Ground Current - GE B30 UR Series Instruction Manual

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:
I 0.9375xI ; three-phase pure zero-sequence injection:
=
op injected
SETTING
NEUTRAL IOC1 FUNCTION:
Disabled=0
Enabled=1
SETTING
AND
NEUTRAL IOC1 BLOCK:
Off=0
SETTING
NEUTRAL IOC1 SOURCE:
_0
a) GROUND TIME OVERCURRENT (ANSI 51G, IEC PTOC)

PATH: SETTINGS GROUPED ELEMENTS
 GROUND TOC1

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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.
GE Multilin
SETTINGS
NEUTRAL IOC1
PICKUP DELAY :
SETTING
NEUTRAL IOC1
NEUTRAL IOC1 PICKUP:
RESET DELAY :
RUN t
PKP
3( _0 - K _1 ) PICKUP
Figure 5–54: NEUTRAL IOC1 SCHEME LOGIC
 
SETTING GROUP 1(6)
GROUND TOC1
FUNCTION: Disabled
GROUND TOC1 SIGNAL
SOURCE: SRC 1
GROUND TOC1
INPUT: Phasor
GROUND TOC1
PICKUP: 1.000 pu
GROUND TOC1
CURVE: IEEE Mod Inv
GROUND TOC1
TD MULTIPLIER: 1.00
GROUND TOC1
RESET: Instantaneous
GROUND TOC1 BLOCK:
Off
GROUND TOC1
TARGET: Self-reset
GROUND TOC1
EVENTS: Disabled
B30 Bus Differential System
5.6 GROUPED ELEMENTS
×
I 3 I ).
=
op injected
t
RST

5.6.6 GROUND CURRENT


GROUND CURRENT GROUND TOC1(6)
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
Range: see the Overcurrent Curve Types table
Range: 0.00 to 600.00 in steps of 0.01
Range: Instantaneous, Timed
Range: FlexLogic operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
FLEXLOGIC OPERANDS
NEUTRAL IOC1 PKP
NEUTRAL IOC1 DPO
NEUTRAL IOC1 OP
827035A4.CDR
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