HT 2016 - Digital jordmodstandsmĺling. - Elma Instruments
HT 2016 - Digital jordmodstandsmĺling. - Elma Instruments
HT 2016 - Digital jordmodstandsmĺling. - Elma Instruments
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For big earth plant<br />
Geotest <strong>2016</strong><br />
Version EN 1.01 of 19/10/2000<br />
Also this procedure is based on the voltamperometric method, but it’s mainly used when<br />
it’s difficult to position the auxiliary current rod at a distance corresponding to fivefold the<br />
diagonal of the area of the earth equipment. Position the current probe at a distance equal<br />
to the diagonal of the area of the earth equipment (see ). To make sure that the voltage<br />
probe is positioned outside the area affected by the rod under test, take more<br />
measurements, first positioning the voltage probe at half-way between the rod and the<br />
current probe, then moving the probe both towards the earth rod and towards the current<br />
probe.<br />
Use several rods in parallel and<br />
moisten the surrounding ground if<br />
the instrument does not manage<br />
to supply the current necessary to<br />
perform the test because of an<br />
high earth resistance.<br />
Re d<br />
Green<br />
Bla c k<br />
Blue<br />
picture 7:<br />
earth resistance measurement (voltamperometric method for big earth<br />
plant)<br />
EN - 37
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