RAMS Evaluation Of Traction Power Supply System For Catenary Network

With the rapid development of electric railways, our country continuously put forward the construction investment of the high speed railways. As to the increasing speed of the locomotive, the reliability demand for traction power supply system is more and more important, which is directly relate to the normal operation of the railway system. Catenary system plays an dominant role in traction power supply system, however, it is prone to the accident. Therefore, it is important to do the accurate calculation and evaluation for catenary system reliability, and it has important significance to promote the reliability and lower the cost of entire system.In allusion to evaluate the reliability of the catenary system, this paper apply the GO method, which is a success-oriented technology for analyzing system probability and performs very efficiently in analyzing reliability of the system. Firstly, the basic principles, the process and method of the GO method is introduced in the first part. Then, based on the comprehensive analysis of basic operational rules and methods, as well as the mechanical and electrical structures of catenary system, this paper analyzes and calculates of the reliability about the six parts catenary system, which includes contact suspension, support devices, suspension subsidiary, positioning devices, compensation devices, the pillar and foundations. According to the reliability of each part, the weak links of the catenary system is analyzed. Then, this paper compares with the calculation results between the GO method and the fault tree method, the results show that the two methods have basically the same result. Secondly, the reliability under three power supply modes, including the unilateral mode, the bilateral mode and the over-section power supply mode, is evaluated and analyzed. The result shows that, in normal condition, the reliability of the catenary system under bilateral supply exceed the unilateral supply mode, in over-section supply mode, the reliability of the system is the lowest. Finally, according to the fuzzy algorithm based on credibility theory, the fuzzy evaluation of the reliability index is done in this paper. Comparing to the given precise value, the results show that the error is small, and it verify the correctness of the proposed method.Based on the previous theory, some common method, basic procedure and principles to acquire reliability allocation are introduced in this paper. And on the basis of considering the different effects, including the degree of importance, complexity, cost, maintenance factors, working environmental, technical level, reliability distribution of four parts of the catenary system are carried out using fuzzy comprehensive evaluation theory and calculate when the catenary system overall need to achieve a certain reliability, to achieve the reliability of each part.Finally, the maintenance concept, classification and basic requirements of catenary are analyzed. On the basis of considering the maintenance factors of catenary system, which includes the degree of importance, reliability, fault detection means, up to catenary system maintenance, removable, maintenance allocation of catenary system is analyzed by using fuzzy comprehensive evaluation method again.