GE L60 Instruction Manual page 314

Line phase comparison system, ur series
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5.5 GROUPED ELEMENTS
d) NEUTRAL DIRECTIONAL OVERCURRENT (ANSI 67N, IEC PDEF/PTOC)

PATH: SETTINGS
GROUPED ELEMENTS
 NEUTRAL
 DIRECTIONAL OC1
5
The neutral directional overcurrent element provides both forward and reverse fault direction indications the
and
OC1 FWD
NEUTRAL DIR OC1 REV
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.
The positive-sequence restraint allows for more sensitive settings by counterbalancing spurious zero-sequence currents
resulting from:
System unbalances under heavy load conditions.
5-176
SETTING GROUP 1(6)
NEUTRAL DIR OC1
FUNCTION: Disabled
NEUTRAL DIR OC1
MESSAGE
SOURCE: SRC 1
NEUTRAL DIR OC1
MESSAGE
POLARIZING: Voltage
NEUTRAL DIR OC1 POL
MESSAGE
VOLT: Calculated V0
NEUTRAL DIR OC1 OP
MESSAGE
CURR: Calculated 3I0
NEUTRAL DIR OC1 POS-
MESSAGE
SEQ RESTRAINT: 0.063
NEUTRAL DIR OC1
MESSAGE
OFFSET: 0.00 Ω
NEUTRAL DIR OC1 FWD
MESSAGE
ECA: 75° Lag
NEUTRAL DIR OC1 FWD
MESSAGE
LIMIT ANGLE: 90°
NEUTRAL DIR OC1 FWD
MESSAGE
PICKUP: 0.050 pu
NEUTRAL DIR OC1 REV
MESSAGE
LIMIT ANGLE: 90°
NEUTRAL DIR OC1 REV
MESSAGE
PICKUP: 0.050 pu
NEUTRAL DIR OC1 BLK:
MESSAGE
Off
NEUTRAL DIR OC1
MESSAGE
TARGET: Self-reset
NEUTRAL DIR OC1
MESSAGE
EVENTS: Disabled
operands, respectively. The output operand is asserted if the magnitude of the oper-
×
I
3
=
op
L60 Line Phase Comparison System
NEUTRAL CURRENT
Range: Disabled, Enabled
Range: SRC 1, SRC 2, SRC 3, SRC 4
Range: Voltage, Current, Dual
Range: Calculated V0, Measured VX
Range: Calculated 3I0, Measured IG
Range: 0.000 to 0.500 in steps of 0.001
Range: 0.00 to 250.00
Range: –90 to 90° in steps of 1
Range: 40 to 90° in steps of 1
Range: 0.006 to 30.000 pu in steps of 0.001
Range: 40 to 90° in steps of 1
Range: 0.006 to 30.000 pu in steps of 0.001
Range: FlexLogic™ operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
(
×
)
I_0
K
I_1
5 SETTINGS

NEUTRAL DIRECTIONAL OC1(2)
Ω
in steps of 0.01
NEUTRAL DIR
(EQ 5.19)
GE Multilin

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