CHAPTER 5: SETPOINTS
5.4 PROTECTION ELEMENTS
GEK-106310-AF
F650 DIGITAL BAY CONTROLLER
5-73
Table 5-41: Quantities
5.4.5 Ground current
The Ground Current menu incorporates the following overcurrent elements:
Ground time overcurrent (51G)
Ground instantaneous overcurrent (50G)
Ground directional element (67G)
5.4.5.1 Ground time-delayed overcurrent element (51G)
Ground TOC is a ground time delayed overcurrent protection element. The ground current is measured from the ground
input, terminals B9-B10, and it may be programmed as Fundamental phasor magnitude or RMS magnitude as required by
the application. The element trip can be time delayed using a selectable curve. It incorporates a reset time that is
selectable between instantaneous or linear.
Table 5-42: 51G element settings
The snapshot event setting enables or disables the snapshot event generation for this element.
POLARIZING MODE
DIRECTION
COMPARED PHASORS
VOLTAGE (Vo)
FORWARD
-Vo
Io x 1 MTA
REVERSE
-Vo
-Io x 1 MTA
CURRENT (Ip)
FORWARD
Isg
Io
REVERSE
Isg
-Io
Vo + Ip
FORWARD
- Vo
Io
or
Isg
Io
REVERSE
- Vo
-Io
or
Isg
-Io
Vo * Ip
FORWARD
- Vo
Io
and
Isg
Io
REVERSE
- Vo
-Io
and
Isg
-Io
SETPOINT > PROTECTION ELEMENT > SETTING GROUP X > Ground Current > Ground TOC
Ground TOC 1> Ground TOC 2 > Ground TOC 3
setting Description
Name
Default Value
Step
Range
Function permission
Function
DISABLED
N/A
[DISABLED – ENABLED]
Input type
Input
PHASOR(DFT)
N/A
[PHASOR – RMS]
Pickup level
Pickup Level
1.00
0.01 A
[0.05 : 160.00]
Curve shape
Curve
IEEE Ext Inv
N/A
[See list of curves]
Time Dial
TD Multiplier
1.00
0.01 s
[0.00 : 900.00]
Reset type
Reset
INSTANTANEOUS
N/A
[INSTANTANEOUS – LINEAR]
Snapshot Event generation
Snapshot Events
ENABLED
N/A
[DISABLED – ENABLED]
Summary of Contents for F650
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