A Study On Distribution Of Current In AC Overhead Contact Line

With the continuous accumulation of high-speed railway operating experience,the problem of the string breaking occurs,and the influence of the suspended string on the current distribution of the contact suspension is less.Usually the contact line,steel rail and ground are used as a whole to study the current distribution of traction network.However,the distribution of the current in the contact line is not analyzed separately.In the contact line,the current path is more complex.When the contact line is studied as a whole,if the dropper and electrical connection failure,it is not possible to accurately analyze the specific segments.Therefore,it is very important to study the current distribution of AC contact line.In China,in the construction or construction of high-speed railway contact line usually uses the non-adjustable current carrying dropper,in the special area restricted by the environmental conditions(such as Xinjiang and other cities in the wind region),the contact line uses the non-current carrying dropper.In order to study the advantages and disadvantages of current carrying dropper and non-current carrying dropper of contact line and get electric connection settings recommended,it is suggested that the current distribution of contact line should be studied theoretically when the different electrical characteristics are used.Based on this,the paper specifically carried out the following three aspects:1.The OCS test platform full tensioning stitch contact line based on experiment,obtained current distribution test data from the dropper,contact wire,messenger wire of contact line,and according to the clue parameters in the experimental platform,the establishment of the current distribution model of the catenary,the current distribution data of every wire in the model calculation,error analysis of experimental data and calculation data,verified the reliability of current distribution model.2 According to the wires parameters in the experimental platform,established the current distribution model of contact line.The current distribution data of every wire in the model calculation,error analysis of experimental data and calculation data,verified the reliability of current distribution model.3.According to the verified current distribution model,the current distribution model of the current carrying and non-current carrying dropper contact line is established under the condition of non-electrical connection,and the data of the current distribution of the contact line are calculated.By comparing the two sets of current distribution data,it is found that the maximum current(303.8A)of the contact wire passing through the current carrying dropper contact line is smaller than the current(309.9179A)of the contact wire in the contact line than in the non-current carrying dropper,it can be seen that the current performance of the current-carrying line is better.4.In order to optimize the electrical performance of non-current carrying dropper contact line,when the pantograph catenary is located at the first of the contact line and the current rate of the pantograph is 490A,an electrical connection is set in 120000m,600m,400m and 200m in an anchor section.By calculating the current of the contact wire,considering the reliability,economical and practical point of view,it is concluded that the electrical performance of the contact line is optimal when an electrical connection is set at 200m in an anchor section.