The fuse cutout and the load break fuse cutout are outdoor high-voltage protection electrical appliances.
It is installed on the high-voltage side of the distribution transformer or on the branch trunk line of the distribution line, and is used for short-circuit protection of the transformer and the line, overload protection and switching load current. The fuse cutout is composed of two parts: an insulating bracket and a fuse tube, and a static contact Installed at both ends of the insulating support, and the movable contacts are installed at both ends of the fuse tube. The fuse tube is composed of an arc suppression tube and an epoxy glass tube.
Load drop fuse adds elastic auxiliary contact and arc extinguishing cover to switch load current.
When the fuse cutout is in normal operation, the fuse tube is tightened by the fuse to form a closed position.
When the system fails, the fault current quickly blows the fuse and forms an arc. The arc extinguishing tube is heated by the arc and decomposes a large amount of gas, causing a high pressure in the tube to form a vertical blow along the way, and the arc is rapidly elongated. And goes out.
After the fuse is blown, the lower movable contact loses its tension and turns down, the locking mechanism releases the fuse tube, and the fuse tube falls, forming an obvious breaking position.
When the load needs to be pulled, use the insulating rod to pull the movable contact to separate the contacts, and an arc is generated between the auxiliary contacts. At zero time, the arc is extinguished.
Post time: Dec-23-2021