CHAPTER 5: SETPOINTS
5.4 PROTECTION ELEMENTS
GEK-106310-AF
F650 DIGITAL BAY CONTROLLER
5-77
5.4.6.2 Senstitive ground instantaneous overcurrent element (50SG)
50SG is a sensitive ground instantaneous overcurrent protection element, with a setting range from 0.005 A to 16.00 A,
which can also be time delayed, with a delay selectable between 0 and 900 seconds. The ground current input quantity is
measured from the sensitive ground input, and it may be programmed as fundamental phasor magnitude or RMS
magnitude as required by the application. The element incorporates a reset time selectable between 0 and 900 seconds,
and a block input that resets the pickup and trip signals to 0. The element outputs are the general pickup and trip signals of
the element.
Table 5-49: 50SG element settings
The snapshot event setting enables or disables the snapshot event generation for this element.
5.4.6.3 Instantaneous overcurrent element for ungrounded systems (50IG)
The operation of this element is similar to sensitive ground overcurrent elements; the difference is that in this case, 3I0
current is capacitive, and uses very reduced magnitudes (0.5-10.0 A primary values).
The operation characteristic is shown on figure Figure 5-14: Operations characteristics, element 50IG, where Vh, Vl, Ih and
Il are element settings.
Figure 5-14: Operations characteristics, element 50IG
SETPOINT > PROTECTION ELEMENT > SETTING GROUP X > Sensitive Ground Current > Sensitive Ground IOC
Sensitive Ground IOC 1> Sensitive Ground IOC 2 > Sensitive Ground IOC 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
0.100
0.001 A
[0.005 : 16.000]
Trip time
Trip Delay
0.00
0.01 s
[0.00 : 900.00]
Reset time
Reset Delay
0.00
0.01 s
[0.00 : 900.00]
Snapshot event generation
Snapshot Events
ENABLED
N/A
[DISABLED – ENABLED]
Operation Area
I
h
I
l
V
l
V
h
V
n
=3V
0
I
n
=3I
0
Summary of Contents for F650
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