Research On Reliability Test Evaluation Of Energy Collector

Energy data collection and supervisory system is used to supervise and control the energy consumption, and it is an important means to realize the sustainable development of energy in China. Electrical energy collector, as a tool for electrical energy data collection in energy data collection and supervisory system, is designed for an electricity supervision and management of users, and it has a wide application and a large number in the field of electricity, so it has an important position. The accurateness of electric energy data acquisition is directly related to the fundamental interests of the electric power enterprises and users, and as a result, the reliability of electrical energy collector not only affects the reliability of energy data acquisition and supervisory system, but also directly influences the users’ satisfaction. Therefore, the State Grid raises claims for the reliability of electrical energy collector, and its average working life should be 76,000 hours, but it did not provide specific evaluation methods. Because the electrical energy collector is a newly developed product, it lacks the field failure data, and it is difficult to use the field failure data to evaluate its reliability. This paper, taking DJGL- PAX532 new-type electrical energy collector as the object, carried out the reliability prediction, FMECA analysis, failure mechanism analysis, studied its reliability accelerated test method, and assessed its reliability.The paper’s main research work is as follows:First of all, it introduced the thesis’ research background and significance, over viewed the research status of the reliability analysis method, reliability test, and test data statistical analysis method, summarized the research current situation of the reliability of electrical energy collector,and on this basis, it put forward the research content of the paper.Secondly, it analyzed the structure and working principle of electrical energy collector,combined with the failure data of similar product components, used the stress method of components to make a reliability prediction for electrical energy collector, and obtained its expected value of average life expectancy. It adopted the way of combining function and hardware FMECA analysis method, determined the failure modes and failure causes of the electrical energy collector and the critical components and weak links affecting the reliability of collector, and laid a solid foundation for the failure mechanism analysis of electrical energy collector.Thirdly, the paper analyzed the influence of temperature, humidity, voltage and current on the failure of critical components of electrical energy collector, revealed that the main failure mechanism of the electrical energy collector was the components’ cumulative damage and aging caused by the temperature stress, and finally led to the short circuit of components and parameter drift, which laid a solid foundation for establishing the accelerated reliability testing method ofelectrical energy collector.Fourthly, according to the failure mode of electrical energy collector, the paper put forward the criterion of the accelerated stress of electrical energy collector, analyzed the limitations that the traditional constant stress, step stress, sequence stress three acceleration test methods were used for the acceleration test of electrical energy collector. Based on the cumulative effect hypothesis, it put forward the cyclical acceleration method whose sub test is step stress test method. On the basis of the exponential distribution of fault time of electrical energy collector,taking the Gamma distribution as a prior distribution, it used multilevel Bayesian no failure data statistical analysis method to obtain the average life span of electrical energy collector calculated with the experimental data. Meanwhile, the paper adopted the Arrhenius equation under temperature stress and activation energy value of electronic products to calculate the average life expectancy of the electrical energy collector under the normal operating temperature, and it satisfies the requirement for 76,000 hours.Finally, it summarized of the research content of the whole paper, and pointed out the content of the further research on the reliability of electrical energy collector.