5-80
L90 Line Current Differential System
GE Multilin
5.4 SYSTEM SETUP
5 SETTINGS
5
b) VOLTAGE BANKS
PATH: SETTINGS
SYSTEM SETUP
AC INPUTS
VOLTAGE BANK F5(L5)
Because energy parameters are accumulated, these values should be recorded and then reset
immediately prior to changing VT characteristics.
Two banks of phase/auxiliary VTs can be set, where voltage banks are denoted in the following format (
X
represents the
module slot position letter):
Xa
, where
X
= {
F
,
L
} and
a
= {
5
}.
See the
Introduction to AC sources
section at the beginning of this chapter for additional details.
With VTs installed, the relay can perform voltage measurements as well as power calculations. Enter the
PHASE VT F5 CON-
NECTION
made to the system as “Wye” or “Delta”. An open-delta source VT connection would be entered as “Delta”.
The nominal
PHASE VT F5 SECONDARY
voltage setting is the voltage across the relay input terminals when nominal
voltage is applied to the VT primary.
For example, on a system with a 13.8 kV nominal primary voltage and with a 14400:120 volt VT in a delta connec-
tion, the secondary voltage would be 115; that is, (13800 / 14400) × 120. For a wye connection, the voltage value
entered must be the phase to neutral voltage which would be 115
= 66.4.
On a 14.4 kV system with a delta connection and a VT primary to secondary turns ratio of 14400:120, the voltage
value entered would be 120; that is, 14400 / 120.
5.4.2 POWER SYSTEM
PATH: SETTINGS
SYSTEM SETUP
POWER SYSTEM
The power system
NOMINAL FREQUENCY
value is used as a default to set the digital sampling rate if the system frequency
cannot be measured from available signals. This may happen if the signals are not present or are heavily distorted. Before
reverting to the nominal frequency, the frequency tracking algorithm holds the last valid frequency measurement for a safe
period of time while waiting for the signals to reappear or for the distortions to decay.
VOLTAGE BANK F5
PHASE VT F5
CONNECTION: Wye
Range: Wye, Delta
MESSAGE
PHASE VT F5
SECONDARY: 66.4 V
Range: 25.0 to 240.0 V in steps of 0.1
MESSAGE
PHASE VT F5
RATIO: 1.00 :1
Range: 1.00 to 24000.00 in steps of 0.01
MESSAGE
AUXILIARY VT F5
CONNECTION: Vag
Range: Vn, Vag, Vbg, Vcg, Vab, Vbc, Vca
MESSAGE
AUXILIARY VT F5
SECONDARY: 66.4 V
Range: 25.0 to 240.0 V in steps of 0.1
MESSAGE
AUXILIARY VT F5
RATIO: 1.00 :1
Range: 1.00 to 24000.00 in steps of 0.01
POWER SYSTEM
NOMINAL FREQUENCY:
60 Hz
Range: 25 to 60 Hz in steps of 1
MESSAGE
PHASE ROTATION:
ABC
Range: ABC, ACB
MESSAGE
FREQUENCY AND PHASE
REFERENCE: SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4
MESSAGE
FREQUENCY TRACKING:
Enabled
Range: Disabled, Enabled
NOTE
3
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 ...
