System description
19
TGH1394en/05.2007
Fault curve
Safe fault location is possible in the grey-shaded area.
If insulation fault location is not possible on a measuring channel, the
EDS issues the message "peak".
Symmetrical insulation faults downstream of the meas-
uring current transformer are not recognized under cer-
tain circumstances.
Low-frequency residual currents (caused by converters,
for example) may have the effect that insulation faults
cannot be found when their frequency is equal or nearly
equal the text cycle frequency of the IRDH575 respective-
ly. PGH... .
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