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ESG NT Sheath Fault Pinpointer (SebaKMT)
ESG NT Sheath Fault Pinpointer (SebaKMT)
The pinpointing procedure
Pinpointing means the precise location of faults in the cable
sheath. These faults cause the measuring current to fl ow into
the ground. When it exits the cable at the fault point, the
measuring current builds a voltage gradient which can be
measured by earth rods and earth fault locators. The accurate
location of sheath faults is done by the step voltage method:
as it approaches the fault point, the step voltage potential
increases, decreasing with reversed polarity after it passes
the fault. The change in polarity allows the fault to be located
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