基于顶层油温的变压器绕组热点温度计算改进模型

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?瘟浚氡溲蛊鞫ゲ阌臀旅芮邢喙亍？悸欠窍咝匀茸?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

An improved dynamic model of transformer hotspot temperature based on top oil temperature

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.