Explosion-proof distribution box three major causes of failure analysis 1, explosion-proof electrical distribution box caused by improper selection of electrical equipment due to the inappropriate choice of AC contactor capacity in the manufacture of different outlet circuit installed with the same capacity of the AC contactor, and no Taking into account the three-phase load imbalance, but can not be part of the line contactor current level on the basis of the normal choice of models, improve the choice of a current level. If the fault caused by improper selection, we still need to pay attention.
2. Faults caused by product quality At the time of the rural power grid reconstruction, due to the large number of power distribution boxes required and the short construction period, explosion-proof power distribution box manufacturers needed urgent and large quantities of low-voltage electrical appliances to supply them, resulting in product quality. The non-strict requirements caused some products to fail shortly after they were put into operation. Some AC contactors could not operate because the contactor closing coil burned shortly after the distribution box was put into operation.
3. The low-voltage electrical equipment in the explosion-proof power distribution box caused by the impact of ambient temperature on low-voltage electrical appliances is composed of fuses, AC contactors, residual current action protectors, capacitors and meters. The upper limit of the ambient air temperature does not exceed 40°C; the average value of the ambient air temperature 24h does not exceed 35°C; the lower limit of the ambient air temperature is not less than -5°C or -25°C.
The power distribution box transformed by the rural network is running outdoors. It not only receives the high temperature generated by direct sunlight, but also generates heat during its operation. Therefore, during the high temperature season in summer, the temperature in the cabinet will reach above 60°C. At this time, the temperature greatly exceeds. The ambient temperature specified by these appliances. Therefore, the ambient temperature has a great influence on it and it is easy to fail.
2. Faults caused by product quality At the time of the rural power grid reconstruction, due to the large number of power distribution boxes required and the short construction period, explosion-proof power distribution box manufacturers needed urgent and large quantities of low-voltage electrical appliances to supply them, resulting in product quality. The non-strict requirements caused some products to fail shortly after they were put into operation. Some AC contactors could not operate because the contactor closing coil burned shortly after the distribution box was put into operation.
3. The low-voltage electrical equipment in the explosion-proof power distribution box caused by the impact of ambient temperature on low-voltage electrical appliances is composed of fuses, AC contactors, residual current action protectors, capacitors and meters. The upper limit of the ambient air temperature does not exceed 40°C; the average value of the ambient air temperature 24h does not exceed 35°C; the lower limit of the ambient air temperature is not less than -5°C or -25°C.
The power distribution box transformed by the rural network is running outdoors. It not only receives the high temperature generated by direct sunlight, but also generates heat during its operation. Therefore, during the high temperature season in summer, the temperature in the cabinet will reach above 60°C. At this time, the temperature greatly exceeds. The ambient temperature specified by these appliances. Therefore, the ambient temperature has a great influence on it and it is easy to fail.
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