短路条件下变压器振动特性研究

作者：洪凯星1,潘再平1*,黄海2 日期：2010-06-28/span> 浏览：3712 查看PDF文档

短路条件下变压器振动特性研究
洪凯星1,潘再平1*,黄海2
（1.浙江大学 电气工程学院,浙江 杭州 310027; 2.浙江大学 仪器科学与工程学系,浙江 杭州 310027）

摘要：利用振动法对运行中的变压器进行诊断是一种新的趋势，但是到目前为止，振动法的效果仍然不够理想。变压器表面振动信号比较复杂，如何得到一个能正确反映实际振动的模型是研究的关键，针对如何简化模型的问题，提出了短路条件下变压器油箱表面的振动模型，该模型基于振动的产生和传递过程。该模型的参数由单相短路实验得到的数据计算得到。利用得到的模型，只需要根据输入电流值即可计算振动估计值。最后，采用三相短路实验验证了模型的正确性。实验结果表明，估计信号和实测信号基本一致，利用简化的绕组模型和传递模型是完全可行的。
关键词：变压器；短路实验；油箱振动；振动模型
中图分类号：TH7；TM76文献标识码：A文章编号：1001-4551(2010)06-0087-04

Research on short-circuit vibration of power transformer

HONG Kai-xing1, PAN Zai-ping1, HUANG-Hai2
（1. College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China;
2. Department of Instrumental Engineering, Zhejiang University, Hangzhou 310027, China）

Abstract: Diagnose transformer using vibration method is a new trend which can monitor without shut apparatus down, but this method is still unsatisfied. The vibration signals from the transformer tank are complicated, and it is important to find a model which can reflect the vibration correctly. Aiming at how to simplify the vibration model, a transformer tank vibration model under short-circuit condition was presented. The model was based on how signal generates and how signal transmits. The model was obtained using data set sampled in single phase short-circuit tests. With the fully trained model, the estimated vibration signal at one point was calculated by employing the input current only. In order to validate the model, three phase short-circuit tests were taken. The results show a good agreement between estimated signals and measured signals, the results indicate that it is feasible to use a simplified windings and transmission model.
Key words: transformer; short circuit test; tank vibration; vibration model