考虑绝缘剩余寿命的变压器健康状态评估方法

摘要

A method of health condition assessment considering its insulation remaining life is proposed for oil-immersed power transformers,which extends the existing health index theory and the insulation life calculation method to establish the mapping relationship between the result of transformer operating condition assessment and its remaining life.The hot-spot temperature of transformer is calculated according to its load records and environmental temperature data,based on which,its insulation remaining life is calculated.The concept of classification evaluation is applied to evaluate the operating conditions of transformer in different classes,which considers different influencing factors to form the health index correction factors for different classes and calculates the remaining life and health index score to reflect the comprehensive operating condition of transformer.Sample analysis for an actual substation proves the validity and superiority of the proposed method.The method can also be applied to other oil-charged equipments(such as reactor).%在现有的健康指数理论和绝缘寿命计算方法的基础上进行延伸和拓展,建立变压器运行状态评估结果与其剩余寿命的映射关系,提出了一种考虑绝缘剩余寿命的油浸式变压器健康状态评估方法.利用变压器负荷记录和环境温度数据计算设备热点温度,继而计算设备的绝缘剩余寿命;再根据分级评估的思想对变压器运行状态进行分级评估,考虑不同因素的影响,形成不同层级的健康指数修正因子,最终得到反映变压器的综合运行状态的设备剩余寿命及健康指数评分.通过实际变电站算例分析证明了该方法的有效性和优越性.该方法并不局限于油浸式变压器,对于其他油绝缘设备(如电抗器)同样适用.