The bus size of confluence aluminum in a substation is 63mm-8mm, the skin effect coefficient Ks-1.03....

 

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The bus size of confluence aluminum in a substation is 63mm-8mm, the skin effect coefficient Ks-1.03. Under normal operation, the temperature of bus is 0-50°C ,and cutting time of short circuit is tk-2.6s, short circuit I" 15.8KA, I1.3=13.9kA, I2.6-12.5kA. The equivalent time of the aperiodic component is 0.05s. (Note: In case of short circuit operation, The allowable tempurature of hard aluminum can be 200°C) (1) Why to do short-term heating calculation? (3points) (2) When selecting a disconnector, do you need to select or check it according to the rated breaking current? And why? (6 points) The bus size of confluence aluminum in a substation is 63mm-8mm, the skin effect coefficient Ks-1.03. Under normal operation, the temperature of bus is 0-50°C ,and cutting time of short circuit is tk-2.6s, short circuit I" 15.8KA, I1.3=13.9kA, I2.6-12.5kA. The equivalent time of the aperiodic component is 0.05s. (Note: In case of short circuit operation, The allowable tempurature of hard aluminum can be 200°C) (1) Why to do short-term heating calculation? (3points) (2) When selecting a disconnector, do you need to select or check it according to the rated breaking current? And why? (6 points) The bus size of confluence aluminum in a substation is 63mm-8mm, the skin effect coefficient Ks-1.03. Under normal operation, the temperature of bus is 0-50°C ,and cutting time of short circuit is tk-2.6s, short circuit I" 15.8KA, I1.3=13.9kA, I2.6-12.5kA. The equivalent time of the aperiodic component is 0.05s. (Note: In case of short circuit operation, The allowable tempurature of hard aluminum can be 200°C) (1) Why to do short-term heating calculation? (3points) (2) When selecting a disconnector, do you need to select or check it according to the rated breaking current? And why? (6 points) The bus size of confluence aluminum in a substation is 63mm-8mm, the skin effect coefficient Ks-1.03. Under normal operation, the temperature of bus is 0-50°C ,and cutting time of short circuit is tk-2.6s, short circuit I" 15.8KA, I1.3=13.9kA, I2.6-12.5kA. The equivalent time of the aperiodic component is 0.05s. (Note: In case of short circuit operation, The allowable tempurature of hard aluminum can be 200°C) (1) Why to do short-term heating calculation? (3points) (2) When selecting a disconnector, do you need to select or check it according to the rated breaking current? And why? (6 points) The bus size of confluence aluminum in a substation is 63mm-8mm, the skin effect coefficient Ks-1.03. Under normal operation, the temperature of bus is 0-50°C ,and cutting time of short circuit is tk-2.6s, short circuit I" 15.8KA, I1.3=13.9kA, I2.6-12.5kA. The equivalent time of the aperiodic component is 0.05s. (Note: In case of short circuit operation, The allowable tempurature of hard aluminum can be 200°C) (1) Why to do short-term heating calculation? (3points) (2) When selecting a disconnector, do you need to select or check it according to the rated breaking current? And why? (6 points)

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The skin effect coefficient Ks is 103 Under normal operation the temperature of bus is 850C and cutt... View the full answer