What are the application characteristics of 10kV drop out fuse? What to do if the fuse tube of fuse is damaged?
The selection of 10kV drop out fuse is based on the two basic parameters of rated voltage and rated current, which means that the rated voltage of the circuit breaker must be consistent with the rated voltage of the machine equipment (route) to be maintained. The rated current of the solution or the rated current of the device should exceed that of the fuse.
The rated current of the aqueous solution can be selected as 1.5 to 2 times of the total flow rate of the rated output power. In addition, the compressive strength of the selected fuse should be checked according to the three-phase short-circuit capacity of the maintenance system. Ensure that the three-phase short-circuit capacity of the system to be maintained is less than the breaking capacity limit of the fuse Lower limit of breaking volume beyond rated value 。
If the rated value of the fuse is large, the three-phase short-circuit capacity of the system will be maintained less than the low limit of the rated value of the fuse, which may lead to the melting of water solution. The electric arc can not be destroyed, and finally the safety tube is destroyed, explosion and other safety accidents. Some power supply and distribution system companies are still in the peak of upgrading the Internet in agriculture and animal husbandry. When applying this kind of safety management, it is necessary to strictly control the product quality, maintain the qualified computer equipment license certificate, and pay attention to the specified value of its rated value interruption. And its limits.
10kV drop out fuse is composed of two parts: insulation support point structure and fuse tube. The static contact is installed on the insulation support point structure, and the mobile contact point is installed on both sides of the fuse tube. The wire sleeve consists of arc extinguishing tube and surface layer. The test tube was composed of epoxy resin glue glass. The tube type contacts can be referred to with an extended arcing cover. It is used to share the total load flow. Ew12-10 / 100arw12-10 / 200A slip fuse tube when all normal operation, 10kV drop out fuse tube with the aid of the fuse tube to tighten and produce a closed position. When the system causes mechanical fault, the electric arc will be caused in the middle of the auxiliary circuit breaker, and the electric arc will be elongated when the arc extinguishing cover is narrow, and the arc extinguishing cover will cause the steam body to be extinguished when the arc is extinguished. Zero is the total flow.
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Solution for the damage of fuse tube of drop out fuse:
In the whole process of drop out fuse, the damage of fuse tube of high voltage fuse often occurs, as if it can't be prevented. In fact, it's not. The solution people take after the damage of fuse tube decides whether the fuse tube will be damaged! The fuse tube of high voltage fuse consists of an arc suppression tube in the inner layer and an epoxy resin glass test tube on the surface. When the drop out fuse operates normally, the fuse tube will close after being tightened by the fuse. When the system software has common faults, the common fault current causes the fuse to melt off and produce an electric arc. The arc suppression tube is heated by the arc suppression tube, and a lot of steam body is decomposed, so that a high working pressure is generated outside the pipe, and longitudinal blowing is generated along the pipeline. The electric arc is rapidly lengthened and blown out. In addition, the external spring yellow support bracket quickly ejects the fuse from the outside of the fuse tube, and the lower moving circuit breaker loses the support force and turns down, The high-voltage through wall bushing drops rapidly under the thrust of left and right malleable circuit breaker and the weight of melting tube, resulting in significant breaking position.
The reason for the ablation of drop out fuse is that the contact pressure of dynamic and static contacts of drop out fuse is too high. When overload or short circuit fault occurs, the fuse tube of high voltage fuse can not fall down automatically after melting. When installing drop out fuse, it is necessary to operate according to the actual process, otherwise the fuse tube will be easily damaged. When installing, check whether all the special tools are available, and then use the electroscope to carry out power engineering detection on both sides of the high-voltage fuse. After it is clear that there is no power, the type of high-voltage fuse should be checked clearly No. 1 specification and working voltage, to clear the high-voltage fuse clean, and then only install suitable fuse for the high-voltage fuse, and finally make sure that the high-voltage fuse installation is not incorrect, after all can work normally, the work can be finished!
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