Underground Cable Fault Finding

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Underground cable fault finding.

We ve assembled helpful technical guides on cable testing and cable fault location from leading manufacturers in the field if you are looking for something specific don t hesitate to contact us. Open circuit fault as the name suggests this fault involves an open circuit in the conductors. Other industry standard tests are given in aeic cs5 94. Cable fault on two cables.

Before attempting to locate underground cable faults on direct buried primary cable it is necessary to know where the cable is located and what route it takes. Following are the types of loop tests. Loop tests to finding cable faults. This discontinuity also occurs when the cable comes out of its joint due to mechanical stress.

Route tracing is used to determine where the faulty cable lies and pinpointing is the process of determining the exact position of the cable fault. But finding the exact location of the cable fault needs special techniques. These kinds of tests are carried out on short circuit faults or earth fault in underground cables. 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. Finding the location of an underground cable fault doesn t have to be like finding a needle in a haystack. When one or more cable conductors cores break it leads to discontinuity. In cable identification the faulty cables are identified from the fault free cables at the already determined site.

For further resources why not check out our video support library and our electrical testing electrical safety blog. There are many locating methods coupled with new detection technologies that make this task much easier and less time consuming. Ieee 400 specifies 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. Cable fault finding guide.

Fault locators are essential tools for personnel who install and repair underground electrical and communications cable. However you should understand that there is no single method or combination of methods that is best. Correctly used ground fault locator and cable fault locator equipment can accurately identify the location and depth of underground cable even when it is inside conduit and can pinpoint breaks or faults in underground cable. Finding the type of a fault in underground cables using a megger should not be a difficult task.

Loop tests for locating faults in underground cables. If the fault is on secondary cable knowing the exact route is even more critical.