5-134 L90 Line Current Differential System GE Multilin5.6 GROUPED ELEMENTS 5 SETTINGS55.6.4 LINE PICKUPPATH: SETTINGS ÖØ GROUPED ELEMENTS Ö SETTING GROUP 1(6) ÖØ LINE PICKUPThe line pickup feature uses a combination of undercurrent and undervoltage to identify a line that has been de-energized(line end open). Alternately, the user may assign a FlexLogic™ operand to the TERMINAL OPEN setting that specifies the ter-minal status. Three instantaneous overcurrent elements are used to identify a previously de-energized line that has beenclosed onto a fault. Faults other than close-in faults can be identified satisfactorily with the distance elements.Co-ordination features are included to ensure satisfactory operation when high speed automatic reclosure (AR) isemployed. The AR CO-ORD DELAY setting allows the overcurrent setting to be below the expected load current seen afterreclose. Co-ordination is achieved by all of the LINE PICKP UV elements resetting and blocking the trip path before the ARCO-ORD DELAY times out. The AR CO-ORD BYPASS setting is normally enabled. It is disabled if high speed autoreclosure isimplemented.The line pickup protection incorporates zone 1 extension capability. When the line is being re-energized from the local ter-minal, pickup of an overreaching zone 2 or excessive phase current within eight power cycles after the autorecloser issuesa close command results in the LINE PICKUP RCL TRIP FlexLogic™ operand. For security, the overcurrent trip is supervised LINE PICKUPLINE PICKUPFUNCTION: DisabledRange: Disabled, EnabledMESSAGE LINE PICKUP SIGNALSOURCE: SRC 1Range: SRC 1, SRC 2, SRC 3, SRC 4MESSAGE PHASE IOC LINEPICKUP: 1.000 puRange: 0.000 to 30.000 pu in steps of 0.001MESSAGE LINE PICKUP UV PKP:0.700 puRange: 0.000 to 3.000 pu in steps of 0.001MESSAGE LINE END OPEN PICKUPDELAY: 0.150 sRange: 0.000 to 65.535 s in steps of 0.001MESSAGE LINE END OPEN RESETDELAY: 0.090 sRange: 0.000 to 65.535 s in steps of 0.001MESSAGE LINE PICKUP OV PKPDELAY: 0.040 sRange: 0.000 to 65.535 s in steps of 0.001MESSAGE AR CO-ORD BYPASS:EnabledRange: Disabled, EnabledMESSAGE AR CO-ORD PICKUPDELAY: 0.045 sRange: 0.000 to 65.535 s in steps of 0.001MESSAGE AR CO-ORD RESETDELAY: 0.005 sRange: 0.000 to 65.535 s in steps of 0.001MESSAGE TERMINAL OPEN:OffRange: FlexLogic™ operandMESSAGE AR ACCELERATE:OffRange: FlexLogic™ operandMESSAGE LINE PICKUP DISTANCETRIP: EnabledRange: Disabled, EnabledMESSAGE LINE PICKUP BLOCK:OffRange: FlexLogic™ operandMESSAGE LINE PICKUPTARGET: Self-resetRange: Self-reset, Latched, DisabledMESSAGE LINE PICKUPEVENTS: DisabledRange: Disabled, Enabled
