Instruction manual
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AQ F3x0 Feeder protection IED
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Parameter
Setting value, range
and step
Description
Operation
Off
Peak value
Fundamental value
Operating mode selection of the function. Can be disabled,
operating based into measured current peak values or operating
based into calculated current fundamental frequency RMS
values. Default settin
g is “Peak value”
Start
current
20
…3000 %, by step
of 1%
Pick-up setting of the function. Setting range is from 20% to
3000% of the configured nominal secondary current. Setting
step is 1 %. Default setting is 200 %
3.2.2
R
ESIDUAL INSTANTANEOUS OVERCURRENT
I0>>>
(50N)
The residual instantaneous overcurrent protection function operates according to
instantaneous characteristics, using the residual current (IN=3Io). The setting value is a
parameter, and it can be doubled with dedicated input binary signal. The basic calculation
can be based on peak value selection or on Fourier basic harmonic calculation, according
to the parameter setting.
Figure 10: Operating characteristics of the residual instantaneous overcurrent protection
function.
tOP (seconds)
Theoretical operating time if G> GS (without additional time delay),
G
Measured peak value or Fourier base harmonic of the residual current
