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Technical Q & A

How to choose drop out fuse? What are the frequent failures?

After the melt of drop out fuse is broken, the melt tube can not fall down quickly. The key is the poor installation.
 
(1) the drive shaft is not smooth and the rotation is not convenient, or the dissolving tube is blocked by other dirt, which makes the rotation of the solution tube stuck. The drive shaft can be polished with coarse sanding paper, or the dirt in the solution tube can be cleaned up.
 
(2) the installation of the upper and lower drive shafts is skewed, and the elevation angle is problematic. The effect of the weight of the solution tube alone is not allowed to fall quickly. It should be properly installed according to the regulations, and the elevation angle should be adjusted between 15 ° and 30 °.
 
(3) the note of the melt tube is too shallow, and the melt tube is too thin, which causes sticking. Even if the melt tube is broken, the melt components are not easy to slip off from the tube, so that the melting tube can not fall off quickly. Therefore, the notes of supporting facilities of the corresponding specifications and models should be installed.
 
The melting tube burning of drop out fuse is usually caused by poor installation and improper selection of circuit breaker specifications and models.
 
(4) in the small and medium-sized power grid, most of the melting tubes are burnt out because the solution can not fall down quickly after melting. The solution can be solved by referring to the above example.
 
(5) in a large power network, if the short-circuit capacity exceeds the breaking capacity of the circuit breaker due to improper selection of circuit breaker specifications and models, and the melt tube is burned out, the circuit breaker specifications and models can be effectively selected according to the size of short-circuit capacity. The rated voltage of the solution is compatible with the transformer.
 
It is generally caused by poor assembly line, lost operation and improper selection of solution.
 
(6) There is a problem between the length of the solution tube and the specifications of the fixed contact part of the circuit breaker. When encountering strong wind, the solution pipe is very easy to blow off, so it should be reassembled, and the distance between copper sleeves on both sides of the solution pipe should be appropriately adjusted.
 
(7) the operator is careless, so that the solution tube is not closed tightly, resulting in poor coordination between the dynamic and static contact points, and they fall down spontaneously due to slight vibration. During actual operation, it is necessary to check several times and observe the mutual cooperation. The actual operation ring can be touched by the end of the insulating rod and gently shaken twice, so as to make sure it is tight.
 
(8) if the elastic yellow working pressure of the static contact point at the upper end of the circuit breaker is too small, the licking tongue in the duck cap (top cover of the circuit breaker) is damaged or damaged, and the solution tube cannot be resisted, so the circuit breaker should be replaced.
 
(9) the quality of the melt tube itself is not very good, and the welding joint of the electric welding is loosened due to the temperature and the mechanical effect of the mechanical equipment, so the qualified solution should be replaced.
 
(10) if the solution is disassembled and replaced several times, and the melt is broken continuously, it is because the volume of the solution is too small, or the next level is not well coordinated, so the suitable solution should be selected again.
 
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What are the frequent failures of drop out fuse?
 
With the development of the times, the materials like drop out fuse are more and more excellent, and this drop down fuse is the leader of the disconnector. For example, before or during the application, some unknown common faults or some improper operation of human factors caused the machine equipment not so good. How should people handle and master it
 
At the time of application, people found that the drop out fuse burned to understand that most of the problems occurred after the fuse was blown. Since there was no automatic fall after the fuse was blown, then the electric arc would appear in the water pipe continuously, and then the water pipe would be burned. At this moment, people must quickly turn off the switching power supply and must maintain the protection Maintenance to see a drop type fuse has wood, often due to the left and right rotation of the shaft wood has a wrong installation, if not, people must check whether the wood is blocked or blocked by dirt. Due to the large friction resistance, there is no way to take the water pipe out, because the size of the friction resistance will cause inflexible these unique reasons.
 
When you are in the application, if the common fault of the drop out fuse is abnormal, the key reason is that the specifications of the drop out fuse of some power switches and this machine equipment are not matched, which will cause the drop out fuse very much It is very easy to fall down or cause looseness. If the specification is matched or there is such a problem, it must be checked that the working pressure of the circuit breaker spring at the upper end is very small, and the burning or damage of the inclined convex area within the duckbill valve will cause such a situation. There is also a unique situation, that is, there is a problem in the angle of view at the time of installation, which will endanger the time of water pipe falling. This will mean that the fuse parts are too thick and the hole of drop out fuse is too thin. In that case, even if the fuse is blown, the fuse components can't slide from the inside of the pipeline, so that the water pipe can't fall down beyond the expected actual effect.
 
If the capacity of the fuse is not lower than the rated value of the fuse, it is easy to say that if the fuse capacity is not lower than the rated value, then the fuse will fall Generally, there are some problems in the selection of fuse. If the selection is very small or the matching with the volume of fuse is difficult, cross level incorrect breaking will occur. In that case, it will be caused by the failure to replace the drop out fuse with large space immediately after selecting the transformer with large space.
 
Naturally, there will be a drop out fuse with poor quality after the original factory, which will cause the problems mentioned above. Of course, there is also a kind of old-fashioned commercial fuse which is welded by tin aluminum alloy welding. Because of the temperature damage, the fuse will change its characteristics. It is very easy for air oxidation and corrosion, and it is very easy to produce incorrect fusion The status of the break.
 
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