After the occurrence of the cable, we should first use simple tools to effectively judge the type and phase of the fault. Correct judgment of the nature of the cable fault can improve the working efficiency of 80% for rapid handling of the cable fault. It can be seen that the accurate judgment of the faulty cable is of great significance. I will solve the doubts of the majority of customers. Now let's talk about how to correctly and accurately judge the nature of the fault.
The method of determining the nature of cable fault The method of determining the nature of cable fault can be carried out by using a multimeter or insulation resistance tester, and the resistance between three phases to ground and between phases can be measured by using a 500V or 1000V insulation resistance tester. The specific steps are as follows:
(01) Use an insulation resistance tester to measure the resistance value of each phase. If one group of insulation resistance values measured is zero or low, use a multimeter to retest. The purpose of the retest is to determine whether it is a high resistance fault or a low resistance fault.
(02) Measure the insulation resistance between the two items. If the measured insulation resistance is zero or lower, it indicates that one of the phases has insulation fault, and then use a multimeter to eliminate the fault type of the faulty phase and the faulty cable, so as to take targeted search methods.
(03) Short-circuit the cable end and measure the DC resistance of the wire core. The DC resistance can also be used to determine which phase has the open circuit fault.