全讯新2红足(中国)有限公司

Since people began to discover the use of electricity, wires and cables have become the main carriers of power transmission. Wire and cable are indispensable in all aspects of electrical equipment, lighting circuits and household appliances. Although it is only a supporting industry, it occupies more than half of the electrical industry. The quality of wires and cables will directly affect the quality of the project and the safety of people, and will also affect the development prospects of the cable.

In the course of operation of wires and cables, accidents such as these often occur, especially when non-standard wire and cable are used. When the cable is in operation, when two-phase (and multi-phase) grounding or phase-to-phase short-circuit fault occurs, most of the system trips. This kind of fault phenomenon is commonly known as shooting. Let's talk about the main factors that cause "cable shooting".

1. The short-circuit fault between the three-phase core wires inside the cable, or one of the short-circuit faults with respect to the cable sheath, will generate a very large amount of heat, causing the fault to burst.

2. For example, particles, impurities, bubbles, etc. in the insulating layer, or external mechanical damage.

3. Check if the cable is bent too much to injure the cable.

4. The bending radius is too small, the mechanical external force is damaged, the DC resistance test ion release is not completed, and the rated current is overloaded.

Cable firing occurs during operation and can cause a sudden trip of the system, which is extremely detrimental to production. We believe that if the cable system often fails to shoot, it indicates that there are major problems in the construction, operation, maintenance and management of the cable line. It should be given enough attention. After the repair work is completed, the cause should be carefully found and eliminated. Avoid re-shooting accidents.