There are different definitions and standards of high-speed railway in different countries. However, generally it refers a railway system that can allow trains to run at a maximum speed of 200 km/h or above, while the overhead contact system applicable for high-speed electrified railway operation are known as high-speed railway overhead contact system (OCS). Compared with conventional OCS, high-speed railway OCS imposes higher technical requirements on mechanical and electrical strength, system elasticity and uniformity, pantograph-catenary vibration characteristics of their equipment and components. High-speed railway OCS is a complex mechanical current carrying system set up above the high-speed railway track. It is composed of various equipment and different types of components that are connected and assembled in an orderly manner, forming a supporting structural network for supplying electrical energy to electric multiple units (EMU). Unlike the distribution or transmission networks of a power system, OCS transmits electrical energy to EMU through high-speed sliding contact with the pantograph.