The explosion-proof distribution box is a total circuit distribution box for all users to use electricity. In the process of using, there will always be some faults, so what should I do when there is a fault? This paper describes in detail the faults and treatment methods of the explosion-proof distribution box line.
Common faults in explosion-proof distribution boxes:
1. The failure caused by product quality In the transformation of rural power grid, due to the large number of distribution boxes required and the short construction period, the distribution box factory needs the supply time of the low-voltage electrical appliances to be urgent and the quantity is large, thus producing the quality of the products. The phenomenon of not strict requirements has caused some products to fail soon after they are put into operation.
2. Faults caused by improper selection of electrical appliances in the explosion-proof distribution box Because the selection of the AC contactor capacity is not very appropriate during manufacturing, the AC contactors of the same capacity are installed for different outlet circuits, and the imbalance of the three-phase load is not considered. However, it is not possible to increase the current level selection of some of the line contactor current levels based on the normal selection model, thus causing the AC contactor to burn out during the summer high temperature season.
Treatment plan for explosion-proof distribution box:
1. Use a protection circuit to prevent the occurrence of external circuit faults in the power distribution box.
2. Select the energy-saving AC contactor product, and pay attention to the voltage of the AC contactor coil connected to the corresponding terminal of the selected residual current action protector, pay attention to the correct load matching.
3. The low-voltage cable is used for the input and output lines of the distribution box. The cable selection should meet the technical requirements.
4. The rated current of the low-voltage side total over-current protection fuse of the distribution transformer should be greater than the rated current of the low-voltage side of the distribution transformer, generally 1.5 times of the rated current. The rated current of the melt should be based on the overload factor allowed by the transformer. And fuse characteristics are determined.
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