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Copper cable short circuit current withstand

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  1. J2019L is offline Junior Member Pro Subscriber
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    Copper cable short circuit current withstand

    A 70 sqmm copper cable can withstand a short circuit current of 8.05kA for 1 second. If the protection relay operates in 0.2 second, then what is the maximum fault current that the cable can tolerate?

    The solve method seems to apply: 8.05kA * sqrt(1/0.2) = 18.0 KA
    Is there someone can find the source document to proof this concept?

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    Quote Originally Posted by J2019L View Post
    A 70 sqmm copper cable can withstand a short circuit current of 8.05kA for 1 second. If the protection relay operates in 0.2 second, then what is the maximum fault current that the cable can tolerate?

    The solve method seems to apply: 8.05kA * sqrt(1/0.2) = 18.0 KA
    Is there someone can find the source document to proof this concept?
    I2T = I2T. Damage energy remains constant.

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