Ground Current - GE B30 Instruction Manual

5.6 GROUPED ELEMENTS
• 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):
5
a) GROUND TIME OVERCURRENT (ANSI 51G, IEC PTOC)

PATH: SETTINGS GROUPED ELEMENTS
 GROUND TOC1

5-154
1
-- - ×
I
=
op
3
Figure 5–57: NEUTRAL IOC1 SCHEME LOGIC

SETTING GROUP 1(6)
GROUND TOC1
FUNCTION: Disabled
GROUND TOC1 SIGNAL
MESSAGE
SOURCE: SRC 1
GROUND TOC1
MESSAGE
INPUT: Phasor
GROUND TOC1
MESSAGE
PICKUP:
GROUND TOC1
MESSAGE
CURVE: IEEE Mod Inv
GROUND TOC1
MESSAGE
TD MULTIPLIER:
GROUND TOC1
MESSAGE
RESET: Instantaneous
GROUND TOC1 BLOCK:
MESSAGE
Off
GROUND TOC1
MESSAGE
TARGET: Self-reset
GROUND TOC1
MESSAGE
EVENTS: Disabled
B30 Bus Differential System
( )
3 K x I
–
injected


GROUND 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 the 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
(EQ 5.13)
5.6.6 GROUND CURRENT

GROUND TOC1(6)
GE Multilin