GE L60 Instructions Manual page 413

CHAPTER 5: SETTINGS
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.
— This setting enables or disables the negative-sequence overcurrent fault detection. Note that
NEG SEQ I_2 FD FUNCTION
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.
— This setting specifies the pickup of the low-set stage of the element used to control the key
NEG SEQ I_2 FDL PICKUP
operation. The nominal current of the phase CT bank of the relay is 1 pu.
— This setting specifies the pickup of the high-set stage of the element used to control the trip
NEG SEQ I_2 FDH PICKUP
operation. The nominal current of the phase CT bank of the relay is 1 pu.
— The fault detector is hard-wired to the 87PC scheme. It can be disabled permanently using the function
NEG SEQ I_2 BLK
setting or blocked temporarily with this setting. This setting selects a FlexLogic operand that blocks this fault detector
when asserted.
— This setting controls targets of the negative-sequence overcurrent advanced fault detector
NEG SEQ I_2 FD TARGET
function. These targets operate independently from the 87PC targets.
— This setting controls event recording of the negative-sequence overcurrent advanced fault
NEG SEQ I_2 FD EVENTS
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
L60 LINE PHASE COMPARISON SYSTEM – INSTRUCTION MANUAL
POS SEQ I_1 FD

FUNCTION: Disabled
POS SEQ I_1 FDL

PICKUP: 0.10 pu
POS SEQ I_1 FDH

PICKUP: 0.50 pu
POS SEQ I_1 BLK:

Off
POS SEQ I_1 FD

TARGET: Self-reset
POS SEQ I_1 FD

EVENTS: Disabled
GROUPED ELEMENTS
Range: Disabled, Enabled
Range: 0.20 to 5.00 pu in steps of 0.01
Range: 0.50 to 15.00 pu in steps of 0.01
Range: FlexLogic operand
Range: Self-Reset, Latched, Disabled
Range: Disabled, Enabled
5
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