Introduction To The Use And Maintenance Of High-voltage Drop-out Fuses
drop out fuse Use and Maintenance Introduction
11 kv drop out fuse is a commonly used short-circuit maintenance switch for 10kV distribution line branches and distribution transformers. It is economical, easy to operate, and highly adaptable to outdoor environments. It is widely used on the primary side of 10kV distribution lines and distribution transformers for maintenance and equipment switching operations. It is installed on the 10kV distribution line branch line to reduce the scale of power outages. Because it has a significant disconnection point, it has the function of an isolation switch, creating a safe working environment for the maintenance section line and equipment, and increasing the sense of security of maintenance personnel. Installed on the distribution transformer, it can be used as the main maintenance of the distribution transformer, so it has been popularized in 10kV distribution lines and distribution transformers.
The working principle of 11kv drop out fuse is: the moving contacts at both ends of the fuse tube are tightened by the fuse (melt), and after the upper moving contact is pushed into the "duckbill" protruding part, the upper static contact made of phosphor copper sheet etc. presses against the upper moving contact, so the fuse tube is firmly stuck in the "duckbill". When the short-circuit current passes through the fuse and melts, an arc occurs. The steel paper tube lined in the fuse tube generates a lot of gas under the effect of the arc. Because the upper end of the fuse tube is sealed, the gas sprays to the lower end and blows out the arc. As the fuse melts, the upper and lower moving contacts of the fuse tube lose the tightening force of the fuse. Under the effect of the gravity of the fuse tube itself and the upper and lower static contact springs, the fuse tube falls rapidly, disconnecting the circuit and cutting off the faulty section of the line or the faulty equipment.
In the actual rural 10kV line system, the fuses on the distribution transformers cannot operate correctly. One of the reasons is that the quality of rural electricians is poor, their sense of responsibility is not strong, and they do not perform 11kv drop out fuse manufacturer maintenance and repair all year round; the second reason is that the quality of 33kv drop out fuse is poor, and they cannot pull and close the fuses flexibly. These two reasons reduce the function of 33kv fuse. In practice, there are often situations where the fuse tube is missing, the fuse is missing, or the fuse is replaced by copper wire, aluminum wire, or even iron wire. This makes the line trip rate and the failure rate of the distribution transformer remain high.
