30
TGH1266E - 05/04
Points to be Considered before Use
Kurve 3
0
20
40
60
80
100
120
0,1
0,3
0,5
0,7
1,5
2,5
4
6
8
10
x C
E
max
R
E
max
(%)
Curve 3
Curve 3: Reduction of response sensitivity when system leakage
capacitances are greater than the maximum permissible
value for C
E
taken from curves 2a and 2b.
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 transformer
must amount to at least 50% of the total capacitance. Otherwise, a reduction in
sensitivity must be expected.
The maximum system leakage capacitance is taken to be a value of 20000 µFV. In a 400 V system,
therefore, this is 20000 µFV/400 V = 50 µF. If the limit value is exceeded, there may be false alarms.
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