GE L60, Инструкция по эксплуатации, Страница: 332 / 498

6-16 L60 Line Phase Comparison Relay GE Multilin
6.4 RECORDS 6 ACTUAL VALUES
6
6.4RECORDS 6.4.1 FAULT REPORTS
PATH: ACTUAL VALUES RECORDS FAULT REPORTS FAULT REPORT 1(15)
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
SETTINGS PRODUCT
SETUP FAULT REPORTS FAULT REPORT 1
menu for assigning the source and trigger for fault calculations. Refer to the
COMMANDS CLEAR RECORDS
menu for manual clearing of the fault reports and to the
SETTINGS PRODUCT SETUP
CLEAR RELAY RECORDS
menu for automated clearing of the fault reports.
The fault locator does not report fault type or location if the source VTs are connected in the Delta configuration.
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.
Figure 6–4: EQUIVALENT SYSTEM FOR FAULT LOCATION
The following equations hold true for this equivalent system.
(EQ 6.1)
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:
(EQ 6.2)
NO FAULTS TO REPORT
or
FAULT REPORT 1 FAULT 1
LINE ID: SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4
MESSAGE
FAULT 1 DATE:
2000/08/11
Range: YYYY/MM/DD
MESSAGE
FAULT 1 TIME:
00:00:00.000000
Range: HH:MM:SS.ssssss
MESSAGE
FAULT 1 TYPE:
ABG
Range: not available if the source VTs are in the “Delta”
configuration
MESSAGE
FAULT 1 LOCATION
00.0 km
Range: not available if the source VTs are in the “Delta”
configuration
MESSAGE
FAULT 1 RECLOSE
SHOT: 0
Range: where applicable
NOTE
mZ (1 – m)Z
R
F
Z
A
Z
B
E
A
E
B
V
A
V
B
V
F
I
A
I
B
Local
Bus
Remote
Bus
distance to fault
V
A
m Z I
A
⋅ ⋅ R
F
I
A
I
B
+
( ) ⋅
+ =
I
A
I
AF
I
Apre
+ =