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What are the Conditions Required to Properly use the Low Voltage Switch Cabinet?

Mar. 02, 2020
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As a Low-Voltage Power Distribution Cabinet Factory, share with you. Choosing the appropriate external dimensions are very important for the low-voltage electrical switch cabinet and low-voltage power distribution cabinet to be able to run safely in the future. If the size is selected too small, higher requirements are imposed on the product insulation, mainly in the bushing, Head box, busbar surface insulation treatment, etc .; if the size is too large, more commercial requirements are put forward for product manufacturing, mainly in terms of handcart interchangeability, chain reliability, cabinet strength, etc.

Low Voltage Switch Cabinet

Low Voltage Switch Cabinet

High Voltage Switch Cabinet normal use conditions:

Altitude: generally does not exceed 1000 meters. For equipment installed at an altitude above 1000 meters, the insulation level of the external insulation should be the required insulation withstand voltage multiplied by the correction factor Ka [ka = 1 ÷ (1.1-H × 10-4)] to decide. Because the air is thin at high altitudes and the external insulation of electrical appliances is prone to breakdown, reinforced insulation-type electrical appliances are used to increase the air insulation distance or increase insulation protection measures in the switchgear. 

Environmental humidity: the daily average is not greater than 95%, and the monthly average is not greater than 90%. Earthquake intensity: no more than 8 degrees. What size of switchgear is good?

At present, there are many external switch cabinets in China, including: width x depth x height 1200 x 2600 x 2400 (mm); width x depth x height 1400 x 2800 x 2600 (mm); width x depth x height 1680 x 3000 x 2600 (mm) and so on.

Ambient temperature: The ambient air temperature does not exceed 40 ° C (upper limit), generally -5 ° C (lower limit), and severely cold areas can be -15 ° C. If the ambient temperature is too high, the conductivity of the metal will decrease, the resistance will increase, and the surface oxidation will increase. On the other hand, too high temperature will greatly shorten the life of the insulation inside the cabinet and reduce the insulation strength. Conversely, if the ambient temperature is too low, internal stress will be generated in the insulation, which will eventually lead to damage to the insulation. 

The selection of the depth of the switchgear is relatively easy: if the conditions of the power distribution room allow, the depth is preferably 3000mm, which can ensure ample cable room space (while improving insulation performance), and facilitate daily debugging and maintenance. Make the switchgear suitable for more system solutions.

Low Voltage Switch Cabinet ground protection is to connect some conductive parts of the power system, electrical devices or facilities in the building to the ground electrode through the ground wire. The electrical insulation of the metal casing of the electrical device, the structure of the power distribution device, and the line pole tower may be charged. The grounding measures are taken to prevent personal and equipment safety.