Underground Cable Fault Detection Method

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.

Underground cable fault detection method.

Finding the type of a fault in underground cables using a megger should not be a difficult task. But finding the exact location of the cable fault needs special techniques. In order to identify the faults in the cable we need to develop special methods which will be discussed in this article. Cable detection or fault finding can be done via two methods.

Surge generator generates d c. Before we discuss fault detection methods we shall study the various types of faults occurring in underground cables and their causes. This project uses the ohms law concept when a low voltage dc is applied to the feeder end through a series resistor then the current would differ based on the location of fault occurred in the cable in case is there any short circuit occurred from line to ground then the voltage across series resistor alters accordingly then it is fed to an. The surges produced help in pinpointing the fault and tracing the route of the cable when used with acoustic fault locator.

There are many locating methods coupled with new detection technologies that make this task much easier and less time consuming. 1000 joules energy on 5 10 20 kv range. Finding the location of an underground cable fault doesn t have to be like finding a needle in a haystack. Underground cable fault distance locator circuit.

Here the electromagnetic field already present on the utility is detected with the help of a receiver or detector.