Locating That Underground Cable Fault


There are hundreds of cables buried beneath the ground. A repair on one of those buried lines used to be like finding a needle in a haystack, but not anymore. Cable faults can now be spotted very easily using modern detection technologies. Cable locators and detection technologies make the task less time-consuming and much easier than before.

When locating cable faults, one must have a certain set of skills necessary to do the job without damaging the cables. There are several methods in cable fault finding. You can sectionalize the cable or divide it into small cables and test it. Thumping (inducing a high voltage current to the cable) will cause the faulty part of the grid to make a loud noise. However this may cause degradation on the rubber insulations. Time Domain Reflectometry (TDR), sends a low-energy signal that causes no damage to the insulations but the results are not completely reliable. However the result can be used to decide whether thumping is needed in the area.

Other methods include High-voltage radar method, the surge pulse reflection method and the voltage pulse reflection method. Faulted cables produce electrical disturbances and these disturbances can be detected through these methods. Click here for the full article…

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