摘要
油浸式电力变压器绕组热点温度是影响变压器绝缘寿命的重要参量,与变压器顶层油温密切相关。考虑非线性热阻-变压器断路阻抗、油粘滞度以及绕组损耗随温度的变化,引入粘滞度与损耗关于温度变化的修正因子,提出一种基于顶层油温的变压器绕组热点温度改进模型。模型参数选用Levenberg-Marquardt算法进行估算。对比实验室温升用试验变压器实测数据,该模型在欠负载(90%)、额定负载(100%)以及过负载(110%)下,显示了较好的一致性,特别在动态负载下,能够较好地描述各暂态温度变化情况,为变压器绕组热点温度计算提出了一种新方法。
The winding hot spot temperature of the oil-immersed power transformer is an important parameter. It has a great influence on the transformer insulation aging and a close relationship with the transformer top oil temperature. The changes of non-linear thermal resistance, open-circuit impedance, and oil viscosity and winding losses with temperature are also taken into account. An improved model added on the transformer top oil temperature to calculate transformer winding hot-spot temperature by using the viscosity and loss correction factors is proposed. Model parameters are estimated by Levenberg-Marquardt method. In the end, by comparing with the measured data tested under different conditions, the model shows good consistency under underload （90%）, rated load （100%） and overload （110%） conditions respectively, and describes the temperature variation more accurately in the dynamic loading profiles.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2012年第5期69-75,共7页
Journal of Chongqing University
基金
国家创新研究群体基金资助项目(51021005)
国家重点基础研究发展计划资助项目(973计划)(2009CB724506)
