Characteristics of elastic waves caused by corona discharges in an oil-immersed pole transformer
Characteristics of elastic waves caused by corona discharges in an oil-immersed pole transformer
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油浸杆式变压器电晕放电弹性波特性
DOI：
10.1109/94.919956
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
K. Ando
中科院分区：
文献类型：
--
作者：
T. Sakoda;H. Nieda;K. Ando
利用声发射（AE）技术，对油浸磁极式Transformer和充油模型油箱中模拟电晕放电产生的弹性波进行了测量，以确定绝缘劣化的位置。利用快速傅里叶变换（FFT）对声发射信号进行分析，研究了Transformer中绝缘绕组和变压磁芯对弹性波特性的影响。结果表明，在Transformer油箱壁上检测到的声发射初始信号几乎都是由振荡波通过绝缘纸和绝缘油，经过反复透射、反射和折射而产生的兰姆波。此外，通过FFT分析，可以识别所测量的弹性波是否受到绕组及其绝缘纸的影响。这表明变压器电晕放电的定位精度将得到提高。
Measurements of elastic waves brought by a pulse of simulated corona discharge in an oil immersed pole transformer and a model tank filled with oil were performed in order to identify the location of insulation deterioration, using an acoustic emission (AE) technique. The detected AE signals were analyzed by means of a fast Fourier transform (FFT), and properties of elastic waves influenced by the existence of insulated windings and magnetic core for power transformation in the transformer were investigated. The result shows that almost all the initial AE signals detected on the-wall of the transformer tank were Lamb waves caused by the oscillation waves passing through the insulating paper and oil with repeating transmission, reflection and refraction. Also, it was possible to recognize whether the measured elastic wave was influenced by windings and their insulating papers or not, by FFT analysis. This suggests that the location accuracy of the corona discharge in the transformers would be improved.