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Temperature rise determines the current carrying capacity of the busway

  • Categories:Zhongrui News
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  • Time of issue:2019-05-29 17:26
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(Summary description)In order to ensure the safe operation of the power supply system and energy saving and emission reduction, the extreme temperature rise of the busway is an indispensable technical parameter for the evaluation of the busway products. Low-voltage power transmission trunk lines include wires, cables, branch cables, busbar trunks, bare conductive strips, and puncture cables. Due to the different heat dissipation of various products, the current carrying capacity per square millimeter is also different: the same product, the same conductor specifications, when passing the same current, the temperature rise is different; the same conductor cross-sectional area, due to the design structure Different, the temperature rise is also different. Of course, as the temperature rises, the resistance increases, the voltage drop

Temperature rise determines the current carrying capacity of the busway

(Summary description)In order to ensure the safe operation of the power supply system and energy saving and emission reduction, the extreme temperature rise of the busway is an indispensable technical parameter for the evaluation of the busway products. Low-voltage power transmission trunk lines include wires, cables, branch cables, busbar trunks, bare conductive strips, and puncture cables. Due to the different heat dissipation of various products, the current carrying capacity per square millimeter is also different: the same product, the same conductor specifications, when passing the same current, the temperature rise is different; the same conductor cross-sectional area, due to the design structure Different, the temperature rise is also different. Of course, as the temperature rises, the resistance increases, the voltage drop

  • Categories:Zhongrui News
  • Author:
  • Origin:
  • Time of issue:2019-05-29 17:26
  • Views:
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In order to ensure the safe operation of the power supply system and energy saving and emission reduction, the extreme temperature rise of the busway is an indispensable technical parameter for the evaluation of the busway products. Low-voltage power transmission trunk lines include wires, cables, branch cables, busbar trunks, bare conductive strips, and puncture cables. Due to the different heat dissipation of various products, the current carrying capacity per square millimeter is also different: the same product, the same conductor specifications, when passing the same current, the temperature rise is different; the same conductor cross-sectional area, due to the design structure Different, the temperature rise is also different. Of course, as the temperature rises, the resistance increases, the voltage drop increases, and the loss of electrical energy increases. For example, when the 35mm2 wire passes the 80A current, the temperature rise is lower. When passing the current of 100A, the standard is met. If the current is 120A or 150A, the temperature rise will exceed the standard, and the insulating material will quickly age, eventually causing a short circuit accident. If the 35mm2 wire passes 100A current, each mm2 is equivalent to 2.85A current, and the other 6mm2 wire passes 38A current, which is equivalent to 6.3A current per mm2. If the 6mm2 wire also passes 2.85A per mm2, then the 6mm2 wire passes at this time. The current is 18A, and its voltage drop and electrical loss are much smaller than 35mm2, because the temperature rise of the conductor decreases, and the loss of electrical energy also decreases. The busway is also the same, so the conductivity of the busbar conductor is calculated according to the conductivity per millimeter (current density), but different design structures and heat dissipation, skin effect, and impedance, inductive reactance and other factors. It is closely related to the current carrying capacity. Therefore, the national standard GB7251-2006 (equivalent to the international electrical standard IEC60439.2-2000) stipulates that the current carrying capacity of the busway is determined by the rated current passed under the limit temperature rise value.

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