GE F650 Instruction Manual page 210

5 SETTINGS
5.4.5.2 GROUND INSTANTANEOUS OVERCURRENT ELEMENT (50G)
Ground IOC is a ground instantaneous overcurrent protection element, with a setting range from 0.05 A to 160 A, which can
also be time delayed. The delay is selectable between 0.00 and 900 seconds. The ground current input quantity is
measured from the 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 5–53: 50G ELEMENT SETTINGS
SETPOINT > PROTECTION ELEMENTS > GROUND CURRENT > GROUND IOC
GROUND IOC 1> GROUND IOC 2 > GROUND IOC 3
SETTING DESCRIPTION
Function permission
Input type
Pickup level
Trip time
Reset time
Snapshot event generation
The snapshot event setting enables or disables the snapshot event generation for this element.
5.4.5.3 GROUND DIRECTIONAL ELEMENT (67G)
Ground directional is a directional protection element, used for monitoring the ground overcurrent elements. The operation
magnitude is the ground current measured directly from the corresponding input (B9-B10), while the polarization magnitude
is the neutral voltage (V ). The neutral voltage is calculated from the three phase voltages or measured from the dedicated
n
voltage input (A11-A12).
In case of using the voltage measured from the dedicated voltage input terminals, the Auxiliary Voltage setting in General
settings must be V .
N
If the F650 is set to have synchronism check protection, then this input will be adjusted as busbar voltage and it
will not be the 3V0 voltage (AUXILIARY VOLTAGE setting as VX)
If the F650 does not have a synchronism check element, then this input can be set as I
be used as polarization magnitude for the 67G element (AUXILIARY VOLTAGE setting as VN).
As in the case of a phase directional element, this element incorporates a voltage loss logic that allows blocking or
permitting the trip by means of a setting.
Table 5–54: 67G ELEMENT SETTINGS
SETPOINT > PROTECTION ELEMENTS > GROUND CURRENT > GROUND DIRECTIONAL >
GROUND DIRECTIONAL 1> GROUND DIRECTIONAL 2 > GROUND DIRECTIONAL 3
SETTING DESCRIPTION
Function permission
Maximum Torque Angle
Operation Direction
Polarization type
Block logic type
Polarization voltage threshold
Snapshot event generation
Operation of the Ground directional element 67G is similar to the operation of the neutral directional element 67N (refer to
section 5.4.4.3), with the exception that the operation magnitude here is the ground current Ig (67G), measured from the
input terminals B9-B10 instead of the Neutral current, In (67N), calculated from the phase currents.
GEK-106310AB
NAME DEFAULT VALUE STEP
Function DISABLED
Input PHASOR(DFT)
Pickup Level 30.00
Trip Delay 0.00
Reset Delay 0.00
Snapshot Events ENABLED
NAME DEFAULT VALUE STEP
Function DISABLED
MTA -45
Direction FORWARD
Polarization VO
Block Logic PERMISSION
Pol V Threshold 10
Snapshot Events ENABLED
F650 Digital Bay Controller
5.4 PROTECTION ELEMENTS
RANGE
N/A [DISABLED – ENABLED]
N/A [PHASOR – RMS]
0.01 A [0.05 : 160.00]
0.01 s [0.00 : 900.00]
0.01 s [0.00 : 900.00]
N/A [DISABLED – ENABLED]
neutral voltage, and it can
n
RANGE
N/A [DISABLED – ENABLED]
1 Deg [-90 : +90]
N/A [FORWARD – REVERSE]
N/A [V – I – V +I – V *I
0 P 0 P 0 P
N/A [BLOCK – PERMISSION]
1 V [0 : 300]
N/A [DISABLED – ENABLED]
5
]
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