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CATAGORY: Home -> Cable-News -> Heating Factors and Attention of Cables Using

Heating Factors and Attention of Cables Using

When the power cable through a certain load current, has been higher or more than the maximum permissible continuous operating temperature of the cable (XLPE insulated cable allows 90 ℃), the cable will be a long time heat, if not find the cause of troubleshooting, the cable continues to power After the operation will produce thermal breakdown breakdown phenomenon, resulting in cable short-circuit tripping phenomenon occurs, serious may cause a fire. The heating of the cable during operation may be caused by the following reasons:

1, The cable conductor resistance does not meet the requirements, resulting in cable in the operation of the heat generated.

2, Cable selection type improper, resulting in the use of the cable conductor cross-section is too small, the operation of the overload phenomenon, prolonged use, the cable heat and cooling imbalance caused by fever.

3, The cable is arranged when the installation is too dense, poor ventilation and cooling effect, or cable close to other heat sources too close to the normal cooling of the cable, may also cause the cable in the operation of the heat generated.

4, Joint manufacturing technology is not good, crimping is not close, resulting in connector contact resistance is too large, will cause the cable to generate heat.

5, The cable insulation performance is not good, resulting in smaller insulation resistance, the operation will also produce fever.

6, Armored cable local sheath damage, after the water on the insulation performance caused by slow damage, resulting in the gradual reduction of insulation resistance, will also cause the cable to produce heat in the phenomenon.

In order to ensure the safe operation of the cable, in the cable design to select the power cable should consider the following factors:

1, The rated voltage of the cable is greater than or equal to the rated voltage of the power supply system of the installation point.

2, The cable continues to allow the current should be equal to or greater than the maximum load current of the power supply load.

3, Core cross-section to meet the power supply system short-circuit stability requirements.

4, According to the length of the cable to check whether the voltage drop to meet the requirements.

5, The end of the line minimum short-circuit current should be able to protect the device reliable action.

6, High breakdown strength.

7, Low dielectric loss.

8, A very high insulation resistance.

9, Excellent resistance to discharge performance.

10, With a certain degree of flexibility and mechanical strength.

11, Long-term stability of insulation performance.