5-202
L90 Line Current Differential System
GE Multilin
5.6 GROUPED ELEMENTS
5 SETTINGS
5
d) NEUTRAL DIRECTIONAL OVERCURRENT
(ANSI 67N, IEC PDEF/PTOC)
PATH: SETTINGS
GROUPED ELEMENTS
SETTING GROUP 1(6)
NEUTRAL CURRENT
NEUTRAL DIRECTIONAL OC1(2)
The neutral directional overcurrent element provides both forward and reverse fault direction indications the
NEUTRAL DIR
OC1 FWD
and
NEUTRAL DIR OC1 REV
operands, respectively. The output operand is asserted if the magnitude of the oper-
ating current is above a pickup level (overcurrent unit) and the fault direction is seen as
forward
or
reverse
, respectively
(directional unit).
The
overcurrent unit
responds to the magnitude of a fundamental frequency phasor of the either the neutral current calcu-
lated from the phase currents or the ground current. There are separate pickup settings for the forward-looking and
reverse-looking functions. If set to use the calculated 3I_0, the element applies a
positive-sequence restraint
for better per-
formance: a small user-programmable portion of the positive-sequence current magnitude is subtracted from the zero-
sequence current magnitude when forming the operating quantity.
(EQ 5.20)
The positive-sequence restraint allows for more sensitive settings by counterbalancing spurious zero-sequence currents
resulting from:
•
System unbalances under heavy load conditions.
NEUTRAL
DIRECTIONAL OC1
NEUTRAL DIR OC1
FUNCTION: Disabled
Range: Disabled, Enabled
MESSAGE
NEUTRAL DIR OC1
SOURCE: SRC 1
Range: SRC 1, SRC 2, SRC 3, SRC 4
MESSAGE
NEUTRAL DIR OC1
POLARIZING: Voltage
Range: Voltage, Current, Dual
MESSAGE
NEUTRAL DIR OC1 POL
VOLT: Calculated V0
Range: Calculated V0, Measured VX
MESSAGE
NEUTRAL DIR OC1 OP
CURR: Calculated 3I0
Range: Calculated 3I0, Measured IG
MESSAGE
NEUTRAL DIR OC1 POS-
SEQ RESTRAINT: 0.063
Range: 0.000 to 0.500 in steps of 0.001
MESSAGE
NEUTRAL DIR OC1
OFFSET: 0.00
Range: 0.00 to 250.00
in steps of 0.01
MESSAGE
NEUTRAL DIR OC1 FWD
ECA: 75° Lag
Range: –90 to 90° in steps of 1
MESSAGE
NEUTRAL DIR OC1 FWD
LIMIT ANGLE: 90°
Range: 40 to 90° in steps of 1
MESSAGE
NEUTRAL DIR OC1 FWD
PICKUP: 0.050 pu
Range: 0.006 to 30.000 pu in steps of 0.001
MESSAGE
NEUTRAL DIR OC1 REV
LIMIT ANGLE: 90°
Range: 40 to 90° in steps of 1
MESSAGE
NEUTRAL DIR OC1 REV
PICKUP: 0.050 pu
Range: 0.006 to 30.000 pu in steps of 0.001
MESSAGE
NEUTRAL DIR OC1 BLK:
Off
Range: FlexLogic operand
MESSAGE
NEUTRAL DIR OC1
TARGET: Self-reset
Range: Self-reset, Latched, Disabled
MESSAGE
NEUTRAL DIR OC1
EVENTS: Disabled
Range: Disabled, Enabled
I
op
3
I_0
K
I_1
–
=
Содержание UR Series L90
Страница 14: ...xiv L90 Line Current Differential System GE Multilin 0 1 BATTERY DISPOSAL 0 BATTERY DISPOSAL 0 ...
Страница 68: ...2 34 L90 Line Current Differential System GE Multilin 2 4 SPECIFICATIONS 2 PRODUCT DESCRIPTION 2 ...
Страница 138: ...4 30 L90 Line Current Differential System GE Multilin 4 3 FACEPLATE INTERFACE 4 HUMAN INTERFACES 4 ...
Страница 604: ...9 58 L90 Line Current Differential System GE Multilin 9 6 FAULT LOCATOR 9 THEORY OF OPERATION 9 ...
Страница 652: ...A 16 L90 Line Current Differential System GE Multilin A 1 PARAMETER LISTS APPENDIX A A ...
Страница 772: ...B 120 L90 Line Current Differential System GE Multilin B 4 MEMORY MAPPING APPENDIX B B ...
Страница 802: ...C 30 L90 Line Current Differential System GE Multilin C 7 LOGICAL NODES APPENDIX C C ...
Страница 812: ...D 10 L90 Line Current Differential System GE Multilin D 1 IEC 60870 5 104 APPENDIX D D ...
Страница 824: ...E 12 L90 Line Current Differential System GE Multilin E 2 DNP POINT LISTS APPENDIX E E ...
Страница 834: ...F 10 L90 Line Current Differential System GE Multilin F 3 WARRANTY APPENDIX F F ...
Страница 846: ...xii L90 Line Current Differential System GE Multilin INDEX ...