Outdoor Column Mounted Ceramic High Voltage Drop Fuse

The outdoor column-mounted ceramic high-voltage drop-out fuse is a device that protects power and electrical equipment. When a short circuit or overload occurs on the line, the fuse blows and cuts off the current, thereby protecting the circuit and equipment. It has the advantages of strong breaking capacity, easy replacement of fuse parts, safety and reliability.

Outdoor column-mounted ceramic high-voltage drop-out fuses and load-load drop-out fuses are outdoor high-voltage protection appliances. It is installed on the high-voltage side of the distribution transformer or the branch line of the distribution line, and is used for short-circuit and overload protection of the transformer and lines, as well as for dividing and combining the load current. The drop-out fuse is composed of an insulating bracket and a fuse tube. The static contacts are installed at both ends of the insulating bracket, and the moving contacts are installed at both ends of the fuse tube. The fuse tube consists of an inner arc-extinguishing tube and an outer layer. Composed of phenolic paper tube or epoxy glass cloth tube. The load-pull drop-out fuse has enhanced elastic auxiliary contacts and arc extinguishing cover to divide and close the load current.
When the outdoor column-mounted ceramic high-voltage drop-out fuse is in normal operation, the fuse tube is tensioned by the fuse to form a closed position. When the system fails, the fuse melts quickly during the fault current, and an arc is formed. The arc-extinguishing tube is heated by the arc and decomposes a large amount of gas. A very high pressure is formed in the embassy, and a longitudinal blow is formed along the pipeline, and the arc is rapidly elongated. And extinguished. After the fuse is blown, the lower moving contact loses tension and turns downward, locks the machine, 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 contact. At this time, the active and static contacts are still in contact. Continue to use the insulating rod to pull the contact, and the auxiliary contacts will also separate. An arc will be generated between the auxiliary contacts. It is stretched in the slit of the arc extinguishing cover, and at the same time, the arc extinguishing cover generates gas, which extinguishes the arc when the current crosses zero.

Outdoor column-mounted ceramic high-voltage drop-out fuses are suitable for power systems with voltages of 35kv and below and frequency of 50Hz, for overload and short-circuit protection of transmission lines and power transformers. The rated load current of opening and closing is only used, and the mechanical life is ≥2000 times.

Applicable to ambient temperature upper limit 40℃, lower limit -30℃。

The altitude does not exceed 1000m and the wind speed does not exceed 35m/s.

The fuse is not suitable for use in the following places:
3.1Places with fuel or explosion hazards
3.2Places subject to severe vibration or impact.
3.3Areas with different electrochemical gas effects and severe air pollution and smog

The fuse is composed of two parts: the base and the arc extinguishing device. The lower end of the arc extinguishing tube is equipped with a spring bracket that can rotate, which always keeps the fuse in a tense state to ensure that the arc extinguishing tube is self-locking in the closing position, and the circuit is connected to the arc extinguishing tube. When the transformer is overloaded or short-circuited, the fuse blows and the fuse is quickly pulled out of the arc extinguishing tube. The arc extinguishing tube is designed with a step-by-step exhaust type to solve the problem of breaking large and small currents on the same fuse.

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