GE L90 Instruction Manual page 505

CHAPTER 5: SETTINGS
— This setting specifies a multiple of the base curve shape specified by the
GROUND TOC1 TD MULTIPLIER
Programming this value to zero results in an instantaneous response to all current levels above pickup.
— The "Instantaneous" reset method is intended for applications with other relays, such as most static
GROUND TOC1 RESET
relays, which set the energy capacity directly to zero when the current falls below the reset threshold. The "Timed" reset
method can be used where the relay must coordinate with electromechanical relays.
— Assertion of the operand assigned to this setting blocks operation of the ground time overcurrent
GROUND TOC1 BLOCK
element.
— This setting enables and disables the logging of ground time overcurrent events in the sequence
GROUND TOC1 EVENTS
of events recorder.
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.
5.7.11.3 Ground instantaneous overcurrent (ANSI 50G, IEC PIOC)
SETTINGS  GROUPED ELEMENTS  SETTING GROUP 1(6)  GROUND CURRENT  GROUND IOC1(12)
 GROUND IOC1

The ground instantaneous overcurrent element can be used as an instantaneous element with no intentional delay or as a
definite time element. The ground current input is the quantity measured by the ground input CT and is the fundamental
phasor magnitude.
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
Figure 5-152: Ground TOC1 logic
GROUND IOC1

FUNCTION: Disabled
GROUND IOC1 SIGNAL

SOURCE: SRC 1
GROUND IOC1

PICKUP: 1.000 pu
GROUND IOC1 PICKUP

DELAY: 0.00 s
GROUND IOC1 RESET

DELAY: 0.00 s
GROUND IOC1 BLOCK:

Off
GROUND IOC1

TARGET: Self-reset
GROUND IOC1

EVENTS: Disabled
GROUPED ELEMENTS
Range: Disabled, Enabled
Range: SRC 1, SRC 2, SRC 3, SRC 4
Range: 0.020 to 30.000 pu in steps of 0.001
Range: 0.00 to 600.00 s in steps of 0.01
Range: 0.00 to 600.00 s in steps of 0.01
Range: FlexLogic operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
setting.
CURVE
5
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