GE L60 Instruction Manual page 281

5 SETTINGS
h) POSITIVE-SEQUENCE OVERCURRENT FAULT DETECTION
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PATH: SETTINGS GROUPED ELEMENTS
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POSITIVE-SEQUENCE CURRENT
 POSITIVE-SEQUENCE
 CURRENT
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
The positive-sequence overcurrent advanced fault detector element responds to the increment of the magnitude of the pos-
itive-sequence current over a specified threshold. Thresholds are provided for low-set control of keying and high-set opera-
tion control of tripping.
The following settings are available.
• POS SEQ I_1 FD FUNCTION: This setting enables or disables the positive-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.
• POS SEQ I_1 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.
• POS SEQ I_1 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.
• POS SEQ I_1 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.
• POS SEQ I_1 FD TARGET: This setting controls targets of the positive-sequence overcurrent advanced fault detector
function. These targets operate independently from the 87PC targets.
• POS SEQ I_1 FD EVENTS: This setting controls event recording of the positive-sequence overcurrent advanced fault
detector function. These events are logged independently from the 87PC events.
Figure 5–57: POSITIVE-SEQUENCE OVERCURRENT ADVANCED FAULT DETECTOR LOGIC
GE Multilin
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PHASE COMPARISON ELEMENTS
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
L60 Line Phase Comparison System
5.5 GROUPED ELEMENTS
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ADVANCED FAULT DETECTORS
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
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