GE Multilin L60 Line Phase Comparison System 5-2355 SETTINGS 5.6 CONTROL ELEMENTS5The 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 singlepole trips will always automatically initiate reclosure. The TRIP 3-POLE and TRIP 1-POLE output operands can also be usedas inputs to a FlexLogic OR gate to operate the faceplate Trip indicator LED.THREE POLE OPERATION:In applications where single-pole tripping is not required this element provides a convenient method of collecting inputs toinitiate tripping of circuit breakers, the reclose element and breaker failure elements.SINGLE POLE OPERATION:This element must be used in single pole operation applications.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 L60 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.At least one internal protection element or digital input representing detection of a fault must be available as an input to thiselement. In pilot-aided scheme applications, a timer can be used to delay the output decision until data from a remote ter-minal is received from communications facilities, to prevent a three pole operation where a single pole operation is permit-ted.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 bythe OPEN POLE OP ΦA , OPEN POLE OP ΦB , or OPEN POLE OP ΦC operands. For example, instantaneous overcur-rent phase A will be blocked by OPEN POLE OP ΦA operand. This blocking condition is pre-wired for distance pro-tection.The following settings are available for the trip output element.• TRIP MODE: This setting is used to select the required mode of operation. If selected to “3 Pole Only” outputs for allthree 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 faultis 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 faultcondition 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.MESSAGE TRIP DELAY ON EVOLVFAULTS: 0.000 sRange: 0 to 65.535 s in steps of 0.001MESSAGE BKR ΦA OPEN:OffRange: FlexLogic operandMESSAGE BKR ΦB OPEN:OffRange: FlexLogic operandMESSAGE BKR ΦC OPEN:OffRange: FlexLogic operandMESSAGE TRIP EVENTS:DisabledRange: Enabled, DisabledNOTENOTE
