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NGRM700_D00292_00_Q_XXEN/09.2017
6. Shutdown signal RMS, fundamental frequency, harmonics
What threshold violations should trigger the trip relay?
A trip signal can be:
RMS
: The r.m.s. value of
I
or
U
over the entire frequency range (up to approx. 3.8 kHz).
Fundamental frequency
: Only the r.m.s. component of the fundamental frequency (50 or 60 Hz).
Harmonics
The filtered r.m.s. value on the set harmonics
H0 = DC
H1 = fundamental frequency
H2 = 2 x fundamental frequency
…
H32 = 32 x fundamental frequency
7. Initial measurement
During device start all measured values are recorded.
In the "Harmonics" measured value display (menu 2) all spectral lines are always
displayed. This is independent of the trip signal setting.
On the standard display, the trip signal is indicated as
resistance in Ω or %
current in A or %
Setting is entered in the main menu > 5: Display.
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