GE 745 Instruction Manual page 165

CHAPTER 5: SETPOINTS
5.6.7 Ground Overcurrent
5.6.7.1 Main Menu
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GROUND OC
745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
PATH: SETPOINTS S4 ELEMENTS
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In the 745, "ground" refers to the current measured in a CT in the connection between the
transformer neutral and ground. The 745 has two ground inputs which could be assigned
to any of the three windings, based on the transformer type selected with respect to the
rules in table 3-2.
As the ground overcurrent settings corresponding to the winding-assigned ground inputs,
are displayed and enabled. This section contains the settings to configure the ground
overcurrent elements. Included are ground time overcurrents for each associated winding,
and two levels of ground instantaneous overcurrent for each associated winding.
GROUND OC
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W1 GND [ ]
TIME OC
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W2 GND [ ]
TIME OC
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W3 GND [ ]
TIME OC
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W1 GND [ ]
INST OC 1
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W2 GND [ ]
INST OC 1
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W3 GND [ ]
INST OC 1
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W1 GND [ ]
INST OC 2
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W2 GND [ ]
INST OC 2
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W3 GND [ ]
INST OC 2
S4 ELEMENTS
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