GE L90 Instruction Manual page 373

5 SETTINGS
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The trip output element is primarily used to collect trip requests from protection elements and other inputs to generate out-
put operands 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
as inputs to a FlexLogic™
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.
The trip output element works in association with other L90 elements (refer to the Theory of operation chapter for a com-
plete description of single-pole operations) that must be programmed and in-service for successful operation. The neces-
sary 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 sig-
nals to the breaker failure elements.
The trip output element is used to aggregate inputs from appropriate protection elements (including 87L line differential, dis-
tance, and instantaneous overcurrent functions) to provide single-pole tripping. The line current differential function is hard-
wired through the 87L TRIP function, which has to be enabled and configured properly.
The 87L TRIP function collects inputs from both the 87L line differential and 87L DTT functions. It can be supervised by the
disturbance detector and determines if the fault type is single-line-to-ground or multi-phase. The 87L TRIP function sends a
direct command to the trip output element to execute appropriate tripping action without any consultation with phase selec-
tor.
Other protective functions, such as distance and overcurrent, need to be assigned to appropriate trip output single-pole or
three-pole inputs and will require phase selector fault identification for tripping action. A timer defined by the
setting can be used to delay the output decision from other local protection elements to give 87L operational priority.
ORITY
This prevents three-pole operation where a single pole operation is permitted.
To ensure correct operation of the single-pole tripping feature, any non-distance protection used for single pole trip-
ping (such as high-set overcurrent using the instantaneous or directional overcurrent elements) must be blocked by
the
NOTE OPEN POLE OP ΦA
rent phase A will be blocked by
tection.
The following settings are available for the trip output element.
GE Multilin
TRIP FORCE 3-POLE:
Off
TRIP PILOT PRIORITY:
0.000 s
REVERSE FAULT:
Off
TRIP DELAY ON EVOLV
FAULTS: 0.000 s
TRIP EVENTS:
Disabled
TRIP 3-POLE
gate to operate the faceplate Trip indicator LED.
, , or
OPEN POLE OP ΦB OPEN POLE OP ΦC
OPEN POLE OP ΦA
L90 Line Current Differential System
Range: FlexLogic™ operand
Range: 0 to 65.535 s in steps of 0.001
Range: FlexLogic™ operand
Range: 0 to 65.535 s in steps of 0.001
Range: Enabled, Disabled
and output operands can also be used
TRIP 1-POLE
operands. For example, instantaneous overcur-
operand. This blocking condition is pre-wired for distance pro-
5.7 CONTROL ELEMENTS
TRIP PILOT PRI-
5-243
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