The difficulty of locating faults in control cables

Due to the variability of the cable laying environment,  the use of new type cables and their accessories in cable lines. 

The cable on-site fault location is becoming more difficult, such as armored control cable,7x1.5mm2 control cable, and underground electric copper power cable.

The difficulty of on-site cable fault location is highlighted by the fault location of the cable line. It is not as overhead lines(AAAC, AAC, ACSR). overhead cable lines are aerial, which is bare. 

At present, there are related literature and advanced fault detectors for high-impedance faults in cable lines. However, when using the professional cable fault locator for positioning the on-site, sometimes there are some special troubles that cannot be located.

For common cable faults, the use of commercially available cable fault locators typically determines the point of failure within minutes or hours. 

However, when special trouble occurs and the detection is not smooth, it may be necessary to call a plurality of cable fault detectors with different functions to repeat the test, and the rotation detection and alignment are confirmed. 

The types of these faulty instruments mainly include various cable fault detectors designed and manufactured according to the bridge method and the wave method principle, so that positioning may take several days or even longer, so when luck is good, it can be determined. 

At the point of the fault point, when the luck is not good, the position of the fault point is still undetermined.

In the northern part of China, the ground is frozen in winter. When the cable is directly buried, the actual fault detection and processing process is actually a very difficult task. 

First of all, the cable fault location instrument must have high precision. 

Secondly, there must be corresponding personnel who know the actual route of the cable. 

Although some cable fault detection instruments are equipped with cable path testers, they must also have the accuracy of the positioning can be improved by matching the on-site personnel who know the approximate laying route of the cable.