| The power station bus systems arrangement is the main part of power systems .The reliability of power station bus systems arrangement has great effect to the safe and the economical operation of power systems. In a long time, much research has been done in this field, and a variety of reliability models and methods have been proposed.Firstly, the paper detailedly introduces the definition and the characters of power station bus systems arrangement, the significance of research on reliability of power station bus systems arrangement. With analyzing these methods, the paper discovers that these existent methods and models have not considered the characters of bus systems arrangement, the relativity of components and the isolation after the component failure. By analyzing the characters of bus systems arrangement, it is discovered that the function of bus systems arrangement is carried out by the minimal paths that originating from generators and terminating transmission lines in bus systems arrangement and the component failure will effect the operation of bus systems arrangement by cutting off some minimal paths.According to these ideas, the minimal cut-state based on the state of component has been proposed to evaluate the reliability on power station bus systems arrangement. The reliability model is established by considering the dependency of the refusing action of breaker, the non-random of maintenance on scheduled and the isolation after component failure. The continuityrindices > security indices and adequacy indices will apply to the bus systems arrangement reliability assessment with considering the characters of the power station bus systems arrangement that connecting sources and systems. The paper illustrates the approach in detail by evaluating the reliability of two typical power station bus systems arrangements.At last, the paper elementarily discusses some other characters of the method and some other problems in further research.
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