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The interaction of pantograph and catenary is one of the crucial topics in train and infrastructure interaction, in particular when the new EMUs (Electric Multiple Units) are using multiple pantographs. One important parameter in the design of overhead contact line is the curve of contact wire. The curve of contact wire is defined by adjusting the length and consequently the static force (dead load) of droppers. Therefore, calculating the required dead load of droppers to achieve the demanded profile of contact wire, is a crucial step in any simulation model of pantographcatenary interaction. In this study a precise analytical model of overhead catenary and pantograph has been developed and the effect of contact wire cure in the overlap section on the wave propagation in the mechanical section has been analysed. The study has focused on the German standard catenary and the results shows that abnormal static force in droppers between overlap point and tension wheel, can reduce the contact quality up to 20%.