GE L90 Instruction Manual page 339

CHAPTER 5: SETTINGS
The EnerVista software is required to view all captured data. The relay faceplate display can be used to view the date and
time of trigger, the fault type, the distance location of the fault, and the reclose shot number.
The setting selects the source for input currents and voltages and disturbance detection. For dual-
FAULT REPORT 1 SOURCE
breaker applications where the line current is supplied individually from two breaker CTs, the fault locator source should
include the sum of currents from both CTs as well as the line voltage. For the application of entirely parallel lines, the fault
report can be programmed to apply compensation for the zero sequence mutual coupling between parallel lines when
calculating fault resistance and fault loop impedance. If this compensation is required, the ground current (3I_0) from the
parallel line must be connected to the ground input CT of the CT bank configured under the
the same polarity as the phase current input configured in the same source.
The setting assigns the FlexLogic operand representing the protection element/elements requiring
FAULT 1 REPORT TRIG
operational fault location calculations. The distance to fault calculations are initiated by this signal. The
, , and
MAG FAULT REPORT 1 Z0 MAG
For a two-terminal line application, the
and
REPORT 1 Z0 ANG FAULT REPORT 1 LENGTH
For the application of entirely parallel lines, Z0M MAG/ANG is the mutual zero-sequence impedance for the whole line,
required to compensate the calculation of fault resistance and fault loop impedance. For a three-terminal application,
these settings are used to enter the line segment impedance and length from the local terminal to the tap point only. The
figure shows the supported configurations of parallel lines in three-terminal applications.
Figure 5-49: Supported configurations of parallel lines in three-terminal applications
The
FAULT REP 1 REM1-TAP Z1 MAG
enter positive sequence section impedances (in secondary ohms) for the line segment from remote terminal 1 to the tap
point. The length of the line section from remote terminal 1 to the tap point is entered in the
setting.
The
FAULT REP 1 REM2-TAP Z1 MAG
above, but for the line segment from remote terminal 2 to the tap point.
The
FAULT REPORT 1 VT SUBSTITUTION
VTs are used, and the relay is supplied with the neutral (3V0) voltage, this setting is set to "V0". The method is still exact, as
the fault locator combines the line-to-line voltage measurements with the neutral voltage measurement to re-create the
line-to-ground voltages. See the
the delta and neutral voltages under the source indicated as input for the fault report. Also, the relay checks if the auxiliary
signal configured is marked as "Vn" by the user (under VT setup) and inhibits the fault location if the auxiliary signal is
labeled differently.
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
impedances are entered in secondary ohms.
FAULT REPORT 1 Z0M MAG
FAULT REPORT 1 Z1 MAG
settings for the entire line must to be entered for fault location calculations.
and
FAULT REP 1 REM1-TAP Z1 ANG
,
FAULT REP 1 REM2-TAP Z1 ANG
setting is set to "None" if the relay is fed from wye-connected VTs. If delta-connected
ACTUAL VALUES  RECORDS  FAULT REPORTS
, ,
FAULT REPORT 1 Z1 ANG FAULT REPORT 1 Z0 MAG
settings are used for three-terminal applications to
, and
FAULT REP 1 REM2-TAP LENGTH
menu for details. It is required to configure
PRODUCT SETUP
with
FAULT REPORT 1 SOURCE
FAULT REPORT 1 Z1
,
FAULT
FAULT REP 1 REM1-TAP LENGTH
settings are used as
5-115
5