When the system has the common cause failures, units of system is not statistical independence, where is the difficulty of system reliability analysis.

It is important to establish the method of system reliability, which is used in engineering for identically distributed components having common cause failures.

This paper,using pure analysis method has,proved the qualitative analysis of a dynamic state nonnegative solution of a 4 unit redundant repairable system with common cause failures.

Study on common mode failure models in power system reliability evaluation;

Based on the parallel principle, and common mode failure had the oil pollution causes, has drawn uphydraulic system s transformation plan, has implemented transformation to that the hydraulic valve and.

Through to Shuozhou area seven mile ditch 220 transformer substation 2# the transformer oil chromatograph track analysis and the DC resistance test,the overall has judged the breakdown reason,introduced the treating processes,and aimed at this example breakdown to propose the related lead wire aspect conclusion.