Drop out fuse is a kind of short circuit protection switch widely used in branch lines of 10kV distribution lines and distribution transformers. What are its specific functions?

Function of drop out fuse:

The specific function of drop out fuse is to install it on the branch line of 10kV distribution line, which can reduce the scope of power failure. Because it has an obvious disconnection point, it has the function of disconnecting switch, creating a safe working environment for lines and equipment in the maintenance section, and increasing the safety sense of maintenance personnel. Installed on the distribution transformer, it can also be used as the main protection of the distribution transformer, so it is popular in 10kV distribution lines and distribution transformers.

Working principle of drop fuse:

The moving contacts at both ends of the fuse tube are fastened by the fuse (melt). After the upper moving contact is pushed into the protruding part of the "duck beak", the upper static contact made of phosphor copper sheet is against the upper moving contact, so the fuse tube is firmly stuck in the "duck beak". When the short circuit current is fused through the fuse, an arc is generated. The steel paper tube lined with the fuse tube generates a large amount of gas under the action of the arc. Because the upper end of the fuse tube is sealed, the gas is ejected to the lower end to blow out the arc. As the fuse is blown, the upper and lower moving contacts of the fuse tube lose the binding force of the fuse. Under the action of the gravity of the fuse tube itself and the spring sheets of the upper and lower stationary contacts, the fuse tube drops rapidly, breaking the circuit and cutting off the line or equipment in the fault section.