26
TGH1266E -
05/04
6 Points to be Considered before Use
+
-
DC
PE
PGH185
K1
Reduced
Measurement Current
The EDS3065 makes it possible to search for insulation faults in IT systems, AC 19.2 ... 575 V and
DC 19.2 ... 504 V. The system is particularly well suited for use in control voltage systems where
control errors may be caused as a result of high fault currents; this is due to the special features of
the EDS3065, such as:
•
low test current =>no control errors
•
high sensitivity
•
relatively insensitive to system leakage capacitances and faults
•
extended time measurement
•
data transmission with possibility of evaluation
Especially in DC control voltage systems in the power station and energy supply utility sector, relays
or SPCs may be installed which are already triggered by relatively low currents.
Caution
The sketch above shows a DC system. Relay K1 can be caused to operate by an insulation fault in
combination with the test cycle of the PGH185. In such a case, the I
max
switch on the PGH185
must be moved to the 10 mA position.
Also, when the EDS3065 is being used with the ‘test current limited to 10 mA’ feature activated,
it is necessary to check whether any sensitive system components might be caused to operate
unintentionally.
