CHAPTER 5: SETTINGS
GROUPED ELEMENTS
L60 LINE PHASE COMPARISON SYSTEM – INSTRUCTION MANUAL
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5
The negative-sequence overcurrent advanced fault detector element responds to the increment of the magnitude of the
negative-sequence current over a specified threshold. Thresholds are provided for low-set control of keying and high-set
operation control of tripping.
NEG SEQ I_2 FD FUNCTION
— This setting enables or disables the negative-sequence overcurrent fault detection. Note that
all fault detectors operate in parallel with the 87PC function. To effectively disable the overcurrent fault detectors under
the 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 key
operation. 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 trip
operation. 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 function
setting or blocked temporarily with this setting. This setting selects a FlexLogic operand that blocks this fault detector
when asserted.
NEG SEQ I_2 FD TARGET
— This setting controls targets of the negative-sequence overcurrent advanced fault detector
function. 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 fault
detector function. These events are logged independently from the 87PC events.
Figure 5-103: Negative-sequence overcurrent advanced fault detector logic
5.6.3.8 Positive-sequence overcurrent fault detection
SETTINGS
GROUPED ELEMENTS
SETTING GROUP 1(6)
PHASE COMPARISON ELEMENTS
ADVANCED FAULT
DETECTORS
POSITIVE-SEQUENCE CURRENT
POSITIVE-SEQUENCE
CURRENT
POS SEQ I_1 FD
FUNCTION: Disabled
Range: Disabled, Enabled
POS SEQ I_1 FDL
PICKUP: 0.10 pu
Range: 0.20 to 5.00 pu in steps of 0.01
POS SEQ I_1 FDH
PICKUP: 0.50 pu
Range: 0.50 to 15.00 pu in steps of 0.01
POS SEQ I_1 BLK:
Off
Range: FlexLogic operand
POS SEQ I_1 FD
TARGET: Self-reset
Range: Self-Reset, Latched, Disabled
POS SEQ I_1 FD
EVENTS: Disabled
Range: Disabled, Enabled