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Ground Current - GE UR Series Instruction Manual

Line differential relay.
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5 SETTINGS
a) GROUND TOC1 / TOC2 (GROUND TIME OVERCURRENT: ANSI 51G)
ÖØ
PATH: SETTINGS
GROUPED ELEMENTS
GROUND TOC1
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
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.
SETTING
GROUND TOC1
FUNCTION:
Disabled = 0
Enabled = 1
SETTING
GROUND TOC1
SOURCE:
IG
SETTING
GROUND TOC1
BLOCK:
Off = 0
These elements measure the current that is connected to the ground channel of a CT/VT module. This channel
may be equipped with a standard or sensitive input. The conversion range of a standard channel is from 0.02 to 46
NOTE
times the CT rating. The conversion range of a sensitive channel is from 0.002 to 4.6 times the CT rating.
Once picked up, the GROUND TOCx PKP output operand remains picked up until the thermal memory of
the element resets completely. The PKP operand will not reset immediately after the operating current
NOTE
drops below the pickup threshold unless
GE Power Management
Ö
ÖØ
SETTING GROUP 1(8)
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
SETTINGS
GROUND TOC1
INPUT:
GROUND TOC1
PICKUP:
GROUND TOC1
CURVE:
GROUND TOC1
TD MULTIPLIER:
GROUND TOC 1
RESET:
AND
RUN
IG ≥ PICKUP
t
I
Figure 5–46: GROUND TOC1 SCHEME LOGIC
GROUND TOCx RESET
L90 Line Differential Relay
5.5 GROUPED ELEMENTS

5.5.14 GROUND CURRENT

Ö
GROUND CURRENT
GROUND TOC1
Range: Disabled, Enabled
Range: SRC 1, SRC 2,..., SRC 6
Range: Phasor, RMS
Range: 0.000 to 30.000 pu in steps of 0.001
Range: see 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
GROUND TOC1 PKP
GROUND TOC1 DPO
GROUND TOC1 OP
827036A3.VSD
is set to "Instantaneous".
5
5-99

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L90

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