Ground Current - GE B30 Instruction Manual

5.6 GROUPED ELEMENTS
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 0.9375 I
op injected
SETTING
NEUTRAL IOC1 FUNCTION:
Disabled=0
Enabled=1
SETTING
NEUTRAL IOC1 BLOCK:
Off=0
SETTING
NEUTRAL IOC1 SOURCE:
_0
a) GROUND TIME OVERCURRENT (ANSI 51G, IEC PTOC)

PATH: SETTINGS GROUPED ELEMENTS
5  GROUND TOC1

This element can provide a desired time-delay operating characteristic versus the applied current or be used as a simple
definite time element. The ground current input value is the quantity measured by the ground input CT and is the funda-
mental phasor or RMS magnitude. Two methods of resetting operation are available: "Timed" and "Instantaneous" (refer to
the Inverse time overcurrent curve characteristics section for details). When the element is blocked, the time accumulator
will reset according to the reset characteristic. For example, if the element reset characteristic is set to "Instantaneous" and
the element is blocked, the time accumulator will be cleared immediately.
5-134
; three-phase pure zero-sequence injection:
SETTING
NEUTRAL IOC1 PICKUP:
RUN
AND
3( _0 - K _1 ) PICKUP
Figure 5–54: 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

I 3 I
op injected
SETTINGS
NEUTRAL IOC1
PICKUP DELAY :
NEUTRAL IOC1
RESET DELAY :
t
PKP
t
RST


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
).
FLEXLOGIC OPERANDS
NEUTRAL IOC1 PKP
NEUTRAL IOC1 DPO
NEUTRAL IOC1 OP
827035A4.CDR
5.6.6 GROUND CURRENT

GROUND TOC1(6)
GE Multilin