non-fault current at the ground grid

[jettme]

good day!

im having a problem regarding to new established substaion(115kV/34.5Kv), after its energization, current of 40amps has been read at actual test(located at the A-frame structures that holds the 115Kv Line), and also the ground conductors of the ground grid has current readings of 30+Amps, the problem now is how to locate the source of the current. can you give me some tips on how to detect it?

thanks

 

[jghrist]

Do you have a place to read zero-sequence line current? Perhaps a microprocessor relay or a meter. The ground current might be because of unbalanced load current.

 

[SMB1]

Hi, Jettem,

please loaded or unloaded line? what i understand it was not loaded.
please cofirm?

 

[davidbeach]

What's the transformer between the 115 and the 34.5? Is the 115 shielded? Probably lots of other questions to answer before you can get a useful answer, so it would be best to provide all details about the substation and all the lines in/out.