GE Multilin G650, Manual

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GEK-113285A G650 Generator Protection & Control System 5-59
5 SETTINGS 5.4 PROTECTION ELEMENTS
5
5.4.7 SENSITIVE GROUND CURRENT (ONLY FOR ENHANCED MODELS)
The G650 Sensitive ground Current menu incorporates the following overcurrent elements:
• Sensitive ground time overcurrent (51SG)
• Sensitive ground instantaneous overcurrent (50SG)
5.4.7.1 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 5–59: 51SG ELEMENT SETTINGS
The snapshot event setting enables or disables the snapshot event generation for this element.
5.4.7.2 SENSITIVE 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 5–60: 50SG ELEMENT SETTINGS
The snapshot event setting enables or disables the snapshot event generation for this element.
SETPOINT > PROTECTION ELEMENTS > 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]
SETPOINT > PROTECTION ELEMENTS > 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]