digital input representing detection of a fault must be available as an input to this
element. In pilot-aided scheme applications (DUTT, PUTT, POTT, Hybrid POTT, and Directional Blocking) a timer can be
used to delay the output decision until data from a remote terminal is received from communications facilities, to prevent a
three pole operation where a single pole operation is permitted.
• 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(6): This setting is used to select an operand representing a fault condition that is not desired to
initiate a single pole operation, e.g. phase undervoltage. Use a FlexLogic
• TRIP 1-POLE INPUT-1(6): Selects 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, e.g. distance Zone 1. Use a FlexLogic™
inputs are required. The inputs do not have to be phase-specific 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 (
"
INPUT X: PHASE IOC1 OP
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(6): Selects an operand representing a fault condition that is desired to initiate three pole
reclosing, e.g. Phase Distance Zone 1. Use a FlexLogic™
• 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
figurations or conditions which require such operations may be considered as well.
GE Multilin
TRIP 3-POLE
"), then shall be used for blocking Phase A of the Instantaneous Overcur-
OPEN POLE OP ΦA
FlexLogic™ operand is the recommended value for this setting. Power system con-
L60 Line Phase Comparison Relay
and output operands can also be used as inputs
TRIP 1-POLE
-gate if more than six inputs are required.
OR
TRIP 1-POLE INPUT
-gate if more than six inputs are required.
OR
5.6 CONTROL ELEMENTS
-gate if more than six
OR
remains picked-up. The
TRIP 1-POLE
operand
OPEN POLE BLK N
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