CHAPTER 5: SETTINGS GROUPED ELEMENTSL60 LINE PHASE COMPARISON SYSTEM – INSTRUCTION MANUAL 5-2055The negative-sequence overcurrent advanced fault detector element responds to the increment of the magnitude of thenegative-sequence current over a specified threshold. Thresholds are provided for low-set control of keying and high-setoperation control of tripping.NEG SEQ I_2 FD FUNCTION — This setting enables or disables the negative-sequence overcurrent fault detection. Note thatall fault detectors operate in parallel with the 87PC function. To effectively disable the overcurrent fault detectors underthe main 87PC menu, set their threshold very high.NEG SEQ I_2 FDL PICKUP — This setting specifies the pickup of the low-set stage of the element used to control the keyoperation. The nominal current of the phase CT bank of the relay is 1 pu.NEG SEQ I_2 FDH PICKUP — This setting specifies the pickup of the high-set stage of the element used to control the tripoperation. The nominal current of the phase CT bank of the relay is 1 pu.NEG SEQ I_2 BLK — The fault detector is hard-wired to the 87PC scheme. It can be disabled permanently using the functionsetting or blocked temporarily with this setting. This setting selects a FlexLogic operand that blocks this fault detectorwhen asserted.NEG SEQ I_2 FD TARGET — This setting controls targets of the negative-sequence overcurrent advanced fault detectorfunction. These targets operate independently from the 87PC targets.NEG SEQ I_2 FD EVENTS — This setting controls event recording of the negative-sequence overcurrent advanced faultdetector function. These events are logged independently from the 87PC events.Figure 5-103: Negative-sequence overcurrent advanced fault detector logic5.6.3.8 Positive-sequence overcurrent fault detectionSETTINGS GROUPED ELEMENTS SETTING GROUP 1(6) PHASE COMPARISON ELEMENTS ADVANCED FAULTDETECTORS POSITIVE-SEQUENCE CURRENT POSITIVE-SEQUENCE CURRENT POS SEQ I_1 FDFUNCTION: DisabledRange: Disabled, Enabled POS SEQ I_1 FDLPICKUP: 0.10 puRange: 0.20 to 5.00 pu in steps of 0.01 POS SEQ I_1 FDHPICKUP: 0.50 puRange: 0.50 to 15.00 pu in steps of 0.01 POS SEQ I_1 BLK:OffRange: FlexLogic operand POS SEQ I_1 FDTARGET: Self-resetRange: Self-Reset, Latched, Disabled POS SEQ I_1 FDEVENTS: DisabledRange: Disabled, Enabled
