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EDS309x_D00012_03_M_XXEN/11.2014
4. Considerations prior to use
4.1 How does the equipment for insulation fault location work
The equipment comprises a locating current injector PGH18… and an insulation fault locator
EDS195P with measuring clamp PSA3… connected.
Functional sequence
Insulation fault location is started by activating the locating current injector PGH18…
The locating current injector PGH18… briefly connects the live conductors to earth with cur-
rent limiting.
The insulation fault creates a closed circuit in which a locating current
I
L
dependent on the sys-
tem voltage flows. The locating current is limited to a maximum value of 25 mA or 10 mA
(PGH185/186), 2.5 mA or 1 mA (PGH183).
The locating current flows from the locating current injector via the live cables, the insulation
fault
R
F
and the earth cable (PE cable) back to the locating current injector.
The locating current signal can be measured using measuring clamp placed around the cables
in the outgoing circuit from the distribution system and evaluated by the insulation fault loca-
tor EDS195P.
The location of the fault can be determined exactly by moving along the cable with the measur-
ing clamp.
Abb. 4.1: EDS operating principle
PGH18...
EDS195P
PSA...
I
L
Summary of Contents for EDS3090
Page 6: ...Table of Contents 6 EDS309x_D00012_03_M_XXEN 11 2014...
Page 26: ...Considerations prior to use 26 EDS309x_D00012_03_M_XXEN 11 2014...
Page 62: ...Frequently Asked Questions 62 EDS309x_D00012_03_M_XXEN 11 2014...
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