Megger Limited PWS / Nov 06
DET4TC/R Launch
21
We all like “ART” but sometimes it’s misunderstood
Like most modern and new forms of ART sometimes it’s misunderstood, but
hopefully we can prevent that happening to you.
Lets look at the following diagram and see if we can spot the error?
The error isn’t at first obvious, I want to measure the earth resistance of the guy line
with the clamp around it. But the guy lines on this tower are all shorted together. The
current being measured by ICLAMP is flowing not just to ground at the anchor point,
but back up the other guy lines and to ground via the tower. This means the
calculated resistance will be incorrect for the anchor point.
Always consider where the test current is going to flow, all measured test current
should flow through the required earth (soil) mass around the electrode under test.
Current C
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