Data
76
EDS460-490_D00085_01_M_XXEN/02.2016
The following characteristics are an easy way of determining a suitable res-
ponse value for the insulation monitoring device and the EDS… . Proceed as
follows:
1. Select the characteristics (3 AC, AC, DC) that are appropriate for your
type of distribution system.
2. From these, select the diagram that best matches the desired system
voltage.
3. Calculate the anticipated leakage capacitance of the system being
monitored. The IRDH575 displays the system leakage capacitance
(press the INFO button). Apply this value to the diagram in the form of
a vertical line.
4. The characteristics provided indicate the EDS system's response sensi-
tivity when the EDS response value is set to 2 mA, 5 mA and 10 mA.
Values above the relevant curve cannot be detected.
5. Select the middle characteristic for an EDS… response value of 5 mA
(factory setting). Mark the system leakage capacitance C
e
on the cha-
racteristic. Read off the relevant resistance R
e
from the characteristic.
The resistance R
e
thus calculated indicates the maximum response
value that can be set on the insulation monitoring device (e.g.
IRDH575). If higher response values than this are set, insulation fault
detection becomes unreliable. A reliable response on the part of the
insulation monitoring device must be ensured before the EDS system
can be started.
6. If you wish to set a higher or lower response value for the insulation
monitoring device, you will need to calculate the resistance (R
e
) for the
top and bottom characteristics as described under point 5. Values and
characteristics that fall between the top and bottom characteristics can
be roughly determined on the basis of those actually provided.
7. Set the calculated response values on the insulation monitoring device
and the EDS… .
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