Micom P721, Technical Manual

Page: 63 / 334

User Guide P72x/EN FT/C21
MiCOM P721/P723 Page 23/38
PROTECTION G1
[87N] Flt Timer
t Diff
0s
The fault timer tDiff sets the time delayed earth
differential protection threshold. The setting range is
from 0s to 2s (step 10ms).
[87N] Rst Timer
tReset= 0s
The Reset timer menu sets the reset time, from 0 to
600s (step 10ms)
[87N] Measure
Filter Sample
The measurement filter is used to select sample mode,
fast sample mode or Fourier mode for threshold
detection.
Setting choice: sample mode, fast sample mode or
Fourier mode.
2.7.1.2
Submenu [95N] Earth bus-wire supervision
PROTECTION G1
[95N] Earth bus-wire
supervision
Heading of the earth high impedance differential current
buswire supervision submenu (“[87N] Earth diff
protection”).
[95N] Earth bus-wire
sup? No
Setting choice: Yes or No
Yes: the [95N] Earth high impedance differential buswire
supervision is enabled. The following menus are
displayed.
No: the [95N] Earth high impedance differential
protection is not enabled, and no menu is displayed.
[95N] Threshold
I Sup=
1 In
This menu is displayed when current input selection is
configured.
It sets the value for the earth current high impedance
differential threshold, from 0.01In up to 1In (step 0.01In)
[95N] Threshold
V Sup=
200.0V
This menu is displayed when voltage input selection is
configured.
it sets the value for the earth voltage high impedance
differential threshold, from 0.5V to 200V (step 0.1V)
[95N] Flt Timer
t Sup
0s
The fault timer tSup sets the time delay for the earth high
impedance differential threshold. The setting range is
from 0.5s to 3s (step 10ms).
[95N] Rst Timer
tReset= 0s
The Reset timer menu sets the reset time, from 0 to
600s (step 10ms)
[95N] Measure
Filter Sample
The measurement filter is used to select sample mode,
fast sample mode or Fourier mode for threshold
detection.
Setting choice: sample, fast sample or Fourier mode.