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Shi J.,Suzhou Nuclear Power Institution Co. | Zeng Q.,Daya Bay Nuclear Power Operations and Management Co.
Advanced Materials Research | Year: 2012

The Ageing mechanisms of electromagnetic relay were discussed. And the key ageing indicators were found out. Then, the test methods of ageing indicators were introduced. After that, a method to evaluate the lifetime for the coil of electromagnetic relay was proposed. Accelerated ageing test was conducted to the coils, and the key ageing indicators were collected periodically. According to those test data, the ageing condition and lifetime were evaluated. In the end of the paper, examples about assessing the ageing condition and lifetime were given separately. © (2012) Trans Tech Publications, Switzerland. Source


Shi J.,Suzhou Nuclear Power Institution Co.
Hedongli Gongcheng/Nuclear Power Engineering | Year: 2010

The preventive replacement method based on the experimental feedback was introduced. In this method, the initial preventive replacement cycle was acquired by expert votes. The preventive replacement cycle combined with the operation experience of the equipment was gained by means of Bayesian theorem. The Optimized preventive replacement cycle can be acquired by comparing the two probabilities that no fault occurs within the cycle. This method was tested on the switches which were used in Daya Bay Nuclear Power Plant and the results indicated its validity. Source


Shi J.,Suzhou Nuclear Power Institution Co.
Hedongli Gongcheng/Nuclear Power Engineering | Year: 2010

An approach to determine the preventive maintenance cycle was proposed in consideration of the lifetime, optimal cost and economy. Two parameters Weibull distribution was used to calculate the lifetime of contact switch. The block replacement model and age replacement model were built with the objective of optimal cost, and the preventive replacement cycle was accounted. Eight proposals for preventive replacement cycle were given. Economy model was applied to assess those proposals and the optimal proposal was confirmed. Source


Yang J.,Suzhou Nuclear Power Institution Co. | Sun Y.,Donghua University | Xu Y.,Donghua University
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2015

Both numerical and regression models taking three basic micro-climate variables into consideration were proposed to analyze the impact of micro-climate on maximum power outputs of single-crystalline silicon PV array. The root mean square error between the results of numerical calculation and the experiment data was 0.231%, while the mean deviation was 0.018%. As for the regression model, the root mean square error between the regression predicted values and the experiment data was 0.171%, and the mean deviation was -0.006%. Furthermore, the main difference of the numerical model under both high external ambient temperature and strong solar irradiance was eliminated. The model results show that there is a similarly parabolic dependence of the maximum-power outputs of single-crystalline silicon PV array on the ambient temperature, and the increasing speed in the morning is faster than the decreasing speed in the afternoon. The maximum-power outputs of single-crystalline silicon PV array depend linearly on the solar radiation flux on PV panels. Lastly, there is an exponential dependence between the maximum-power outputs of single crystalline silicon PV array and the wind speed whose index is a linear function of wind speed. ©, 2015, Taiyangneng Xuebao/Acta Energiae Solaris Sinica. All right reserved. Source


Shi J.,Suzhou Nuclear Power Institution Co. | Tang S.Y.,Nuclear Power Qinshan Co.
Applied Mechanics and Materials | Year: 2013

In the accelerated ageing test of fuses, manual measurement was used to collect the temperature of fuse. By this testing method, the errors introduced by human were inevitable. In this paper, an automatic temperature measuring type accelerated ageing test system for fuses was developed. So, the errors introduced by human were overcome. © (2013) Trans Tech Publications, Switzerland. Source

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