GE t60 Instruction Manual page 177

5 SETTINGS
b) GROUND TIME OVERCURRENT (ANSI 51G)
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 TOC Characteristics section for details). When the element is blocked, the time accumulator will reset accord-
ing 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. This channel
may be equipped with a standard or sensitive input. The conversion range of a standard channel is from 0.02 to 46
times the CT rating. The conversion range of a sensitive channel is from 0.002 to 4.6 times the CT rating.
NOTE
SETTING
GROUND TOC1
FUNCTION:
Disabled = 0
Enabled = 1
SETTING
GROUND TOC1
SOURCE:
IG
SETTING
GROUND TOC1
BLOCK:
Off = 0
GE Multilin
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
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 5–53: GROUND TOC1 SCHEME LOGIC
T60 Transformer Management Relay
5.5 GROUPED ELEMENTS
GROUND CURRENT GROUND TOC1(6)
Range: Disabled, Enabled
Range: SRC 1, SRC 2, SRC 3, SRC 4
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
GROUND TOC1 PKP
GROUND TOC1 DPO
GROUND TOC1 OP
827036A3.VSD
5
5-99