Neutral Current - GE B30 Instruction Manual

5.6 GROUPED ELEMENTS
SETTING
PHASE IOC1
FUNCTION:
Enabled = 1
Disabled = 0
SETTING
PHASE IOC1
SOURCE:
IA
IB
IC
SETTING
PHASE IOC1
BLOCK-A:
Off = 0
SETTING
PHASE IOC1
BLOCK-B:
Off = 0
SETTING
PHASE IOC1
BLOCK-C:
Off = 0
Figure 5–52: PHASE INSTANTANEOUS OVERCURRENT 1 SCHEME LOGIC
a) NEUTRAL TIME OVERCURRENT (ANSI 51N, IEC PTOC)

PATH: SETTINGS GROUPED ELEMENTS
5
 NEUTRAL TOC1

The neutral time overcurrent element can provide a desired time-delay operating characteristic versus the applied current
or be used as a simple definite time element. The neutral current input value is a quantity calculated as 3Io from the phase
currents and may be programmed as fundamental phasor magnitude or total waveform RMS magnitude as required by the
application.
5-132
SETTING
PHASE IOC1
PICKUP:
AND RUN
IA ≥ PICKUP
AND RUN
IB ≥ PICKUP
AND RUN
IC ≥ PICKUP

SETTING GROUP 1(6)
NEUTRAL TOC1
FUNCTION: Disabled
NEUTRAL TOC1 SIGNAL
MESSAGE
SOURCE: SRC 1
NEUTRAL TOC1
MESSAGE
INPUT: Phasor
NEUTRAL TOC1
MESSAGE
PICKUP:
NEUTRAL TOC1
MESSAGE
CURVE: IEEE Mod Inv
NEUTRAL TOC1
MESSAGE
TD MULTIPLIER:
NEUTRAL TOC1
MESSAGE
RESET: Instantaneous
NEUTRAL TOC1 BLOCK:
MESSAGE
Off
NEUTRAL TOC1
MESSAGE
TARGET: Self-reset
NEUTRAL TOC1
MESSAGE
EVENTS: Disabled
B30 Bus Differential System
SETTINGS
PHASE IOC1
PICKUPDELAY:
PHASE IOC1 RESET
DELAY:
t
PKP
t
RST
t
PKP
t
RST
t
PKP
t
RST


NEUTRAL CURRENT

Range: Disabled, Enabled
Range: SRC 1, SRC 2, SRC 3, SRC 4, SRC 5, SRC 6
Range: Phasor, RMS
Range: 0.000 to 30.000 pu in steps of 0.001
1.000 pu
Range: See OVERCURRENT CURVE TYPES table
Range: 0.00 to 600.00 in steps of 0.01
1.00
Range: Instantaneous, Timed
Range: FlexLogic operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
5 SETTINGS
FLEXLOGIC
OPERANDS
PHASE IOC1 A PKP
PHASE IOC1 A DPO
PHASE IOC1 B PKP
PHASE IOC1 B DPO
PHASE IOC1 C PKP
PHASE IOC1 C DPO
PHASE IOC1 A OP
PHASE IOC1 B OP
PHASE IOC1 C OP
OR PHASE IOC1 PKP
OR PHASE IOC1 OP
AND PHASE IOC1 DPO
827033A6.VSD
5.6.5 NEUTRAL CURRENT

NEUTRAL TOC1
GE Multilin