GE L90 Instruction Manual page 285

CHAPTER 5: SETTINGS
The L90 incorporates a multi-ended fault locator method based on the synchronized voltage and current measurements
at all ends of the transmission line. This makes it possible to compute the fault location without assumptions or
approximations. This fault locator method is applicable on both two-terminal and three-terminal applications, with results
computed independently at each terminal. For three-terminal line applications, the fault locator is reports the exact line
segment at which the fault occurred and the distance to the fault from the terminal adjacent to the fault.
if charging current compensation is configured and enabled, the line charging current is removed at each terminal for
improved accuracy.
During communication channel failures, the L90 uses the single-ended algorithm to calculate and report fault location.
When the single-ended algorithm is used for three-terminal line applications, the faulted segment of the line is not
determined and reported.
The L90 relay supports one fault report and an associated fault locator per CT bank to a maximum of four. The signal
source and trigger condition, as well as the characteristics of the line or feeder, are entered in this menu.
The fault report stores data, in non-volatile memory, pertinent to an event when triggered. The captured data contained in
the FaultReport.txt file includes:
• Fault report number
• Name of the relay, programmed by the user
• Firmware revision of the relay
• Date and time of trigger
• Name of trigger (specific operand)
• Line or feeder ID via the name of a configured signal source
• Active setting group at the time of trigger
• Pre-fault current and voltage phasors (two cycles before either a 50DD disturbance associated with fault report
source or the trigger operate). Once a disturbance is detected, pre-fault phasors hold for three seconds waiting for the
fault report trigger. If trigger does not occur within this time, the values are cleared to prepare for the next disturbance.
• Fault current and voltage phasors (one cycle after the trigger)
• Elements operated at the time of triggering
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
FAULT REP 1 LENGTH

(km ): 100.0
FAULT REP 1 REM1-TAP

Z1 MAG: 3.00 Ω
FAULT REP 1 REM1-TAP

Z1 ANG: 75°
FAULT REP 1 REM1-TAP

LENGTH (km ): 100.0
FAULT REP 1 REM2-TAP

Z1 MAG: 3.00 Ω
FAULT REP 1 REM2-TAP

Z1 ANG: 75°
FAULT REP 1 REM2-TAP

LENGTH (km ): 100.0
FAULT REPORT 1 VT

SUBSTITUTION: None
FAULT REP 1 SYSTEM

Z0 MAG: 2.00 Ω
FAULT REP 1 SYSTEM

Z0 ANGLE: 75°
FAULT REPORT 1 Z0M

MAG: 0.00 Ω
Range: 0.0 to 2000.0 in steps of 0.1
Range: 0.01 to 250.00 ohms in steps of 0.01
Range: 25 to 90° in steps of 1
Range: 0.0 to 2000.0 in steps of 0.1
Range: 0.01 to 250.00 ohms in steps of 0.01
Range: 25 to 90° in steps of 1
Range: 0.0 to 2000.0 in steps of 0.1
Range: None, I0, V0
Range: 0.01 to 650.00 ohms in steps of 0.01
Range: 25 to 90° in steps of 1
Range: 0.00 to 650.00 ohms in steps of 0.01
PRODUCT SETUP
5
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