Differential Impulse Current Method (Diff ICM)

1. BAUR Prüf- und Messtechnik GmbH · Raiffeisenstrasse 8 · A-6832 Sulz/Austria · T. +43/5522/4941-0 · F +43/5522/4941-3 · headoffice@baur.at · www.baur.at
Differential Impulse Current Method (Diff ICM)
Differential Decay Method (Diff Decay)
Explanation:
The Differential Impulse Current Method and the Differential Decay Method is based
on the current impulse pick up via an inductive coupling unit. For the differential
Decay method, the faulty cable is charged by applied DC voltage up to the level of
the breakdown, whereas for the differential Impulse current method a surge energy
impulse is used. This breakdown causes a transient wave which is travelling
between the faulty point and the system. This transient wave will be recorded by the
echometer IRG 2000/3000 via the inductive coupling unit.
The Differential Impulse Current Method and the Differential Decay Method is
working with two separate measurements (one without bypass bridge and second
one with a bypass bridge at the far end).
At the splitting point of these two lines, the faulty position is indicated.
The information of the distance to the faulty position is from the far end!
Block diagram:
Bypass Bridge
fautly cable
DVR: 0438146 · FN 77324m · Landesgericht Feldkirch 1

2. BAUR Prüf- und Messtechnik GmbH · Raiffeisenstrasse 8 · A-6832 Sulz/Austria · T. +43/5522/4941-0 · F +43/5522/4941-3 · headoffice@baur.at · www.baur.at
Measurement example:
First measurement
without bypass bridge at
the far end
Second measurement
with bypass bridge at the
far end
faulty position,
splitting of the lines
DVR: 0438146 · FN 77324m · Landesgericht Feldkirch 2