Megger SG32-1500M, User Manual

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Typical Fault Locating Strategy
SG32-UG-EN-V01 Dec 2016
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Description of ICE / Impulse Current
ICE or Impulse current is probably one of the oldest methods of fault Pre-
location using “transient analysis”. This method allows the pre-location of high
resistance and flashing faults, with the advantage of the HV pulse being effected
by any type of filter (100% surge energy), but the disadvantage of not seeing the
start and the end of the cable.
In Impulse Current we use an Impulse Generator, Inductive Coupler (C.T.) and
the MTDR100 which acts like a transient recorder. The surge generator creates a
flashover at the point of fault and the resultant transients are reflected back and
forward between the fault and the impulse generator. These transients are
picked-up by the Inductive couple and fed to the MTDR where they are
subsequently displayed.
Typical Trace
Di
Ionisation
time
SG32
Surge
Generator
Thumper