Records; Fault Reports - GE L90 Instruction Manual

6 ACTUAL VALUES

6.4RECORDS

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PATH: ACTUAL VALUES RECORDS
NO FAULTS TO REPORT
or
# FAULT REPORT 1
#
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
The latest 15 fault reports can be stored. The most recent fault location calculation (when applicable) is displayed in this
menu, along with the date and time stamp of the event which triggered the calculation. See the
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SETUP

FAULT REPORTS

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COMMANDS CLEAR RECORDS
menu for automated clearing of the fault reports.
CLEAR RELAY RECORDS
Fault type determination is required for calculation of fault location – the algorithm uses the angle between the negative and
positive sequence components of the relay currents. To improve accuracy and speed of operation, the fault components of
the currents are used, i.e., the pre-fault phasors are subtracted from the measured current phasors. In addition to the angle
relationships, certain extra checks are performed on magnitudes of the negative and zero-sequence currents.
The single-ended fault location method assumes that the fault components of the currents supplied from the local (A) and
remote (B) systems are in phase. The figure below shows an equivalent system for fault location.
The following equations hold true for this equivalent system.
where: m = sought pu distance to fault, Z = positive sequence impedance of the line.
The currents from the local and remote systems can be parted between their fault (F) and pre-fault load (pre) components:
GE Multilin
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FAULT REPORTS FAULT REPORT 1(15)
FAULT 1
LINE ID: SRC 1
FAULT 1 DATE:
2000/08/11
FAULT 1 TIME:
00:00:00.000000
FAULT 1 TYPE:
ABG
FAULT 1 LOCATION
00.0 km
FAULT 1 RECLOSE
SHOT: 0
menu for assigning the source and trigger for fault calculations. Refer to the
FAULT REPORT 1
menu for manual clearing of the fault reports and to the
distance to fault
Local
Bus
Z mZ
I
A
A
E V
A F
V
A
Figure 6–4: EQUIVALENT SYSTEM FOR FAULT LOCATION
⋅ ⋅
V m Z I
= +
A A
I I
=
A AF
L90 Line Differential Relay
Range: SRC 1, SRC 2
Range: YYYY/MM/DD
Range: HH:MM:SS.ssssss
Range: where applicable; not seen if the source VTs are
in the "Delta" configuration
Range: where applicable; not seen if the source VTs are
in the "Delta" configuration
Range: where applicable
Remote
Bus
(1 – m)Z Z
I
B
B
R
F
V
B
⋅ ( )
R I I
+
F A B
I
+
Apre
6.4 RECORDS
6.4.1 FAULT REPORTS
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SETTINGS PRODUCT
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SETTINGS PRODUCT SETUP
B
(EQ 6.1)
(EQ 6.2)
6-19
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