GE UR series Instruction Manual page 247

5 SETTINGS
c) ADVANCED FAULT DETECTORS MAIN MENU
PATH: SETTINGS GROUPED ELEMENTS
ADVANCED
FAULT DETECTORS
MESSAGE
MESSAGE
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Five advanced fault detectors are provided.
The negative-sequence voltage element responds to the I × Z – V term for negative-sequence voltage and current and is
meant to detect faults under weak system conditions.
The negative-sequence current rate of change element responds to the increment in the magnitude of the negative-
sequence current over a half-a-cycle moving data window, and is meant to detect faults under load unbalance such as on
untransposed high voltage transmission lines or in a vicinity of electrical traction systems causing significant negative-
sequence current unbalance.
The positive-sequence current rate of change element responds to the increment in the magnitude of the positive-
sequence current over a half-a-cycle moving data window, and is meant to detect three-phase balance faults under high
load conditions.
The negative-sequence current overcurrent element responds to the increment of the negative-sequence current above
threshold.
The positive-sequence current overcurrent element responds to the increment of the positive-sequence current above
threshold.
All advanced fault detectors operate independently from each other, and independently from the mixed signal overcurrent
FDL and FDH comparators embedded in the 87PC function. Each detector supports the low and high setting levels to facil-
itate starting and supervise tripping. When enabled, a given detector is automatically used to control the 87PC function.
Effectively all detectors are ORed before they are routed to the 87PC element.
The overcurrent fault detectors respond to the effective operating current of the 87PC function, which includes charging
current compensation. The advanced fault detectors respond to their operating signals irrespective of the configured 87PC
current.
d) NEGATIVE-SEQUENCE VOLTAGE FAULT DETECTION
PATH: SETTINGS GROUPED...
NEGATIVE SEQUENCE
VOLTAGE
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MESSAGE
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GE Multilin
PHASE COMPARISON ELEMENTS
NEGATIVE-SEQUENCE
VOLTAGE
RATE OF CHANGE OF
NEG SEQ CURRENT
RATE OF CHANGE OF
POS SEQ CURRENT
NEGATIVE SEQUENCE
CURRENT
POSITIVE SEQUENCE
CURRENT
PHASE COMPARISON... ADVANCED FAULT DETECTORS
NEG SEQ VOL FD
FUNCTION: Disabled
NEG SEQ VOL FD
IMPEDANCE: 10.0%
NEG SEQ VOL FDL
PICKUP: 0.010 pu
NEG SEQ VOL FDH
PICKUP: 0.050 pu
NEG SEQ VOL FD BLK:
Off
L60 Line Phase Comparison System
5.5 GROUPED ELEMENTS
ADVANCED FAULT DETECTORS
See page 5–115.
See page 5–117.
See page 5–118.
See page 5–119.
See page 5–120.
NEGATIVE SEQUENCE VOLTAGE
Range: Disabled, Enabled
Range: 0.0 to 100% in steps of 0.1
Range: 0.005 to 3.000 pu in steps of 0.001
Range: 0.005 to 3.000 pu in steps of 0.001
Range: any FlexLogic™ operand
5
5-115