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How to locate faults in underground cables?

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تم إضافة السؤال من قبل Muhammad Usman , Assistant Manager Operations , Lahore Electric Supply Company
تاريخ النشر: 2017/08/29
Karam Soliman
من قبل Karam Soliman , Electrical Project Manager , Power System and Information Tech.

First you need to secify the faulted phase using DC Hipot or better using VLF tester.

Second , you use one of two techniques : Bridge technique or the best one TDR Time Domain Reflectrometry .

 

In the last technique a pulse with a predetermined duration and speed are sent through the cable , at the point of fault a change in impedance occurs and the pulse is reflected showing the distance on the screen.

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