# Records; Fault Reports - GE UR Series Instruction Manual

Line differential relay.

## 6.4 RECORDS

6.4 RECORDS
PATH: ACTUAL VALUES
NO FAULTS TO REPORT
or
FAULT REPORT #
The latest 10 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 REPORT
CLEAR RECORDS
a) FAULT LOCATOR OPERATION
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 compo-
nents 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.
6
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.
V
m Z I
R
=
+
A
A
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:
I
I
I
=
+
A
AF
Apre
and neglecting shunt parameters of the line:
I
=
I
I
B
BF
Apre
6-18
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RECORDS

### FAULT REPORTS

FAULT #
2000/08/11
FAULT #
MESSAGE
00:00:00.000000
FAULT #
MESSAGE
ABG
FAULT #
MESSAGE
00.0 km
FAULT #
MESSAGE
SHOT: 0
menu for assigning the Source and Trigger for fault calculations. Refer to the
distance to fault
Local
Bus
Z
mZ
I
A
A
E
A
V
A
Figure 6–4: EQUIVALENT SYSTEM FOR FAULT LOCATION
(
)
I
I
eqn. 1
+
F
A
B
eqn. 2
eqn. 3
L90 Line Differential Relay
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Range: YYYY/MM/DD
DATE:
Range: HH:MM:SS.ssssss
TIME:
where applicable
TYPE:
where applicable
LOCATION
where applicable
RECLOSE
Remote
Bus
(1 – m)Z
I
B
V
R
F
F
V
B
6 ACTUAL VALUES
6.4.1 FAULT REPORTS
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SETTINGS
PRODUCT
COMMANDS
Z
B
E
B
GE Power Management
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