High Voltage AC Load Insulation Drop Out Fuse

High-voltage AC load insulation drop-out fuse is an outdoor high-voltage protection appliance. 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.

Drop-out fuses and load-drop 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 on the three-blade ends on both sides of the insulating bracket. The moving contacts are installed on the fuse tube. It consists of an inner arc-extinguishing tube and an outer epoxy glass tube. The load drop fuse has enhanced elastic auxiliary contacts and arc extinguishing cover to divide and close the load current.

When a drop-out fuse is operating normally, the fuse tube catches the fuse and tensions it to form a closed position. When the system fails, the fault current causes the fuse to melt quickly and form an arc. The arc extinguishing tube is heated by the arc and decomposes a large amount of gas, which causes a high pressure in the tube and forms a longitudinal blow along the pipeline. The arc is rapidly elongated. And extinguished. After the fuse is blown, the lower movable contact loses tension and turns down. The pin tightening mechanism releases the fuse tube and continues to pull the contact with the insulating rod. The auxiliary contacts also separate, and an arc is generated between the auxiliary contacts. The arc is extinguished. The slit of the arc extinguisher is elongated, and the arc extinguishing cover generates gas, which extinguishes the arc when the current crosses zero.

1. The ambient temperature is not higher than +40°C and not lower than -40°C

2. The altitude does not exceed 1000m

3. Wind speed is not greater than 35m/s

4. The installation site should be free of gases, steam, chemical precipitation, salt spray, dust and dirt, and other explosive and corrosive substances that seriously affect the insulation and conductivity of the switch.

5. The earthquake intensity does not exceed magnitude 8

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