Study On Dynamic Adjustment Of Contact Force Between Pantograph And Catenary And Inspection Of Quality Of Current Acquired From Catenary

The reliable touch between catenary and pantograph is critical to get quality current from catenary for keeping electric locomotive running normally.There is a standard contact force.If the force is beyond standard one,it will aggravate wear of catenary and pantograph or else pantograph cannot get enough current that is intermittent and causes electric spark and votalic arc which result in burnning down catenary and pantograph. So continually inspecting and adjusting the contact force is necessary during locomotive is moving. The contact force is normally inspected by running specialized inspection vehicle to detect. In this way, it will spend much time , influence the normal railage and can't reflec real condition of contact force in running. Nowadays,the contact forece is adjustd throrogh raising up or lowering down pantograph according to the feedback of wind pressure in normal railage. This method is simple but unprecise .Considering the current acquired from parts of catenary is not good as a result of oxidizing layer covering the categary and nonconducting parts in it. In this article, an experimental detection system based on DSP is designed to be installed in normal electric locomotive for recording the quality of absorption, and adjusting the pantograph for the contact force while the locomotive is moving. The record can also be used to locate the parts of catenary which need to be repaired. As to this inspection system, the value of contact force is acquired through the force and the acceleration sensors and then adjusted by rising and inclining pantograph which is driven by steping motor. The current acquired from catenary is analysed by DSP and recorded in memory after reduction-voltage, current and AD conversion.