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GE Multilin
L60 Line Phase Comparison Relay
5-129
5 SETTINGS
5.5 GROUPED ELEMENTS
5
d) NEUTRAL DIRECTIONAL OVERCURRENT
(ANSI 67N)
PATH: SETTINGS
GROUPED ELEMENTS SETTING GROUP 1(6) NEUTRAL CURRENT
NEUTRAL DIRECTIONAL OC1(2)
There are two Neutral Directional Overcurrent protection elements available. The 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 operating current is above a pickup level (overcurrent unit) and the fault direc-
tion 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 two separate pickup settings for the forward- and reverse-
looking functions, respectively. If set to use the calculated 3I_0, the element applies a “positive-sequence restraint” for bet-
ter performance: 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 5.16)
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
Ω
Range: 0.00 to 250.00
Ω
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: 0.002 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: 0.002 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 L60
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Страница 24: ...1 14 L60 Line Phase Comparison Relay GE Multilin 1 5 USING THE RELAY 1 GETTING STARTED 1...
Страница 42: ...2 18 L60 Line Phase Comparison Relay GE Multilin 2 2 SPECIFICATIONS 2 PRODUCT DESCRIPTION 2...
Страница 78: ...3 36 L60 Line Phase Comparison Relay GE Multilin 3 3 DIRECT INPUT OUTPUT COMMUNICATIONS 3 HARDWARE 3...
Страница 368: ...8 28 L60 Line Phase Comparison Relay GE Multilin 8 2 SINGLE POLE TRIPPING 8 THEORY OF OPERATION 8...
Страница 470: ...D 10 L60 Line Phase Comparison Relay GE Multilin D 1 PROTOCOL APPENDIXD D...
Страница 482: ...E 12 L60 Line Phase Comparison Relay GE Multilin E 2 DNP POINT LISTS APPENDIXE E...
Страница 498: ...x L60 Line Phase Comparison Relay GE Multilin INDEX Z ZERO SEQUENCE CORE BALANCE 3 9...