Some Points to note when operating drop-out fuses cutout

When the drop-out fuse is in operation, when the power supply line has a short-circuit fault, the strong short-circuit current can quickly disconnect the high-voltage fuse. At this time, the upper and lower contacts of the fuse tube lose tension due to the disconnection of the fuse. Under the weight of the fuse tube and the action of the upper and lower contact springs, the fuse tube can quickly fall down, making The circuit is broken.

When operating the drop-out fuse, you need to pay attention to the following six aspects:

1. When opening the drop-out fuse, the operator must use an insulating rod with a suitable voltage level and passed the test. At the same time, wear insulating shoes and protective equipment such as insulating gloves. Or stand on a dry wooden bench to operate, and someone needs to supervise during the operation to protect personal safety.

2. When the operator pulls and closes the drop-out fuse, there must be no impact. The impact will damage the fuse, resulting in damage to the insulator, the duckbill, and the operating ring being pulled off. Therefore, when opening and closing the drop-out fuse, the staff should avoid excessive force to avoid damage to the fuse.

3. Do not operate the drop-out fuse in strong wind or rain or snow. When you have to operate in bad weather, you should use an insulated rod with a rain cover. It is strictly prohibited to operate and replace the fuse during lightning.

4. If there is any doubt or abnormality during operation, the operation should be stopped, and the operation can be continued after the problem is found out.

5. When there is equipment abnormality, signs of serious transformer failure, such as abnormal sound, fuel injection, etc., abnormal light and sparks, abnormal smells, etc. All should stop operating the high voltage drop switch immediately.

6. The operating sequence of the high-voltage drop-out fuse is as follows:

When power-off operation, first pull out the middle phase, and then pull out the two side phases. When powering on, the opposite is true, the two side phases are combined first, and then the middle phase is combined. The reason why the middle phase is first opened when the power is cut off is mainly considering that the current when the middle phase is cut off is smaller than that of the side phase, so the arc is relatively small and there is no danger to the two phases. When the second phase (side phase) drop-out fuse is operated, the current is large, and the middle phase has been opened at this time, and the other two fuses are far apart, which can prevent the short circuit caused by the elongation of the arc. When encountering strong winds, first pull the middle phase, then pull the leeward phase, and finally pull the windward phase for power outage. When power is supplied, the windward phase is first, then the leeward phase, and finally the middle phase, so as to prevent short circuit caused by wind blowing and arc.