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5.20 Setting 11
th
Harmonic Threshold
Setting of the limiting value for the 11
th
harmonic.
5.21 Setting 13
th
Harmonic Threshold
Setting of the limiting value for the 13
th
harmonic.
5.22 Harmonic Over-Current Alarm
Signal
The Control Relay RM 9606 is able to
determine the ratio between the actually
measured RMS current and the nominal
current (50 - 60 Hz) of the capacitor.If this
ratio is exceeded by the factor set for at
least one minute due to harmonics and the
resulting resonance phenomenon, the
control relay switches off all stages which
have been switched on. At the same time
an alarm is signalised. After approximately
four minutes the required capacitor stages
are switched on again. By pressing the
"Set" button the peak value is displayed.
Notice:
When exclusively filtered stages are
being used, set this threshold to the
highest possible value (in order to in-
activate it).
5.23 Suppressing the Power Factor
Alarm
As already described the control relay tries
to reach its programmed control band. If
this, however, is not possible due to lack
of capacitor stages available, an alarm is
signalised after several minutes (depend-
ing on the size of the difference). In case
of a capacitive cos-phi outside the band
range the alarm signal functions as well.
When setting "OFF" the alarm is sup-
pressed.
5.24 Total kvar Display
Provided the current transformer ratio has
been entered, the total kvar detected at
measured voltage will appear on the
display, when "Set" is pressed in Mode
-24-.
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