Medium and low voltage cable fault tester

According to the different test principles, the fault test of medium and low voltage cables can be divided into three types: first, the rough fault test is carried out by using the pulse reflection method test principle, and the fault location is carried out by using special high-voltage accessories, such as using a special high-voltage test power supply with a lower voltage level, using a large capacity pulse capacitor, etc., which is basically the same as the traditional cable fault tester; The second is to use step voltage testing method for fault testing; The third is to use the principle of bridge testing for testing. Most of the medium and low voltage cable detectors circulating in the market complete the function of rough detection of cable faults. The principle is generally to use the electric bridge method, but it has already adopted computer technology and uses an intelligent electric bridge. There are low-voltage bridges, high-voltage bridges, etc. Some instruments also use the principle of ultra-high voltage digital bridges. The voltage applied to the fault point is generally above 200V, with a maximum of 20KV. For cable faults with low fault resistance (resistance less than 600M Ω). The fault distance can be roughly measured with the medium and low voltage cable detector.
Application scope: Suitable for leakage fault testing with low fault resistance values. Generally used for cable fault testing below 6000V.
Advantages: For cable faults that are suitable for testing, its use is simple and the technical requirements for users are not high. That is, a "fool like" test. In addition, for some fault points, such as cable joint faults, due to the long creepage distance of the fault points, it is not possible to form a "flashover" discharge fault. Due to the inability to use pulse reflection method (flashover method) for rough measurement of fault distance, using the bridge method for testing has its advantages.
Disadvantages: It can only test the leakage fault of medium and low voltage cables, and cannot directly test most high resistance faults, flashover faults, broken wire faults, and faults that do not know the full length of the cable of high voltage cables.