输变电设备状态评价及可靠性研究
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摘要
随着智能电网和数字化变电站的发展,电力设备数量剧增,输变电设备智能化程度提高,原有的定期检修结合事后检修的检修体制已无法满足电网发展的需求。状态检修通过设备状态评价、可靠性分析、风险评估、检修决策等手段来开展检修工作,可以提高检修的针对性和有效性,是一种经济合理、提倡推广的维修方式。其中设备状态评价和可靠性分析是风险评估和检修决策的基础,因此输变电设备状态评价和可靠性分析是状态检修工作开展的基础,对当今电力行业发展具有重要意义。
本文的研究内容主要包括以下三方面：(1)借鉴国家电网公司对一次输变电设备进行状态评价的成果,首先研究了电子式互感器状态评价的层次模型、评价方法及流程,在此基础上,研究电子式互感器的可靠性定量分析计算,为电力企业在设备选择、可靠性评估等方面提供参考依据；(2)从状态检修的需求出发提出基于时间和状态的故障率模型,同时考虑设备在运行过程中的衰退信息和失效信息,在状态故障率模型中引入时间标签,提出以设备健康状态模型为基础,模型参数随时间变化的输变电设备故障率模型改进方案；(3)提出采用全状态集成法来计算改进模型的比例参数和曲率参数,该方法对设备带有时间标签的完整健康过程进行研究,跟踪利用全过程的状态信息,得到带有役龄标记的模型参数。利用上述三方面内容的研究成果分别针对一些算例进行分析和比较,算例结果很好的验证了上述方法的可行性和有效性。
As the development of smart grid and digital substation, the number of power transmission and transformation equipment is increasing dramatically, and the equipment became more intelligent. The traditional maintenance system which is time based maintenance associated with corrective maintenance, has not met the demand of power grid. Condition based maintenance, which works through equipment condition evaluation, reliability analysis, risk assessment and decision-making, is well-directed and effective, and is a kind of economical and reasonable maintenance that worth to be promoted. While equipment condition evaluation and reliability analysis are the basis for is the risk assessment and maintenance decision-making, they are the basic work of condition based maintenance, which is of great importance for today's power industry.
This article studied on the following three parts:(1)The electronic instrument transformer condition evaluation level-model, evaluation methods and processes were studied firstly, by learning from the results of condition evaluation research which was taken by state grid corporation of China on power transmission and transformation equipment. Then the quantitative reliability of electronic instrument transformer was calculated which would be made reference for the enterprise in the equipment selection and reliability analysis; (2)Secondly, the failure rate model which based on time and condition was proposed, that meant both of equipment recession information and failure information should be considered. By introducing a time label, an improvement of condition failure rate model was presented, which considered model parameters changing with time; (3) Lastly, all-state integration (ASI) method was proposed to calculate the proportion parameters and the curvature parameter of improved model. ASI is used to study on an integral health process which is with time tag of each device, and follows condition information of integral process. So model parameters are marked with service age. Some of the examples were analyzed and compared using the research result above-mentioned, and the examples results well verified the feasibility and effectiveness of the method presented above.
本文的研究内容主要包括以下三方面：(1)借鉴国家电网公司对一次输变电设备进行状态评价的成果,首先研究了电子式互感器状态评价的层次模型、评价方法及流程,在此基础上,研究电子式互感器的可靠性定量分析计算,为电力企业在设备选择、可靠性评估等方面提供参考依据；(2)从状态检修的需求出发提出基于时间和状态的故障率模型,同时考虑设备在运行过程中的衰退信息和失效信息,在状态故障率模型中引入时间标签,提出以设备健康状态模型为基础,模型参数随时间变化的输变电设备故障率模型改进方案；(3)提出采用全状态集成法来计算改进模型的比例参数和曲率参数,该方法对设备带有时间标签的完整健康过程进行研究,跟踪利用全过程的状态信息,得到带有役龄标记的模型参数。利用上述三方面内容的研究成果分别针对一些算例进行分析和比较,算例结果很好的验证了上述方法的可行性和有效性。
As the development of smart grid and digital substation, the number of power transmission and transformation equipment is increasing dramatically, and the equipment became more intelligent. The traditional maintenance system which is time based maintenance associated with corrective maintenance, has not met the demand of power grid. Condition based maintenance, which works through equipment condition evaluation, reliability analysis, risk assessment and decision-making, is well-directed and effective, and is a kind of economical and reasonable maintenance that worth to be promoted. While equipment condition evaluation and reliability analysis are the basis for is the risk assessment and maintenance decision-making, they are the basic work of condition based maintenance, which is of great importance for today's power industry.
This article studied on the following three parts:(1)The electronic instrument transformer condition evaluation level-model, evaluation methods and processes were studied firstly, by learning from the results of condition evaluation research which was taken by state grid corporation of China on power transmission and transformation equipment. Then the quantitative reliability of electronic instrument transformer was calculated which would be made reference for the enterprise in the equipment selection and reliability analysis; (2)Secondly, the failure rate model which based on time and condition was proposed, that meant both of equipment recession information and failure information should be considered. By introducing a time label, an improvement of condition failure rate model was presented, which considered model parameters changing with time; (3) Lastly, all-state integration (ASI) method was proposed to calculate the proportion parameters and the curvature parameter of improved model. ASI is used to study on an integral health process which is with time tag of each device, and follows condition information of integral process. So model parameters are marked with service age. Some of the examples were analyzed and compared using the research result above-mentioned, and the examples results well verified the feasibility and effectiveness of the method presented above.
引文
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