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Reliable analysis of monitoring power and power interruption controller in underground refuge system

The government enforces the refuge system in coal mine since 2013. The underground refuge monitoring is crucial for coalmine safety. In order to assess the reliability of the underground monitoring power and power interruption controller in the coalmine refuge system, the accelerated life tests under constant stress were presented based on the exponential distribution. Through a comparative analysis of lots of factors, the temperature was chosen as the constant accelerated stress parameter. With regard to the data statistical analysis, the type-I censoring sample method was put forward. The mathematical model of the coal mine monitoring power and power interruption controller were established and the average life expectancy curve was obtained under different temperatures through the analysis of experimental data. The results demonstrated that the mathematical model and the average life expectancy curve were fit for the actual very well. It is concluded that the reliability study of the monitoring power provides an important foundation for the coalmine refuge monitoring system.