Parelled cables and step distance relaying

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mbrooke

Batteries Included
Location
United States
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Technician
Can paralleled cables (242kv XLPE, 1,500cu) be protected via a single CT or does each cable need its own CT? I'm thinking that theoretically it will work if the impedance is set to account for only one cable, however I am not sure if mutual coupling will cause over or under reaching. Each 3 phase set is cross bounded on the ground shield and each phase in its own conduit.
 
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