5-76 F650 DIGITAL BAY CONTROLLER GEK-106310-AF
5.4 PROTECTION ELEMENTS CHAPTER 5: SETPOINTS
Table 5-47: Quantities
5.4.6 Sensitive ground current
The F650 Sensitive ground Current menu incorporates the following overcurrent elements:
• Sensitive ground time overcurrent (51SG)
• Sensitive ground instantaneous overcurrent (50SG)
• Isolated ground overcurrent (50IG)
• Sensitive ground directional overcurrent (67SG)
5.4.6.1 Sensitive ground time-delayed overcurrent element (51SG)
Sensitive Ground TOC is a sensitive ground time delayed overcurrent protection element with a setting range 0.005A to
16A. The sensitive ground current input quantity is measured from the sensitive ground input, terminals B11-B12, 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. And it incorporates a reset time selectable between instantaneous or
linear.
Table 5-48: 51SG 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 > Sensitive Ground Current > Sensitive Ground TOC
Sensitive Ground TOC 1> Sensitive Ground TOC 2 > Sensitive 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 0.050 0.001 A [0.005 : 16.000]
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]
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