Disconnecting Switch

Overview of drop fuse
The utility model relates to an outdoor drop type fuse which is suitable for 35kV and below voltage frequency 50Hz power system, and is used for the protection of the transmission line and the overload and short circuit of the power transformer. The utility model has the advantages of economy, convenient operation and strong adaptability to outdoor environment.
Working principle of drop fuse
Fuse in series with the electrical circuit, in normal operation, the fuse with buttons arranged on the contact fuse tube, is equipped with pressure release cap pressing tablet, fuse tail line through the fuse tube is pulled out, will pop up in anti torsion pressure near the nozzle, connected with the lower contact, in the pop-up plate under the action of torsion the fuse has been in a state of tension, and lock joint. When the fuse is in the closing position, the contact of the whole fuse is more reliable because of the downward contact of the upper static contact and the shrapnel.
When a fault occurs in power system, the fault current will quickly fuse fuse, to generate electric arc melting tube, the fuse tube produces a large amount of gas in the arc effect, when the gas exceeds a given pressure value, release tablet with the button head open, reducing the pressure inside the fuse tube, have a strong go free at current zero, the arc is extinguished. And when the gas does not exceed a given pressure value, the release tablet does not act, the current generated by the time of the strong free gas emitted from the lower nozzle, the pop-up plate will quickly pull out the fuse wire, so that the arc extinguished. When the fuse is fused, the movable joint is released, and the fuse tube falls under the pressure of the lower elastic piece under the upper static contact, and the function of the self weight is dropped rapidly, and the circuit is cut off to form a clear break gap.