短路条件下变压器振动特性研究

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。

Research on short-circuit vibration of power transformer

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.