5-200
L60 LINE PHASE COMPARISON SYSTEM – INSTRUCTION MANUAL
GROUPED ELEMENTS
CHAPTER 5: SETTINGS
5
5.6.3.3 Advanced fault detectors
Menu
SETTINGS
GROUPED ELEMENTS
SETTING GROUP 1(6)
PHASE COMPARISON ELEMENTS
ADVANCED FAULT
DETECTORS
Five advanced fault detectors are provided, which are supervised by the condition that the magnitude of mixed current
has to be above 0.02 pu.
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 vector difference 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 vector difference of the positive-sequence current
over a half-a-cycle moving data window, and it 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
facilitate 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.
5.6.3.4 Negative-sequence voltage fault detection
SETTINGS
GROUPED ELEMENTS
SETTING GROUP 1(6)
PHASE COMPARISON ELEMENTS
ADVANCED FAULT
DETECTORS
NEGATIVE SEQUENCE VOLTAGE
ADVANCED
FAULT DETECTORS
NEGATIVE SEQUENCE
VOLTAGE
See below
RATE OF CHANGE OF
NEG SEQ CURRENT
RATE OF CHANGE OF
POS SEQ CURRENT
NEGATIVE SEQUENCE
CURRENT
POSITIVE SEQUENCE
CURRENT
NEGATIVE SEQUENCE
VOLTAGE
NEG SEQ VOL FD
FUNCTION: Disabled
Range: Disabled, Enabled
NEG SEQ VOL FD
IMPEDANCE: 10.0%
Range: 0.0 to 100% in steps of 0.1
NEG SEQ VOL FDL
PICKUP: 0.010 pu
Range: 0.005 to 3.000 pu in steps of 0.001
NEG SEQ VOL FDH
PICKUP: 0.050 pu
Range: 0.005 to 3.000 pu in steps of 0.001