GE Multilin
F60 Feeder Protection System
5-199
5 SETTINGS
5.6 CONTROL ELEMENTS
5
The number of detected incipient faults in each phase is counted and available in the
ACTUAL VALUES
Ö
STATUS
ÖØ
INCIPI-
ENT FAULT
menus. The counters can be reset with the
COMMANDS
ÖØ
CLEAR RECORDS
ÖØ
CLEAR INCIPENT FAULT COUN-
TERS
command.
Changes to any of the incipient cable fault detector settings resets of the number of the incipient faults detected to
zero.
To provide a clear timing indication when the incipient fault occurred, the incipient fault event is time-stamped with
the time the fault actually occurred. However, the FlexLogic™ operand is asserted four cycles later, when the incip-
ient fault pattern is confirmed and therefore detected.
The following figure illustrates a recorded field case of an incipient phase B fault. The top portion of the figure shows the
raw A, B and C currents. The bottom portion shows the neutral current (blue) and reveals the fault period from under the
load and the superimposed phase B current (red). The superimposed current shows two fault current blips as the data
slides through the two-cycle memory window. During the actual fault, the neutral current and the superimposed phase B
currents closely correspond, confirming the incipient fault hypothesis and identifying the affected phase.
Figure 5–104: ILLUSTRATION OF THE INCIPIENT FAULT DETECTOR ALGORITHM
The following settings are available for each incipient cable fault detector.
•
INCIPIENT FAULT 1 FUNCTION
: This setting enable and disables operation of the incipient fault detection element.
•
INCIPNT FLT 1 BLOCK
: This setting is used to block operation of the incipient cable fault detector element. Assertion
of the FlexLogic™ operand assigned to this setting block operation.
•
INCIPIENT FAULT 1 SOURCE
: This setting selects a current source for the incipient cable fault detector element. This
source must be assigned a valid CT bank.
•
INCIPIENT FAULT 1 PICKUP
: This setting specifies pickup level of the overcurrent detector in per-unit values of the
CT nominal current.
•
INCIPNT FLT 1 MODE
: There are two modes of operation available for the incipient cable fault detector element. In
the “Number of counts” mode, a trip will be initiated only after the selected number of faults is detected. In the “Counts
per window” mode, a trip will be initiated only after the selected number of faults is detected within the time specified by
the
INCIPNT FLT 1 DETECT WINDOW
setting.
•
INCIPIENT FLT 1 TRIP COUNTS NUMBER
: This setting selects the number of faults required to initiate a trip.
•
INCIPNT FLT 1 DETECT WINDOW
: This setting specifies a time window for “Counts per window” mode of operation.
NOTE
NOTE
0.62
0.64
0.66
0.68
0.70
0.72
0.74
0
1.0
2.0
0.62
0.64
0.66
0.68
0.7
0.72
0.74
–2.0
–1.0
0
1.0
2.0
I
N
(neutral current)
I
FB
–0.5
Phase B
Phase C
Phase A
Incipient phase B fault
Curr
ent
(amps)
Curr
ent
(amps)
832774A1.CDR
PHASE CURRENTS
CALCULATED NEUTRAL AND
SUPERIMPOSED PHASE B CURRENT
Summary of Contents for F60 UR Series
Page 2: ......
Page 4: ......
Page 30: ...1 20 F60 Feeder Protection System GE Multilin 1 5 USING THE RELAY 1 GETTING STARTED 1 ...
Page 48: ...2 18 F60 Feeder Protection System GE Multilin 2 2 SPECIFICATIONS 2 PRODUCT DESCRIPTION 2 ...
Page 126: ...4 30 F60 Feeder Protection System GE Multilin 4 2 FACEPLATE INTERFACE 4 HUMAN INTERFACES 4 ...
Page 354: ...5 228 F60 Feeder Protection System GE Multilin 5 9 TESTING 5 SETTINGS 5 ...
Page 382: ...6 28 F60 Feeder Protection System GE Multilin 6 5 PRODUCT INFORMATION 6 ACTUAL VALUES 6 ...
Page 398: ...8 8 F60 Feeder Protection System GE Multilin 8 2 FAULT LOCATOR 8 THEORY OF OPERATION 8 ...
Page 414: ...A 14 F60 Feeder Protection System GE Multilin A 1 PARAMETER LIST APPENDIXA A ...
Page 492: ...B 78 F60 Feeder Protection System GE Multilin B 4 MEMORY MAPPING APPENDIXB B ...
Page 530: ...D 10 F60 Feeder Protection System GE Multilin D 1 IEC 60870 5 104 APPENDIXD D ...
Page 542: ...E 12 F60 Feeder Protection System GE Multilin E 2 DNP POINT LISTS APPENDIXE E ...
Page 558: ...x F60 Feeder Protection System GE Multilin INDEX ...