EMR-5000
IM02602012E
System Parameters of the Ground Differential
Parameter
Description
Setting range
Default
Menu path
CT pri
Nominal current of the primary side of the current
transformers.
1 - 50000A
500A
[System Para
/CT Diff]
CT sec
Nominal current of the secondary side of the current
transformers.
1A,
5A
5A
[System Para
/CT Diff]
CT dir
Protection functions with directional feature can only work
properly if the connection of the current transformers is
free of wiring errors. If all current transformers are
connected to the device with an incorrect polarity, the
wiring error can be compensated by this parameter. This
parameter turns the current vectors by 180 degrees.
0°,
180°
0°
[System Para
/CT Diff]
XCT pri
This parameter defines the primary nominal current of
the connected ground current transformer. If the ground
current is measured via the Residual connection, the
primary value of the phase current transformer must be
entered here.
1 - 50000A
50A
[System Para
/CT Diff]
XCT sec
This parameter defines the secondary nominal current of
the connected ground current transformer. If the ground
current is done via the Residual connection, the primary
value of the phase current transformer must be entered
here.
1A,
5A
5A
[System Para
/CT Diff]
XCT dir
Ground fault protection with directional feature depends
also on the correct wiring of the ground current
transformer. An incorrect polarity/wiring can be corrected
by means of the settings "0°" or "180°". The operator has
the possibility of turning the current vector by "180°"
(change of sign) without modification of the wiring. This
means, that – in terms of figures - the determined current
indicator was turned by "180°" by the device.
0°,
180°
0°
[System Para
/CT Diff]
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