Note on operation of drop-out fuse

As a short-circuit protection switch, the drop-out fuse has the characteristics of economy and convenient operation. And the ability to adapt to the environment is among the best in similar products.

However, although the performance of the drop-out fuse is excellent, if you do not pay attention to the operation, it may affect the performance. In normal times, it is not allowed to carry a drop-out fuse that conforms to the operation, and only operate the no-load equipment. However, there are also exceptions. If the branch line of the rural power grid 10kV distribution line and the distribution transformer with the rated capacity less than 200kVA are allowed to operate with load according to the following requirements:

There are 4 notes for drop-out fuses.

First, the operation must be carried out by two persons in cooperation (the operation is carried out by another person under one supervision). Operators of cold-shrinkable cable terminals must wear qualified insulating gloves, insulating shoes and protective goggles. However, it is prohibited to operate in thunderstorm or heavy rain.

Second, pay attention to the sequence of a switch. The prescribed order is first in the middle, then the leeward side, and finally the windward side. This is also due to the reason that the distribution transformer is changed from three-phase operation to two-phase operation. Because the electric spark generated by breaking the middle phase is the smallest, no short circuit will be generated. After that, the distance between the leeward side and the windward side of the European-style cable connector has doubled. If there is a voltage, the possibility of causing a short circuit between the phases will be much smaller. When the windward side phase is finally broken, the current generated at this time is no longer a threat.

Third, pay attention to the reverse of the operating sequence when closing, which is the reverse of the third step.

Finally, because the operation of this fusion tube is troublesome, it is necessary to always pay attention to whether the contacts are in poor contact, so as not to cause the contacts to overheat and create a vicious circle.

Yichang Hengyuan Technology Co., Ltd. is a professional manufacturer of European-style cable connectors, plug connectors, cable branch boxes, American elbow connectors, high-voltage vacuum circuit breakers, high-voltage load switches, lightning arresters, zinc oxide arresters, tank arresters, overvoltage protectors, Counters, monitors, heat-shrinkable cable accessories, cold-shrinkable cable accessories, T-shaped heads, wall bushings, European cable accessories, American cable connectors, transformer neutral point protection devices, fuses, isolation switches, PT cable heads, elbows Manufacturers of type cable joints, 10kV outdoor terminals, switch cabinets, cable intermediate joints, cable accessories and other products