Electric power testing equipment has related operating methods, operating instrument based on the correct methods can ensure better test results. Let's take a look at the specific content of the operation method of the cable fault test system and the test steps of the cable fault test system.
Cable fault test steps
(1) When the cable fault test system determines the cable fault, the tester must first determine the nature of the cable fault in addition to mastering the performance and operating methods of the machine, so that appropriate working methods and testing methods can be adopted. First use a megohmmeter or a multimeter to measure the insulation resistance between each phase and each phase at one end of the cable, and determine whether it is a low-resistance short circuit or a disconnected open circuit, or a high-resistance flashover fault according to the resistance value.
(2) When the resistance of the cable fault test system is lower than 100 ohms, it is a low-resistance fault, 0 to dozens of ohms is a short-circuit fault, and the resistance is extremely high to infinitely large as an open circuit or disconnection fault. Whether the wire is broken or not, you can also connect the cable terminal to a universal meter to measure the resistance of the two phases that are short-circuited at the beginning to confirm. This type of fault can be directly measured by the low-pulse method.
Cable fault test system
(3) When the resistance is very high (hundreds of megabytes and gigabytes) and there is instantaneous discharge during high-voltage tests, such failures are generally called flashover failures, which can be determined by the DC high-voltage flash test method of the cable failure test system .
(4) The resistance value of high-resistance faults is higher than that of low-resistance faults, which can be determined by the DC high-voltage flash test method during the high-voltage experiment of the cable fault test system.
(5) The cable fault test system will conduct a rough test in a certain way before determining the points. If necessary, find the cable path to measure the cable length or distance.