GE F60 Instruction Manual page 317

5 SETTINGS
• System unbalances under heavy load conditions
• Transformation errors of current transformers (CTs) during double-line and three-phase faults
• Switch-off transients during double-line and three-phase faults
The positive-sequence restraint must be considered when testing for pickup accuracy and response time (multiple of
pickup). The operating quantity depends on how test currents are injected into the relay (single-phase injection:
I 0.9375xI ; three-phase pure zero-sequence injection:
=
op injected
d) NEUTRAL DIRECTIONAL OVERCURRENT (ANSI 67N, IEC PDEF/PTOC)
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PATH: SETTINGS GROUPED ELEMENTS
 NEUTRAL
 DIRECTIONAL OC1
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GE Multilin
Figure 5–75: NEUTRAL IOC1 SCHEME LOGIC
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SETTING GROUP 1(6)
NEUTRAL DIR OC1
FUNCTION: Disabled
NEUTRAL DIR OC1
SOURCE: SRC 1
NEUTRAL DIR OC1
POLARIZING: Voltage
NEUTRAL DIR OC1 POL
VOLT: Calculated V0
NEUTRAL DIR OC1 OP
CURR: Calculated 3I0
NEUTRAL DIR OC1 POS-
SEQ RESTRAINT: 0.063
NEUTRAL DIR OC1
OFFSET: 0.00 Ω
NEUTRAL DIR OC1 FWD
ECA: 75° Lag
NEUTRAL DIR OC1 FWD
LIMIT ANGLE: 90°
NEUTRAL DIR OC1 FWD
PICKUP: 0.050 pu
NEUTRAL DIR OC1 REV
LIMIT ANGLE: 90°
NEUTRAL DIR OC1 REV
PICKUP: 0.050 pu
F60 Feeder Protection System
5.6 GROUPED ELEMENTS
×
I 3 I ).
=
op injected
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NEUTRAL CURRENT NEUTRAL DIRECTIONAL OC1(2)
Range: Disabled, Enabled
Range: SRC 1, SRC 2, SRC 3, SRC 4
Range: Voltage, Current, Dual, Dual-V, Dual-I
Range: Calculated V0, Aux. Voltage (VX)
Range: Calculated 3I0, Measured IG
Range: 0.000 to 0.500 in steps of 0.001
Ω
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
in steps of 0.01
5-185
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