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How can I Reduce the Failure of the High Voltage Switch Cabinet?

Feb. 22, 2020

Switch cabinets often have large and small faults in our daily use. For example, after being used for a long time by mining switch cabinets, they may cause switch cabinet failures due to improper operation and so on. This has an overall use. Great impact, then is there a way to avoid these failures or to reduce the damage to the switchgear. Next, China High Voltage Switch Cabinet Factory will explain this content in detail.

High Voltage Switch Cabinet

High Voltage Switch Cabinet

1. High Voltage Switch Cabinet failure due to ambient temperature:

The low-voltage electrical appliances in the mining switchgear are composed of fuses, AC contactors, residual current protective devices, capacitors and meters. Their normal operating conditions are stipulated accordingly: the upper limit of the ambient air temperature does not exceed 40. The average value of ambient air temperature for 24h does not exceed 35, and the lower limit of ambient air temperature is not less than -5 or -25. The switch cabinet reconstructed by the rural power grid operates outdoors.It not only generates high temperature when it is directly exposed to sunlight, but also generates heat during operation.Therefore, in the high summer season, the temperature in the switch cabinet box will reach 60 or more. If the temperature greatly exceeds the ambient temperature specified by these appliances, then failures due to overheating of the electrical components in the switch cabinet will occur.

2. Failures due to product quality:

In the reconstruction of rural power grids, because the number of mining switch cabinets is very large, but the construction period is short, the distribution box manufacturers need to supply the low-voltage electrical appliances in a hurry and in large quantities, so there will be no requirements for product quality. Strict phenomenon, then failure will occur shortly after the product is put into operation. For example, some models of AC contactors could not be operated because the contactor closing coil was burned out shortly after the distribution box was put into operation.

3. Failure of mining high-voltage switchgear due to improper selection of electrical appliances:

Due to improper selection of AC contactor capacity during manufacturing, AC contactors with the same capacity were installed for different outgoing circuits, and the imbalance of the three-phase load was not taken into account, and the current level of some of the outgoing contactors could not be selected normally. Based on the model, increase a current level selection, which also causes the AC contactor to burn out during summer high-temperature season operation. In the transformation of rural power grids, many are low-voltage electrical appliances purchased by the state. The quality requirements are not very high. The general requirement is that they can be used. As a result, users have many problems in the use process and spend a lot of money.

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