Abstract:Based on the integral method analyzes the electromagnetic coupling between the control cable and the catenaries, a calculation formula of control cable’s inductive voltage has been deduced. Under the conditions of the AT power supply and simulation of the locomotive by the pantograph and the catenary contact and separate two different circumstance. The end’s inductive voltage of control cable was simulated. From the simulation’s conclusion, the control cable’s induced voltage mutated and many harmonics and the induction voltage is very large, when the contact and separation of the locomotive with the catenary. Catenary cable control electromagnetic interference cause malfunction of the catenary switches