Improved Method for Calculation of Hot-spot Temperature in Power Transformer

CHEN Wei-gen; ZHAO Tao; JIANG Tao-sha; SUN Cai-xin

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Improved Method for Calculation of Hot-spot Temperature in Power Transformer

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- Improved Method for Calculation of Hot-spot Temperature in Power Transformer
- High VoltageApparatus Vol. 45, Issue 1, Pages: 53-56(2009)
- 作者机构：
  
  重庆大学电气工程学院高电压与电工新技术教育部重点实验室
- 作者简介：
- 基金信息：
- DOI：
  CLC： TM406
- Published：2009
- 稿件说明：
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[1]陈伟根,赵涛,江淘莎,孙才新.改进的变压器绕组热点温度估算方法[J].高压电器,2009,45(01):53-56.

CHEN Wei-gen, ZHAO Tao, JIANG Tao-sha, et al. Improved Method for Calculation of Hot-spot Temperature in Power Transformer[J]. High voltageapparatus, 2009, 45(1): 53-56.
[1]陈伟根,赵涛,江淘莎,孙才新.改进的变压器绕组热点温度估算方法[J].高压电器,2009,45(01):53-56. DOI：

CHEN Wei-gen, ZHAO Tao, JIANG Tao-sha, et al. Improved Method for Calculation of Hot-spot Temperature in Power Transformer[J]. High voltageapparatus, 2009, 45(1): 53-56. DOI：

摘要

根据变压器铁心和绕组的发热过程

详细分析了变压器铁心损耗和负载损耗的组成以及其对变压器顶层油温和热点温度的影响

从实际物理意义的角度详细解释了GB/T 15164-1994《油浸式电力变压器负载导则》推荐的绕组热点温度计算方程各参数项的含义。在此基础上

对推荐方程中的绕组指数和油指数项进行了调整和修改

使其对应的物理意义更加合理。文章最后比较了负载导则中推荐方程和改进方程的计算结果

二者反映的热点温度变化趋势相近

计算结果相差较小

改进方程在安全性方面显示出更高的可靠性。

Abstract

According to the thermal process of transformer core and winding

this paper analyzes the compositions of core loss and load loss and their impacts on top oil temperature and hot-spot temperature of a transformer

and discusses the physical meanings of the parameters of the hot-spot temperature calculation equation recommended in the standard GB/T 15164-1994（loading guide for oil-immersed power transformers）.Moreover

the winding temperature exponent and oil temperature exponent of the recommended equation are corrected so that the physical significances corresponding to those items are more reasonable.The comparison results between the recommended equation and the improved equation indicate that the hot-spot temperature trends to being similar with small difference

and the improved equation shows higher reliability in security.

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