Optimal Condition-Based Maintenance Strategy Under Periodic Inspections for Traction Motor Insulations
Insulation failure is a crucial failure mode of traction motors. Insulation deteriorates under both fatigue load and shock. This paper focuses on proposing an optimal insulation condition-based maintenance strategy. By combining the information obtained f
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Contents 1 2 3
Introduction.......................................................................................................................... Problem Statement and Description.................................................................................... Mathematical Model Development ..................................................................................... 3.1 Failure Rate of Insulations Under Shocks ................................................................. 3.2 State Transition Probability During a Single Inspection Interval ............................. 3.3 Mathematical Models for the Variables in the Optimization Model ........................ 4 Special Case......................................................................................................................... 4.1 State Transition Probability Within One Inspection Interval .................................... 4.2 Mathematical Models for the Variables in Optimization Model .............................. 4.3 Probability of PM, CM, and the Expected Number of Inspections in One Cycle... 5 Numerical Investigation and Discussion............................................................................. 6 Conclusions.......................................................................................................................... References ..................................................................................................................................
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J. Zhang X. Huang Y. Fang College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China J. Ma (&) China Academy of West Region Development, Zhejiang University, Hangzhou 310027, China e-mail: [email protected] H. Zhang Department of Electrical and Electronic Engineering, The University of Nottingham, Nottingham NG7 2RD, UK © Zhejiang University Press, Hangzhou and Springer Nature Singapore Pte Ltd. 2018 Y. Fang and Y.H. Zhang (eds.), China’s High-Speed Rail Technology, Advances in High-speed Rail Technology, https://doi.org/10.1007/978-981-10-5610-9_29
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1 Introduction Traction motors are key parts of high-speed trains (Fang 2011), and insulation failure is a key failure mode. There are about 37% of traction motor failures resulting from insulation failures (Zhou et al. 2006). The reliability of insulation has a direct effect on the safety and performance of high-speed trains. At the rated rotating speed, the winding insulation of traction motors is subject to a continuous high-voltage square wave pulse instead of a sinusoidal voltage. Compared with a sinusoidal voltage, a high-voltage square wave may apply a higher voltage with a high frequency. The high frequency also intensifies the aging effect of dielectric loss, partial discharge, and space charges on the insulation, which may provoke premature failure. Fatigue and shock play a primary role in traction motor insulation failure. Fatigue is associated with electrical, thermal, and mechanical agi
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