2.8 Earth fault protection I0>
(50N/51N)
VAMP 24h support phone +358 (0)20 753 3264
Inverse time limitation
The maximum measured secondary residual current is 10xI
0N
and maximum measured phase current is 50xI
N
. This limits the
scope of inverse curves with high pick-up settings. See chapter
2.14 for more information.
Setting groups
There are two settings groups available for each stage.
Switching between setting groups can be controlled by digital
inputs, virtual inputs (communication, logic) and manually.
Parameters of the undirectional earth fault stage
I
0
> (50N/51N)
Current status of the stage
Digital signal to select the
active setting group
None
Digital input
Virtual input
LED indicator signal
Virtual output
Function key
Force flag for status forcing
for test purposes. This is a
common flag for all stages
and output relays, too.
Automatically reset by a 5-
minute timeout.
The supervised value
according the parameter
"Input" below.
Pick-up value scaled to
primary value
Pick-up setting relative to
the parameter "Input" and
the corresponding CT value
To Next Page
Loading...
