摘要
油浸式电力变压器的热特性作为变压器设计制造与运行过程屮的重要参量,是衡量变压器在日常负载以及过负载条件下运行寿命的一个重要指标。为此,提出了一种解析技术与数值分析相结合的热模型计算变压器绕组温度分布,计算中所需的变山器内部热源分布以及边界条件由解析逼近定出。将该模型应用于100kVA/5kV温升用油浸式变压器的各种负载情况,并将计算结果与实验室温升试验的结果进行了对比,结果表明:该模型的最大误差为4.5℃,相对误差小于8.7%,能用于实时计算运行变压器的绕组温度分布。同时应用该模型可为运行变压器的热点定位研究提供新的思路。
The thermal characteristics of oil-immersed transformers, as an important factor for designing, manufacturing,and operating the transformers, are also a major indicator of lifetime of transformer under normal load conditions andoverload conditions. Hence, we proposed an analytical calculation model that combines hybrid thermal model and nu-merical analysis. In this model, the distribution of internal thermal source and the boundary conditions are obtained fromanalytic approximation. We applied the model to a 100 kVA/5 kV transformer prototype under various load conditions,and compared the calculated results with the experimental results. The results show that the model has the maximum er-ror of 4.5℃ and a relative error less than 8.7%, which means it is applicable for calculating the temperature distributionin transformer windings in real time. Meanwhile, applying the model may also lead to a new way for locating hot spots inoperating oil-immersed power transformers.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2014年第10期3164-3170,共7页
High Voltage Engineering
基金
国家群创雄金资助项目(51021005)~~
关键词
电力变压器
热模型
数值分析
边界条件
解析技术
绕组温度分布
power transformer
thermal model
numerical analysis
boundary conditions
analytical calculation
windingtemperature distribution
