The test steps are divided into these major steps:
First, we need to analyze the nature of the cable fault and understand the type of faulty cable.
Different types of cable faults often have different test methods. And we can choose different test speeds according to the cable types of different media. It is also necessary to test according to the withstand voltage level of the cable and the withstand voltage requirements of the cable. It is also necessary to pay attention to the joint position of the tested cable and whether it has been constructed above the cable. The above problems are all the problems that need to be understood in order to test the cable again.
Secondly, we need to know the length of the cable by using the low-voltage pulse method of the host to check the transmission speed of the cable.
When we know how long the cable is, we can better understand the specific situation of the faulty cable, and can further judge whether it is a high-resistance or low-resistance fault, and can also judge whether the inherent wave speed is accurate. (Accurate radio wave transmission speed is the guarantee to improve the test accuracy; when the speed is inaccurate, the speed can be calculated back. The above problems can be tested by the low-voltage pulse test method.
Then, use the path meter to detect the direction of the buried cable.
Before locating the cable fault, the path of the cable must be known. We can use the cable path tester to test, but if the cable path is already known, there is no need to test the cable path.
Once again, use the cable fault locator to precisely locate the fault point.
First, wire the high-voltage equipment according to the fixed-point discharge method, and then determine the degree of boosting according to the nature of the cable and the withstand voltage level of the cable. Finally, make precise measurements of the cable fault point. If the fault point is very close to the test end, especially when the tester locates the test end of the cable, the sound of the ball gap discharge will be louder than that of the fault point, and it will be difficult to distinguish the sound of the fault point. In this case, the tester can move the high-voltage equipment to the other end to locate the cable fault.
Finally, at the end of the test, the tester needs to analyze the error of the cable fault test results and record the test results.