If any HVDC line is going with positive & negative(the negative usually ha

If any HVDC line is going with positive & negative(the
negative usually have return path of current with earthing
electrode).
Now the question is if this HVDC earthed electrode which is
using as return path and earthed any nearby 400kv or 220kv
AC substation equipments.
which will be the impact of this on AC substation & its
equipment, how severe may be this and what should be the
minimum distance require between HVDC earthed electrode and
AC substation equipments?

It's really an high engineering level question...Dare to
answer and increase your knowledge.

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