Usage of optical fibers for temperature monitoring along fiber routing in hv equipment

High Voltage (HV) equipment comprising:

• at least one HV element configured to operate in a HV region of said HV equipment;
• at least one optical fiber installed within said HV region configured to provide communication to said at least one HV element;
• and
• at least one sensing optical fiber, each sensing optical fiber comprising at least one temperature sensitive portion,
• wherein said at least one sensing optical fiber is routed together with said at least one installed optical fiber into said HV region, and arranged within said HV region so that said at least one temperature sensitive portion is arranged to sense temperature associated with an element of interest, said element of interest being one of said at least one HV element and at least a portion of said at least one installed optical fiber, said at least one sensing optical fiber being optically connectable to a temperature sensing arrangement for determining a temperature associated with said element of interest based on light interaction with said at least one temperature sensitive portion of said at least one sensing optical fiber.