General requirements for purchasing cable fault testing instruments

Choosing a type of cable fault tester depends first on the specific requirements of the user and whether there are any special requirements for the instrument. Generally speaking, if the same kind of instrument has not been purchased and used before, the cable types are both high voltage cables and low voltage cables, the cable laying methods are direct burial, cable trench, overhead, etc., and there are no special requirements for the instrument. It is recommended to select a cable fault tester with three complete functions, namely, rough fault distance measurement, cable path detection, and accurate fault location. The specific requirements are: the fault point rough tester (flash tester) has the function of testing cable length with low voltage pulse and testing high resistance faults with flash method; The fault locator has a fixed point function for acoustic testing, preferably with a fixed point function for acoustic magnetic synchronous testing; The path tester should be able to test the path of cables buried directly at a depth of 2 meters, with a testing distance of at least 5 kilometers.
For users who have already purchased and used the above intelligent cable fault tester, when purchasing again, they can purchase similar instruments with improved functions, so that they can use them more proficiently. You can also purchase testing instruments based on other testing principles according to the specific situation of the unit. For example, if there are many cables laid in the cable trench, you can purchase a high-voltage intelligent bridge testing instrument. After testing the fault distance, you can directly open the cable trench to find the open type cable fault points with armor damage. If there are many directly buried cables and the cables are relatively new, a tester using the step voltage testing principle can be purchased. If funds permit, different types of testers can be purchased and flexibly used according to on-site conditions.
For users with a simple scope of use, such as the street lamp management department, they can purchase the street lamp cable tester. However, it should be noted that the purchased instrument should have the pulse method test and the bridge method test functions, and the fault location should also have the step voltage method and the acoustic method to complete most of the street lamp fault point Test effort.
For faults where the cable core wire is broken and the outer sheath (sheath) of the cable wire is not damaged, it is not possible to use the bridge method to test the fault distance, nor can the step voltage method be used to accurately determine the location; For cables with multiple damaged outer sheaths, even if the cable is directly buried and has a ground fault, the step voltage method cannot be used to fix the point.