What options can be used to deliver power to a distant PTC in this scenario?
Version 1) I can bring 230V AC by a 50 meters of cable"


Even the distribution cables are outdoors, so it's not so difficult. You can use a armoured cable and use a GFCI safety device mounted in your house. In such way, if the live wire gets damaged it will make a contact with the shield and trip the GFCI.

EDIT:



Youtube link 1

Youtube link 2