In the use of large current cold pressing terminal, the grounding fault should be eliminated step by step. First, check whether there is a problem with the transformer, and then check the grounding of the distribution box. For the use of large current cold pressing terminals, the grounding should be done grounding treatment. There are also equipment in the process of normal phase line should also pay attention to eliminate grounding fault.
During the installation and inspection of large current cold pressing terminal blocks, when the power can be cut off, insulation meter or megger must be used for measurement. After that, it should be noted that sectional measurement should be carried out. As far as possible, only segments are used to measure power supply and distribution lines such as cables, wires, circuit breakers, switches, etc. when it is really difficult to segment, at this time, when it is difficult to segment That is to pay attention to must be to pull out the weak current equipment, sensor equipment on the fuse.
When using the terminal blocks, we should pay attention to the fact that the key to grounding is that the grounding resistance must be low, and at the same time, the contact area must be large. To a great extent, the former can ensure that the grounding point should have a "zero potential" as low as possible close to the ground potential.
In fact, the purpose of the terminal is to avoid the possibility that the thunder and lightning "reversely" goes back from the grounding wire after the lightning strikes, and then enters the power supply circuit. And in practical application, in terms of the latter, to a large extent, it can directly ensure that it has enough capacity to provide a fault current channel, which will include lightning or short-circuit fault and other aspects.