GE L30 Instruction Manual page 387

CHAPTER 5: SETTINGS
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):
— This setting enables and disables the neutral instantaneous overcurrent protection element.
NEUTRAL IOC1 FUNCTION
NEUTRAL IOC1 SIGNAL SOURCE
element.
— This setting specifies the neutral instantaneous overcurrent pickup level in per-unit values.
NEUTRAL IOC1 PICKUP
— This setting delays the assertion of the
NEUTRAL IOC1 PICKUP DELAY
coordination with other elements and relays.
— This setting specifies a delay for the reset of the neutral instantaneous overcurrent element
NEUTRAL IOC1 RESET DELAY
between the operate output state and the return to logic 0 after the input passes outside the defined pickup range. This
setting is used to ensure that the relay output contacts are closed long enough to ensure reception by downstream
equipment.
— Assertion of the operand assigned to this setting blocks operation of the neutral instantaneous
NEUTRAL IOC1 BLOCK
overcurrent element.
— This setting enables and disables the logging of neutral instantaneous overcurrent events in the
NEUTRAL IOC1 EVENTS
sequence of events recorder.
5.7.5.4 Neutral directional overcurrent (ANSI 67N, IEC PDEF/PTOC)
SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  NEUTRAL CURRENT  NEUTRAL DIRECTIONAL
OC1(2)
 NEUTRAL
 DIRECTIONAL OC1
L30 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
— This setting selects the signal source for the neutral instantaneous overcurrent protection
Figure 5-103: Neutral IOC1 logic
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
operands. It is used to achieve timing
NEUTRAL IOC OP
Range: Disabled, Enabled
Range: SRC 1, SRC 2
Range: Voltage, Current, Dual, Dual-V, Dual-I
Range: Calculated V0, Measured VX
Range: Calculated 3I0, Measured IG
Range: 0.000 to 0.500 in steps of 0.001
GROUPED ELEMENTS
Eq. 5-23
5
5-209