GE F650 User Manual

5-62 F650 Digital Bay Controller GEK-106310AB
5.4 PROTECTION ELEMENTS 5 SETTINGS
5
Table 5–51: 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 5–52: 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 ELEMENTS > 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]

GE F650 Specifications

General

Brand	GE
Model	F650
Category	Controller
Language	English