考虑绕组欠运行状态的变压器可靠性评估

电力变压器在电力系统中占据着重要位置,变压器的可靠性模型对电网的设计规划与安全运行都有重要影响。文章从变压器的实际运行状态出发,将变压器所处的实际状态分为正常运行状态、绕组降额运行状态、绕组故障状态、计划停运状态等8种,采用分组马尔可夫过程对变压器可靠性模型进行评估。针对变压器实际统计数据,运用频率和持续时间法,建立变压器综合可靠性模型。仿真结果表明方法可靠有效,能够为运行维护人员提供一定的理论参考。

Reliability Assessment Of Power Transformers Considering The Derated State Of Wingdings

The power transformers are very important in the power systems. Reliability modelling of power transformers has a great impact on the design and security of the grid. In this paper, we assess a reliability model of power transformers using different MarKov groups , we divide the power transformers into three parts which are series system, wingding system and maintenance system. In order to get the reliability assessment, We consider the impact on the reliability of power transformer which wingdings working in an derated state make. Then, according to the statistics on reliability indices of power transformers and the changing proportion of windings in derated state, we assess the reliability indices of power transformers combining the steady-state probabilities in transformers and the frequency variation. The simulation shows that the method is valid and reliable which can provide the operator more theory support.