Online Estimation of Transformer Hot Spot Temperature by Considering the Effects of Load Profile Modeling

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-10-01 DOI:10.24200/sci.2023.62478.7883

Khadijeh Moosavi, Hossein Mokhtari

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引用次数: 0

Abstract

One of the most valuable components in power systems is power transformer whose failure may result in a significant power loss. Therefore, one of the critical issues in power transformer operation is its health monitoring. Moreover, it was shown that the aging rate of transformers is very sensitive to the hot spot temperature, and when this temperature exceeds a threshold value, the aging rate increases. Given the fact that using temperature sensors in prefabricated and built-in transformers is not practical, thermal models are used to estimate transformer hot spot temperature. Since the transformer hot spot temperature is a key factor in the condition monitoring of a transformer, and in case it will exceed a threshold value, preventive actions should be taken in the proposed algorithm, the sensitivity of this important parameter with respect to the load profile sampling time is investigated. This paper proposes a fast online algorithm for the estimation of power transformer hot spot temperature by reducing the number of calculations without sacrificing accuracy. The proposed algorithm is applied to a 250 MVA transformer using MATLAB software. The results were compared with the actual factory test results and the efficiency of the proposed algorithm was shown.

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考虑负荷剖面建模影响的变压器热点温度在线估计

电力变压器是电力系统中最有价值的部件之一，它的故障可能会导致严重的功率损失。因此，电力变压器的健康监测是电力变压器运行中的关键问题之一。结果表明，变压器的老化速率对热点温度非常敏感，当热点温度超过某一阈值时，变压器的老化速率增大。考虑到在预制和内置变压器中使用温度传感器是不现实的，使用热模型来估计变压器热点温度。由于变压器热点温度是变压器状态监测的关键因素，当热点温度超过某一阈值时，算法中需要采取预防措施，因此研究了这一重要参数对负荷剖面采样时间的敏感性。本文提出了一种快速在线估计电力变压器热点温度的算法，在不牺牲精度的前提下减少了计算次数。利用MATLAB软件将该算法应用于一台250 MVA变压器。结果与实际出厂测试结果进行了比较，证明了所提算法的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.