Micom P721, Техническое руководство

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P72x/EN FT/C21 User Guide
Page 20/38 MiCOM P721/P723
2.5 MEASUREMENTS Menu
Under the MEASUREMENTS menu, the user can read the various measurement values.
To access the MEASUREMENTS menu from the default display, press then 2 times.
MEASUREMENTS
Heading of the MEASUREMENTS menu.
2.5.1
If Earth protection is selected
INdiff=
0.00A
Displays the average earth differential current value C (True
RMS value):
Frequency
9.99Hz
Displays the network frequency calculated from phase
currents.
Max & Average I
RST = [C]
Allows the user to clear the maximum (peak) and average
(rolling) memorised values of the current.
Press
to clear these values (password required).
Indiff Maximum
0.00A
Displays the maximum earth differential current value (True
RMS value).
2.5.2
If Phase protection is selected (P723 only)
Idiff= 0.00A
0.00A 0.00A
Displays the differential current values for phases A, B and C
(or L1, L2, L3, or R, S, T) (True RMS value) as follows:
Phase A
Phase B Phase C
Frequency
9.99Hz
Displays the network frequency calculated from earth
currents
Max & Average I
RST = [C]
Allows the user to clear the maximum (peak) and average
(rolling) memorised values of the current.
Press
to clear these values (password required).
Idiff M 0.00A
0.00A 0.00A
Displays the peak differential current value for phases A, B
and C.
This value is the True RMS maximum value.