Finding the location of an underground cable fault doesn t have to be like finding a needle in a haystack.
Power cable fault finder.
Cable fault on two cables.
Cable fault finding guide.
Loop tests for locating faults in underground cables edit in addition to pulse reflection method and transient method there are two popular loop tests for finding the location of faults in underground cables.
Loop tests to finding cable faults.
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Two of the popular techniques are the murray and varley loop tests for locating faults in underground cables this article explains about few other popular techniques for locating faults in underground cables viz.
Cable faults can be easily located if a sound cable runs along with the grounded cables.
There are many locating methods coupled with new detection technologies that make this task much easier and less time consuming.
A common approach to test cable and determine insulation integrity is to use a hi pot test in a hi pot test a dc voltage is applied for 5 to 15 min.
In cable identification the faulty cables are identified from the fault free cables at the already determined site.
Ieee 400 speciļ¬es that the hi pot voltage for a 15 kv class cable is 56 kv for an acceptance test and 46 kv for a maintenance test ansi ieee std.
It is a complete tool for ac testing and fault locating cables rated up to 25 kv and is tdr radar ready.
Following are the types of loop tests.
These kinds of tests are carried out on short circuit faults or earth fault in underground cables.
However you should understand that there is no single method or combination of methods that is best.
But finding the exact location of the cable fault needs special techniques.
Other industry standard tests are given in aeic cs5 94.
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