Title Improving the ageing rate of transformer fleet using imperialist competitive algorithm Type of Research Article Keywords ageing rate, transformer fleet, imperialist competitive algorithm Abstract In this paper the subject of Improving the ageing rate of transformer fleet using imperialist competitive algorithm is investigated. Researchers (First Researcher)، Seyed Hadi Mousavi Motlagh (Second Researcher)، Ali Naderian Jahromi (Third Researcher)، NAVID TAGHIZADEGAN KALANTARI (Fourth Researcher)