GE Multilin
L90 Line Current Differential System
5-19
5 SETTINGS
5.2 PRODUCT SETUP
5
components. The cut-off operation applies to quantities used for metering, protection, and control, as well as those
used by communications protocols. Raw samples of the voltages available via oscillography are not subject cut-off.
The
CURRENT CUT-OFF LEVEL
and the
VOLTAGE CUT-OFF LEVEL
are used to determine the metered power cut-off levels. The
power cut-off level is calculated as shown below. For Delta connections:
(EQ 5.3)
For Wye connections:
(EQ 5.4)
(EQ 5.5)
where VT primary = VT secondary
VT ratio and CT primary = CT secondary
CT ratio.
For example, given the following settings:
CURRENT CUT-OFF LEVEL
: “0.02 pu”
VOLTAGE CUT-OFF LEVEL
: “1.0 V”
PHASE CT PRIMARY
: “100 A”
PHASE VT SECONDARY
: “66.4 V”
PHASE VT RATIO
: “208.00 : 1"
PHASE VT CONNECTION
: “Delta”.
We have:
CT primary = “100 A”, and
VT primary =
PHASE VT SECONDARY
x
PHASE VT RATIO
= 66.4 V x 208 = 13811.2 V
The power cut-off is therefore:
power cut-off = (
CURRENT CUT-OFF LEVEL
VOLTAGE CUT-OFF LEVEL
CT primary
VT primary)/VT secondary
= (
0.02 pu
1.0 V
100 A
13811.2 V) / 66.4 V
= 720.5 watts
Any calculated power value below this cut-off will not be displayed. As well, the three-phase energy data will not accumu-
late if the total power from all three phases does not exceed the power cut-off.
Lower the VOLTAGE CUT-OFF LEVEL and CURRENT CUT-OFF LEVEL with care as the relay accepts lower sig-
nals as valid measurements. Unless dictated otherwise by a specific application, the default settings of “0.02 pu” for
CURRENT CUT-OFF LEVEL and “1.0 V” for VOLTAGE CUT-OFF LEVEL are recommended.
5.2.4 CLEAR RELAY RECORDS
PATH: SETTINGS
PRODUCT SETUP
CLEAR RELAY RECORDS
CLEAR RELAY
RECORDS
CLEAR FAULT REPORTS:
Off
Range: FlexLogic operand
MESSAGE
CLEAR EVENT RECORDS:
Off
Range: FlexLogic operand
MESSAGE
CLEAR OSCILLOGRAPHY?
No
Range: FlexLogic operand
MESSAGE
CLEAR DATA LOGGER:
Off
Range: FlexLogic operand
MESSAGE
CLEAR ARC AMPS 1:
Off
Range: FlexLogic operand
MESSAGE
CLEAR ARC AMPS 2:
Off
Range: FlexLogic operand
3-phase power cut-off
3
CURRENT CUT-OFF LEVEL
VOLTAGE CUT-OFF LEVEL
VT primary
CT primary
VT secondary
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
=
3-phase power cut-off
3
CURRENT CUT-OFF LEVEL
VOLTAGE CUT-OFF LEVEL
VT primary
CT primary
VT secondary
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
=
per-phase power cut-off
CURRENT CUT-OFF LEVEL
VOLTAGE CUT-OFF LEVEL
VT primary
CT primary
VT secondary
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
=
3
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 ...
