Can a third party request/obtain a restraining order on my behalf without me being consulted or having any knowledge?

That is a hard question to answer. If you are a minor, then a parent or guardian may have requested one. In that case, they would not need your knowledge or consent. If you are the victim of a crime, the state may have requested one on your behalf in the form of bail conditions. More information would be needed as to what happened to be able to answer your question.

A parent may get a restraining order for the protection of a child without the child's consent. A guardian may also get restraining order for the protection of the ward. You should consult with a lawyer regarding your rights.