GE Multilin L60, Инструкция по эксплуатации

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5-156 L60 Line Phase Comparison System GE Multilin
5.5 GROUPED ELEMENTS 5 SETTINGS
5
h) POSITIVE-SEQUENCE OVERCURRENT FAULT DETECTION
PATH: SETTINGS

GROUPED ELEMENTS

PHASE COMPARISON ELEMENTS

ADVANCED FAULT DETECTORS

POSITIVE-SEQUENCE CURRENT
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 5–58: POSITIVE-SEQUENCE OVERCURRENT ADVANCED FAULT DETECTOR LOGIC

POSITIVE-SEQUENCE

CURRENT
POS SEQ I_1 FD
FUNCTION: Disabled
Range: Disabled, Enabled
MESSAGE
POS SEQ I_1 FDL
PICKUP: 0.10 pu
Range: 0.20 to 5.00 pu in steps of 0.01
MESSAGE
POS SEQ I_1 FDH
PICKUP: 0.50 pu
Range: 0.50 to 15.00 pu in steps of 0.01
MESSAGE
POS SEQ I_1 BLK:
Off
Range: FlexLogic operand
MESSAGE
POS SEQ I_1 FD
TARGET: Self-reset
Range: Self-Reset, Latched, Disabled
MESSAGE
POS SEQ I_1 FD
EVENTS: Disabled
Range: Disabled, Enabled
Hardwired to the
87PC function
To square pulse
and transmit logic
SETTINGS
Enabled = 1
POS SEQ I_1 FD FUNCTION
Off = 0
POS SEQ I_1 BLOCK
AND
FAST MEASUREMENTS
Positive-sequence
current I_1
F1 PHASE CT BANK
L1 PHASE CT BANK
Positive
current I_1
-sequence
Σ
SETTINGS
POS SEQ I_1 FDH PICKUP
RUN
POS SEQ I_1 FDL PICKUP
> (FDL PICKUP) / 4
> (FDH PICKUP) / 4
> (FDL PICKUP) / 4
> (FDH PICKUP) / 4
> FDL PICKUP
> FDH PICKUP
OR
OR
AND
AND
FLEXLOGIC OPERANDS
87PC I_1 FDL OP
87PC I_1 FDH OP
831031A3.CDR