How should we choose DC test or AC test for cable fault testing?

Cable fault testing is an important power detection technology that can detect the location and type of cable faults through testing. In cable fault testing, DC test and AC test are two commonly used test methods. So, how should we choose between DC test or AC test when conducting cable fault testing?

1、 DC test

DC test is to pass DC current through the cable and determine the fault location and type of the cable by measuring its voltage and current. The advantage of DC testing is that it can measure the insulation and conductivity performance of cables, and can detect short circuit and open circuit faults of cables. Meanwhile, the testing equipment for DC testing is simple, easy to operate, and has a lower cost. However, there are also some drawbacks to DC testing. Firstly, the test voltage for DC testing is relatively high, which can easily cause damage to cables, especially for old cables and cables with poor insulation. Secondly, the fault location accuracy of DC testing is relatively low, as DC testing can only detect the type of cable fault and cannot determine the fault location.

2、 AC test

AC test is the process of passing AC current through a cable and determining the location and type of cable faults by measuring the voltage and current of the cable. The advantage of AC testing is that it can measure the insulation and conductivity performance of cables, and can detect short circuit and open circuit faults of cables. At the same time, the test voltage of the AC test is relatively low, and the damage to the cable is relatively small, especially for old cables and cables with poor insulation layer. However, there are also some drawbacks to communication experiments. Firstly, the experimental equipment for communication experiments is complex, difficult to operate, and costly. Secondly, the fault location accuracy of communication experiments is relatively high, but complex fault location instruments and technologies are required.

Both DC test and AC test have their advantages and disadvantages, and they need to be selected based on the specific cable fault testing situation. When selecting testing methods, comprehensive consideration should be given to factors such as cable fault type, insulation performance, conductivity, testing equipment, and cost. At the same time, when conducting cable fault testing, safety operating procedures should be followed, safety protective equipment should be worn to ensure the safety of testing personnel and equipment.

ZC-700D power cable fault rangefinder is used for distance measurement of power cable fault points. It has the characteristics of easy waveform recognition, high resolution, user-friendly interface, support for both touch and mechanical buttons, and easy operation.

Can be used independently in low-voltage pulse mode; In pulse current mode, it needs to be used in conjunction with a high-voltage signal generator; In the multiple pulse mode, it is also necessary to cooperate with the cable testing multiple pulse coupler; After the distance measurement is completed, a digital multifunctional cable fault locator must be used for precise positioning. They together form a high-performance cable fault finding system that can provide multiple innovative features.

Kvtester Electronics Technology Co.,Ltd. is a high-tech enterprise specializing in power testing, testing, research and development, production, and sales of testing equipment. It has been engaged in the electrical testing industry for many years, and its products are of high quality. We welcome customers to come and purchase. Service hotline: 0086-27-81778799, to learn more, visit the official website: www.kvtester.com