Computer Engineering and Applications ›› 2013, Vol. 49 ›› Issue (11): 208-212.

### Research of optimal normal load in sliding electrical contacts with high current

CHEN Zhonghua, KANG Liqian, HUI Lichuan

1. Faculty of Electrical and Control Engineering, Liaoning Technical University, Huludao, Liaoning 125105, China
• Online:2013-06-01 Published:2013-06-14

### 强电流滑动电接触下的最佳法向载荷研究

1. 辽宁工程技术大学 电气与控制工程学院，辽宁 葫芦岛 125105

Abstract: The large wear of slide plate and instability of current-carrying in pantograph-catenary system is a key problem, which has restricted the development of the electrified railway to high speed, heavy load, safety and stability, and should be solved by adopted effective measures in our country. Under the special current-carrying and sliding speed conditions, the wear rate of slide plate which characterizes the wear speed of the pantograph slider decreases first and then increases, which shows the changing trend of U-type while the normal load increasing. But the stability coefficient of current-carrying which characterizes the stability of the contact current will decrease with the increase of normal load. So there is a suitable normal load to make the wear of slide plate and stability of current-carrying relatively optimal. A number of experiments under different conditions are done to get the data about the wear rate of slide plate and stability coefficient of current-carrying firstly, in which the steeped metal carbon slider and copper conductor are used. Based on these data, a BP neural network nonlinear model is built, whose inputs are normal load, current-carrying and sliding speed, and outputs are wear rate of slide plate and stability coefficient of current-carrying. Then some parameters are optimized by the genetic algorithm. And the particle swarm algorithm is used to optimize the multi-objective problem when the current-carrying and sliding speed are given. At last the Pareto set with the best normal loads are obtained to make the wear rate of slide plate and stability coefficient of current-carrying minimal.