Considerations prior to use
21
EDS309x_D00012_03_M_XXEN/11.2014
Abb. 4.3: Fault curve:
A residual current of 2 A at 10 Hz is outside the permitted
frequency range (red dot) ==> a valid measurement is not possible!
There must be no connections between outgoing circuits downstream of the
measuring clamp because such connections will produce interfering residual
currents. For example, the message "IΔn>10A" may be output as a consequence.
Symmetrical insulation faults downstream of the measuring current transform-
er will not be detected in certain circumstances. Low frequency residual currents
(e.g. caused by converters) can mean that insulation faults are not found if their
frequency is the same as or approximately the same as the frequency of the lo-
cating cycle of the PGH18….
Parallel cables routed to the same load are to be routed together through the
measuring clamp during the measurement.
0
1
2
3
4
5
6
7
8
9
10
110100
Permissible residual current [A]
Frequency [Hz]
Frequency range Insulaon fault locaon EDS195P
EDS3090..., EDS3096...
EDS3091...
1
0,9
0,8
0,7
0,6
0,5
0,4
0,3
0,2
0,1
Permissible
Frequency and
Residual current range
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