GE Multilin F650 User Manual

GE Multilin F650 Digital Bay Controller 5-59
5 SETPOINTS 5.4 PROTECTION ELEMENTS
5
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 UNIT (51SG)
51SG unit is a sensitive ground time delayed overcurrent protection element with a setpoint range 0.005A to 16A. The
sensitive ground current input quantity is measured from the transformers module sensitive ground input, terminals B11-
B12, and it may be programmed as fundamental phasor magnitude or total waveform RMS magnitude as required by the
application. The unit trip can be time delayed using a selectable curve. And it incorporates a reset time selectable between
instantaneous or linear.
Table 5–54: 51SG UNIT SETPOINTS
The snapshot event setpoint enables or disables the snapshot event generation for this unit.
5.4.6.2 SENSITIVE GROUND INSTANTANEOUS OVERCURRENT UNIT (50SG)
50SG unit is a sensitive ground instantaneous overcurrent protection element, with a setpoint 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 transformers module sensitive ground input, and it may be programmed as fundamental phasor
magnitude or total waveform RMS magnitude as required by the application. The unit incorporates a reset time selectable
between 0 and 900 seconds, and a block input that resets the pickup and trip signals to 0. The unit outputs are the general
pickup and trip signals of the unit.
Table 5–55: 50SG UNIT SETPOINTS
The snapshot event setpoint enables or disables the snapshot event generation for this unit.
SETPOINT > PROTECTION ELEMENTS > SENSITIVE GROUND CURRENT > SENSITIVE GROUND TOC
SENSITIVE GROUND TOC 1> SENSITIVE GROUND TOC 2 > SENSITIVE GROUND TOC 3
SETPOINT 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]
SETPOINT > PROTECTION ELEMENTS > SENSITIVE GROUND CURRENT > SENSITIVE GROUND IOC
SENSITIVE GROUND IOC 1> SENSITIVE GROUND IOC 2 > SENSITIVE GROUND IOC 3
SETPOINT 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]

GE Multilin F650 Specifications

General

Brand	GE
Model	Multilin F650
Category	Controller
Language	English