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Mobile WebSiteThere are many copper-aluminum transition terminals on the cable connector, but many times we will find that the terminal will be blown after a period of use. The reason for this situation is followed by a small series to talk to you.
1. The quality of the terminal product itself does not meet the requirements. The main problems are: the screw hole is too large, the contact area of the terminal is reduced, the fixing bolt is easy to loose; the outer diameter of the terminal is thinner, the wall of the tube is changed; the depth of the tube is changed. The shallow, wire insertion portion becomes shorter; the copper length of the copper-aluminum transition portion is shortened; the width of the contact surface portion is reduced, so that the contact area is reduced; and the thickness of the contact surface portion is reduced to cause a fusing condition.
2. The installation is not in place. For example, during the installation process, the terminal block and the equipment clamp are not well connected, and this is one of the conditions for ensuring safe power supply. After the occurrence of the outdoor cable head terminal fuse, after careful Inspection, found that the lead clip and the contact portion of the terminal have a melting point, which is also the corrosion of the copper and aluminum two different metal contact caused by contact with the contact surface caused by overheating.
3. The load distribution is unreasonable. That is to say, in the process of electric energy transmission, if the load of each phase is not uniform, the load of one phase or two phases will be lower, the load of the other phase or two phases will be higher, and the load current will be too long. It increases the probability of failure of the cable line, accelerates the insulation aging, shortens the service life of the cable, and causes the external contacts of the terminal block to be overheated and damaged, and the hazard of overloading the cable line is obvious.
After understanding the cause of the copper-aluminum transition terminal block, it is clearer than everyone else how to deal with it.
