Technical data IRDH575
108
IRDH575_D00089_05_M_XXEN/01.2020
Curve 6:
When the system leakage capacitances are greater than the maximum per-
missible value for C
e
, as shown in curve 5, the response sensitivity decreases.
The indication of the test current on the IRDH575 display in case of high sys-
tem leakage capacitance also changes.
When considering the curves, a point to be taken into account is that the sum
of the pre-capacitances upstream of the individual measuring current trans-
former must amount to at least 50 % of the maximum total capacitance.
Otherwise, it may result in wrong alarm messages.
A value of 300 µFV/230 V = 1.3 µF is taken to be the maximum system leakage
capacitance value. When the limiting value is exceeded, false tripping may
occur.
0
20
40
60
80
100
120
0 0,5 1 1,5 2 2,5 3 3,5
x C
e
max [P F]
R
F
max [%]
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