GE T60 Instruction Manual page 366

5.6 GROUPED ELEMENTS
b) GROUND TIME OVERCURRENT (ANSI 51G, IEC PTOC)

PATH: SETTINGS GROUPED ELEMENTS
 GROUND TOC1

5
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.
These elements measure the current that is connected to the ground channel of a CT/VT module. The conversion
range of a standard channel is from 0.02 to 46 times the CT rating.
NOTE
This channel may be also equipped with a sensitive input. The conversion range of a sensitive channel is from
0.002 to 4.6 times the CT rating.
NOTE
5-230

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
SETTING
GROUND TOC1
FUNCTION:
Enabled = 1
SETTING
GROUND TOC1
AND
SOURCE:
IG
SETTING
GROUND TOC1
BLOCK:
Off = 0
Figure 5–114: GROUND TOC1 SCHEME LOGIC
T60 Transformer Protection System

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
SETTINGS
GROUND TOC1
INPUT:
GROUND TOC1
PICKUP:
GROUND TOC1
CURVE:
GROUND TOC1
TD MULTIPLIER:
GROUND TOC 1
RESET:
RUN
IG PICKUP
t
I
5 SETTINGS

GROUND TOC1(6)
FLEXLOGIC OPERANDS
GROUND TOC1 PKP
GROUND TOC1 DPO
GROUND TOC1 OP
827036A4.VSD
GE Multilin