5-58
L90 Line Current Differential System
GE Multilin
5.2 PRODUCT SETUP
5 SETTINGS
5
For a two-terminal line application, the
FAULT REPORT 1 Z1 MAG
,
FAULT REPORT 1 Z1 ANG
,
FAULT REPORT 1 Z0 MAG
,
FAULT
REPORT 1 Z0 ANG
and
FAULT REPORT 1 LENGTH
settings for the entire line must to be entered for fault location calculations.
For a three-terminal application, these settings are used to enter the line segment impedance and length from the local ter-
minal to the tap point only.
The
FAULT REP 1 REM1-TAP Z1 MAG
and
FAULT REP 1 REM1-TAP Z1 ANG
settings are used for three-terminal applications to
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
FAULT REP 1 REM1-TAP LENGTH
setting.
The
FAULT REP 1 REM2-TAP Z1 MAG
,
FAULT REP 1 REM2-TAP Z1 ANG
, and
FAULT REP 1 REM2-TAP LENGTH
settings are used as
above, but for the line segment from remote terminal 2 to the tap point.
The
FAULT REPORT 1 VT SUBSTITUTION
setting shall be set to “None” if the relay is fed from wye-connected VTs. If delta-con-
nected VTs are used, and the relay is supplied with the neutral (3V0) voltage, this setting shall be set to “V0”. The method is
still exact, as the fault locator would combine the line-to-line voltage measurements with the neutral voltage measurement
to re-create the line-to-ground voltages. See the
ACTUAL VALUES
RECORDS
FAULT REPORTS
menu for additional
details. It required to configure the delta and neutral voltages under the source indicated as input for the fault report. Also,
the relay will check if the auxiliary signal configured is marked as “Vn” by the user (under VT setup), and inhibit the fault
location if the auxiliary signal is labeled differently.
If the broken-delta neutral voltage is not available to the relay, an approximation is possible by assuming the missing zero-
sequence voltage to be an inverted voltage drop produced by the zero-sequence current and the user-specified equivalent
zero-sequence system impedance behind the relay: V0 = –Z0
I0. In order to enable this mode of operation, the
FAULT
REPORT 1 VT SUBSTITUTION
setting shall be set to “I0”.
The
FAULT REP 1 SYSTEM Z0 MAG
and
FAULT REP 1 SYSTEM Z0 ANGLE
settings are used only when the
VT SUBSTITUTION
set-
ting value is “I0”. The magnitude is to be entered in secondary ohms. This impedance is an average system equivalent
behind the relay. It can be calculated as zero-sequence Thevenin impedance at the local bus with the protected line/feeder
disconnected. The method is accurate only if this setting matches perfectly the actual system impedance during the fault. If
the system exhibits too much variability, this approach is questionable and the fault location results for single-line-to-ground
faults shall be trusted with accordingly. It should be kept in mind that grounding points in vicinity of the installation impact
the system zero-sequence impedance (grounded loads, reactors, zig-zag transformers, shunt capacitor banks, etc.).
For proper operation of the multi-ended fault locator, the nominal primary voltage is expected to appear identical at
all line terminals as seen from the nominal secondary voltage, VT ratio, and VT connection settings of the first 87L
source.
5.2.9 OSCILLOGRAPHY
a) MAIN MENU
PATH: SETTINGS
PRODUCT SETUP
OSCILLOGRAPHY
OSCILLOGRAPHY
NUMBER OF RECORDS:
5
Range: 1 to 64 in steps of 1
MESSAGE
TRIGGER MODE:
Automatic Overwrite
Range: Automatic Overwrite, Protected
MESSAGE
TRIGGER POSITION:
50%
Range: 0 to 100% in steps of 1
MESSAGE
TRIGGER SOURCE:
Off
Range: FlexLogic operand
MESSAGE
AC INPUT WAVEFORMS:
16 samples/cycle
Range: Off; 8, 16, 32, 64 samples/cycle
MESSAGE
DIGITAL CHANNELS
MESSAGE
ANALOG CHANNELS
NOTE
Summary of Contents for UR Series L90
Page 652: ...A 16 L90 Line Current Differential System GE Multilin A 1 PARAMETER LISTS APPENDIX A A ...
Page 772: ...B 120 L90 Line Current Differential System GE Multilin B 4 MEMORY MAPPING APPENDIX B B ...
Page 802: ...C 30 L90 Line Current Differential System GE Multilin C 7 LOGICAL NODES APPENDIX C C ...
Page 812: ...D 10 L90 Line Current Differential System GE Multilin D 1 IEC 60870 5 104 APPENDIX D D ...
Page 824: ...E 12 L90 Line Current Differential System GE Multilin E 2 DNP POINT LISTS APPENDIX E E ...
Page 834: ...F 10 L90 Line Current Differential System GE Multilin F 3 WARRANTY APPENDIX F F ...
Page 846: ...xii L90 Line Current Differential System GE Multilin INDEX ...