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Cable Protection - Protecting Shield Wire from a Ground Fault?

Cable Protection - Protecting Shield Wire from a Ground Fault?

Cable Protection - Protecting Shield Wire from a Ground Fault?

(OP)
Protection Guru,

When checking 34.5kV feeder relay ground element settings for cable protection, is it necessary to consider protecting a cable from a feeder ground fault with all the ground fault current returned via the shield wire (1/3 netural)?

Thank you,
Best Regards,
Bing

RE: Cable Protection - Protecting Shield Wire from a Ground Fault?

You need to be concerned about the short-time thermal rating of the shield.  Even with a separate external ground wire, the shield will carry a lot of current during ground faults.  It's generally not a big problem.  Okonite has data on this in their cable handbook, IIRC.  

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