Drop-out fuses and pull-load drop-out fuses are outdoor high-voltage protective appliances. It is installed on the high-voltage side of the distribution transformer or on the branch line of the distribution line, and is used for short-circuit, overload protection, and split and combined load current of transformers and lines. The drop fuse is composed of an insulating support and a fuse tube. The static contact is installed at both ends of the insulating support, and the moving contact is installed at both ends of the fuse tube. The fuse tube consists of the inner arc extinguishing tube and the outer layer. It consists of phenolic paper tube or epoxy glass cloth tube. Pull-load drop-out fuse enhances the elastic auxiliary contact and arc extinguishing cover to divide and combine the load current.
In the normal operation of the drop-out fuse, the fuse tube is tensioned by the fuse to form a closed position. When the system fails, the fuse is quickly blown out when the fault current occurs, and an arc is formed. The arc extinguishing tube is heated by the arc and decomposes a large amount of gas, which causes a high pressure in the hall and a vertical blow along the pipeline. The arc is quickly stretched. And goes out. After the fuse is blown, the lower moving contact loses its tension and turns over twice. The machine is locked, the fuse tube is released, and the fuse tube is dropped, forming an obvious breaking position. When the load needs to be pulled, use the insulation rod to pull the contact. At this time, the active and static contact are still in contact. If you continue to use the insulation rod to pull the contact, the auxiliary contact is also separated, and an arc occurs between the auxiliary contacts. It is stretched in the extinguishing slit, and at the same time, the extinguishing hood generates gas, and when the current crosses zero, the arc is extinguished.
|model||Rated voltage Kv||Rated current A||Breaking current A||Surge voltage BIL||Power frequency withstand voltage Kv||Climbing distance mm||Weight kg||Packing size assembly cm|
|HPRWG1-12F||12||100||6300||125||45||380||5||55 × 41.5 × 14.5|